mercedes benz class c air conditioning condenser

Answers and questions: mercedes benz class c air conditioning condenser

MERCEDES BENZ CLASS M W164 Need procedure for cleaning air conditioning system

I left my ML350 sit outside in the south during the summer and when i returned the air conditioning smells for the first few seconds of being on the MB dealer said they have a service bulletin on how to clean the mold from the system so that this humidity-caused problem goes away anyone know how to do it thanks

I dont know how mercedes recommends to kill the mold. Anyway I dont think any treatment is 100% successful. BMW has a sort of steamer that sits in the car for a couple of hours and puffs out some kind of disinfectant while the AC is left running. My friend who owns a BMW dealership says it doesnt really work but it makes customers feel happier. I mix some Dettol (hospital disinfectant sold in most

MERCEDES BENZ CLASS S IV 220 Some advice from me on air conditioning

Just thought I would pass on some knowledge gained by a complete novice with auto air conditioning The dreaded red light came on the EC button on my air conditioning and after researching on this site I found the way to reset the fault - but the light came on again after two minutes (thus only blowing warm air). This forum showed me this was the system automatically shutting down to protect the pump

If your in the UK. Go to some where like Kwik Fit. They have an automated machine which will re-gas your air con. If there is a problem no charge. You should get it done for 30 to 50 GBP. Haggle Its worth having it done every year you will also know how much gas has been lost. If you have AC problems then its time to look at the AC companies or mercedes or you can change things like condensers yourself its not rocket science.... and save some money.

View Air conditioning condenser for MERCEDES BENZ CLASS C

MERCEDES BENZ CLASS M W163 Air Conditioning emits foul odor

My 98 ML 320 has started to emit some pretty sour odors from the air conditioning vents when started up after parking overnight. I recall reading that the system has a replaceable filter element but I cannot spot it. Anyone else have this experience and what did you do about it - is a owner serviceable replacement Thanks br

My 99 has had the same problem for almost 2 years. My dealer has replaced the filter several times but the smell comes back. They replaced the heater core and that did not fix it. Im bringing it back in next week and they are going to try again. condenser and the reciever dryer are suspect. They claim mercedes is no help with this problem. We need to find out if other people have had this problem sucessfully repaired. My dealer in Colorado is lost.............

I know it has been a while but did anyone find a solution to this problem My 99 ML320 has a foul odor associated with the air conditioner. Ive replaced the cabin air filter which didnt help and sprayed Lysol into the intake which helped a little but Id like a more permanent solution. I suspect it may have something to do with either the condenser or condenser drain tube but I dont want to start pulling that stuff apart until Im sure I can fix it. Thanks

I should have said evaporator rather than condenser in the previous post

Quote Originally Posted by BajaCat I know it has been a while but did anyone find a solution to this problem My 99 ML320 has a foul odor associated with the air conditioner. Ive replaced the cabin air filter which didnt help and sprayed Lysol into the intake which helped a little but Id like a more permanent solution. I suspect it may have something to do with either the condenser or condenser drain

MERCEDES BENZ CLASS M W163 99 ml320 air conditioning stopped working

Howdy All I read through the AC issues with the search function. My fuses are good (30amp 44) and my wife complained of a sound and rough idle then no AC. The compressor nor the fans are turning on with the AC button pushed. Will these not function properly if it is low on 134a Thank you Chas

If the compressor failed and you are looking at the redo acutally the parts set is not as damaging as you might think. Compressor new Behr China compressor is a bargain at the price for like 245 which some internet parts houses sell for like 385 under their private brands. OE dier should be 40 OE expansion valve like 40 o-ring kit like 8 the whole sheabng for like 340. 1996 - 2008 Chrysler Dodge mercedes

MERCEDES BENZ CLASS S I 126 300SE Air Conditioning Cuts Off

How I got here is a long story in short local AC shop said my compressor and condenser were leaking quite badly and when I had access to some specialty equipment I decided to undertake replacing the compressor condenser and receiver-drier (and the two associated pressure switches). The car had been converted to R134a and I hated how it drove with it on. It sapped a lot of power from the engine and

MERCEDES BENZ CLASS E III 211 Air Conditioning Flashing Red Light

I have a 03 E320 Sport and my air Cond. just stopped working. When I press the AC button the light flashes red instead of turning green. Any idea what the problem is

Quote Originally Posted by no clue Sorry I am not good w cars. I will just post whatever they do from my bill. OPCODE 831534 79 831780 42 837970 70 831762 112 541011 42 Parts are 1 203-830-04-72 77 22 Q-4-83-0190 26.84 Total 448.84 Funny things is ...I really have no idea exactly what they charge me. ( yes there is decription but I just dont get them at all. Here is what they type on the description

MERCEDES BENZ CLASS M W163 WHERE DID MY AIR CONDITIONING GO

It has been extremely hot in the Northeast this past summer and the ML55 has performed well in terms of keeping me cool. However recently we had a cold spell lasting from one evening to the other and I turned off the ac. The following day the weather got hot and I jumped into the car started it and turned on the ac. The blower turned on and the HVAC system functioned perfectly but no cold air. I have

vvr it sounds like one of your hvac door flaps is not functioning. Try switching to full heat (not the temp control the air outlet control) and different vent positions (like defrost) to actuate all the flaps then go back to AC to see what happens. Try full defrost with full low temp setting to see if you get cold air out of the defrost vents. The motors that drive these flaps are known problem areas.

MERCEDES BENZ CLASS G Air Conditioning Problems

Follow up on an old thread. I have a 2000 G500. The AC recently started acting intermittantly. Several people suggested low freon. Below is what we have eliminated Low Freon Compressor Compressor Clutch The clutch is not getting power. The car has been at the MB dealer for a week. The Saab dealer (Europa) is not forthcoming with wiring diagrams. Any ideas on problem spots Thanks Bill

Quote discap - 7252005 659 PM Follow up on an old thread. I have a 2000 G500. The AC recently started acting intermittantly. Several people suggested low freon. Below is what we have eliminated Low Freon Compressor Compressor Clutch The clutch is not getting power. The car has been at the MB dealer for a week. The Saab dealer (Europa) is not forthcoming with wiring diagrams. Any ideas on problem spots

MERCEDES BENZ CLASS M W163 Air Conditioning Advice

Okay here it goes. My AC has not been working for some time but the Compressor and condenser are just fine. Keyes European (A surprisingly good Dealership Auto shop) took a look and concluded that I needed both a new fuse box and controller. They were supposed to send me the part numbers but have not yet. They want 1500 installed. Any wisdom What do you guys think Im comfortable with this car I can

MERCEDES BENZ CLASS V 6382 Vito 639 Air conditioning compressor issues

Hi I have a Vito 2006 model in Australia and now its the 5th time that my ac compressor has blown on me. My auto electrician who has worked on many of these cars with the same problem cant seem to find what the issue is. We are all confused and scratching our heads. Basically I have had the compressor changed condenser changed and the whole ac flushed out and checked. We have also put a universal thermostat

MERCEDES BENZ CLASS S 108 109 air conditioning

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I am a ase certified Tech Located in SW mo.I use 134 freon & pag oil Also you may want to up grade the condenser & cooling fan since 134 runs at a higher head pressure. I ve goy ways to make it blow snow flakes in july Larry

MERCEDES BENZ CLASS B I 245 Air Con not working

I have had a air con top up twice in the last 12 months and now it has stopped working againthe last time they put a dye in but when I took it back they still can not find a leakanybody know of a good air con man in or around Preston Lancs in the UK.

Quote Originally Posted by satking Just ordered a UV Light to have a full investigationthe only way to do it proper is to do it myselfwhen you say to take a photo of the condenser to get the correct one what am I looking for is it sizepipes or mounting brackets. See below. Car air conditioning Parts Compressors condensers Radiators Pumps Free Delivery Mine was the top 1 where the brackets are on both

MERCEDES BENZ CLASS E II 210 AC Condenser Replacement

My air conditioning condenser has sprung about four or five leaks and requires replacement. I removed the brakets fan assembly and horn and can see there is an AC hose fitting to the condenser on the drivers side behind the bumper. I am unsure how to get at the fitting to remove the condenser. Has anyone done a condenser replacement and have a suggestion. Job looks pretty straight forward. Thanks for your help in advance

MERCEDES BENZ 124 124 Major Air Conditioning Problems

Howdy all I need a little help here during a series of unfortunate events I had my air conditioner condenser get busted (as marked in picture below) Anyways my questions are this anybody know if a 1993 300E would be r12 OR r134A Im hoping its r134A so I can just get a new condensor put in and get the sytem recharged. Any thoughts Also my aux fan temp sensor is shot are these difficult to replace Mine

Refrigerant type can be determined from the chargingpressure ports. R12 uses schraeder valve similar to tire valves. R134 uses quick-connect ports similar to air-hose quick-connects. This is assuming your system is original and nobody did any conversion without the proper adapters. A proper repair for your ac would include 1. repair of the problem 2. replacement of the receiverdryer 3. replacement

MERCEDES BENZ CLASS C III 204 Intermittent Check Engine light AC not blowing cold air

Aloha I have a 2008 C300 Sport. I am currently experiencing an intermittent check engine light and an AC that is not blowing cold air. The check engine light has been intermittent for about a month. After I check the gas cap it will extinguish after awhile. The problem is that it comes back on after a few days of driving. The AC is really a mystery. The system is still blowing air (albeit not cold).

Ive had a series of air conditioning issues on my 2008 C-300. IF you are experiencing that the ac blows cold for a while then you hear the electric blower for the radiator rev up at about the same time you lose your ac cooling then its probably the ac condenser. That was about a 1500 repair. What clogged up the condenser was a previous ac repair where they replaced the dryer bag. Bag broke and particles

MERCEDES BENZ SLK R170 98 slk 230 air conditioning stopped working

Last year when I bought this car in Las Vegas I drove it in 115F temperature to San Francisco with the air conditioning running just fine. This year when the weather got hot and I turned it on I got no cold air. I took it in to a dealer on one of their 199 spring specials thinking that a recharge would do the trick..NOT they gave me an estimate of 2400 wanting to replace just about everything compressor

I thought mine needed a recharge well took it to the local repair shop asked if they did work on benz they said yes... Recharged it put a color die in it and well found a leak on the condenser oring fixed it now enjoying ice cold air cost was two hr of labor and a pound of r134a and the new oring 184.95

MERCEDES BENZ CLK I 208 Max cold Air conditioning tips

Hi Guys I know theres many posts on the airconditioning units but I wanted to ask what is the best way to get the coolest air in your car. Should you have the blower on full or should you have the blower on a medium flow to get the coolest air. Also if you use the re-circulation button does this make the air cooler then without Many thanks

Assuming all the damn sensors are working and clean and you have a ac system that is charged properly - heres a couple of things. If its really hot - over 95 the system no matter what setting seems to take a little longer than say a brand new MB simply because the newer cars take advantage of the super high setting of the cooling fan - not the 2nd speed that ours uses. Noticed this on my S550 and BMW

Quote Originally Posted by stim141 To keep the system maintained - deep clean the condenserradiator. It does make a difference. I also have had my evaporator cleaned - amazing what crap gets in the coil and clogs the airflow. Where is the evaporator located Where exactly in the car

MERCEDES BENZ SLK R170 Air conditioning not blowing cold air

Hello I have a 2000 Slk-230. Recently the car has been blowing warm then cold air. It will blow warm air for a while then the fans gear up and it starts to blow cold air. Is there a problem with my air conditioner

I thought I needed re-gassing but soon found I had a leak in my condenser. I had a new condenser fitted and have been re-gassed and my air con is to die for. Interestingly I can have the EC light off and the air con on ice cold one side and if you adjust the temp dial to hot I can have hot out the other side at the same time which is great when the missus says the car is too cold.........

My 1997 SLK 230 Kompressor stopped blowing cold and a local garage inspection discovered a hole in the condenser either corrosion or a stone impact. They drained the fluid and said a new one was required. Does anyone know if a condendenser is easily replacedrepaired and is there a problem running meantime without fluid I priced a replacement online as between 83 to 110. Are there any other implications Thanks

MERCEDES BENZ CLASS M W163 ML 270 Air Con Not Blowing Cold... Ideas

Hi guys I am posting on here out of sheer desperation having read almost every thread on air con for the ML series and there is no situation that appears to meet mine exactly. Therefore I would appreciate any help and advice with my 2003 ML 270 CDI air Con problem. Around 1 week ago I was driving along with my air con whirring and suddenly CRUNCH.... i heard a loud noise from under the bonnet and smoke

Baz Sorry to hear of your misfortune. My advice is to locate a air-conditioning specialist. They will know what the pressure side (small hose) and suction side (large hose) system pressure should be. These readings are important in isolating component issues. My experience with after market compressor is that they will not warrant the part unless you replace the receiverdryer too. It is not impossible

MERCEDES BENZ CLASS M W163 Condenser cooling fans 99 320

When are the condenser cooling fans meant to run all the time the air con is on or when the temperature is high. Thanks Lynall

The cooling fans are meant to supliment airflow in the engine comartment when idleing at low rpms and standing still. Congratulations You must be a genius Maybe it never gets warm in Michigan. You must either never slow down or have low expectations for air conditioning to make a suggestion like that. Maybe it never gets warm in Michigan. If MB could have gotten away with eliminating the fans don™t

MERCEDES BENZ 190 W201 Air Conditioning Relays --- SOS

Does anybody know where the location of the relay that controls the airconditioning system and the Auxillary Fans I took my 93 2.6 190e to get recharged with freon and the guys said that my compressor is not engaging plus the fan is perpetually on. It could be the relay.

Quote Originally Posted by The Melmaan I still cannot locate the relay for the aircon. will for the switch on the left side of the car. Be sure to check the pressure switches on the DrierReceiver first. The switch for the compressor opens if the freon is low so youll need to short the connector to see if the compressor comes on. The other switch is for the aux. fans. It closes when the pressure increases

Quote Originally Posted by slk230red Be sure to check the pressure switches on the DrierReceiver first. The switch for the compressor opens if the freon is low so youll need to short the connector to see if the compressor comes on. The other switch is for the aux. fans. It closes when the pressure increases so the aux. fans turn on to cool down the condenser. Then if you suspect the Klima relay it

MERCEDES BENZ SL 107 1984 380SL air conditioning

I noticed today that when my AC is on and when I come to a stop that water drips on both floormats directly under the dash CAn somebody assist me with this

Quote Originally Posted by Ears usually it is fungus or mold or similar. The air also breaks it up and if it is dissolved or disseminated enough itll drain out with the water. Kinda like a sludge. Usually a build up of damp dust from the dust that gathers on the condenser coil and eventually gets washed down with condensate. It accumulates and agglomerates ergo stopping up the tube. You just cant argue with a word like agglomerates. Its almost like the word fraught but even awesomer.

So how does the fungus or mold or sludge or dust or whatever else may or may not accrete on the AC condenser coil manage to emigrate en masse all the way to the AC evaporator box

Quote Originally Posted by isthisdave So how does the fungus or mold or sludge or dust or whatever else may or may not accrete on the AC condenser coil manage to emigrate en masse all the way to the AC evaporator box Oops... Good Catch. EVAPORATOR COIL (I stand corrected).

MERCEDES BENZ 190 W201 Air conditioning survey

Ive done a lot of reading about ac systems in the W201s Ive concluded that the ac in these cars is not stellar in reliability--mostly related problems with the compressor. What has your experience been with the ac in these cars Have you retrofitted to 134a Do you still have a charge of R12 after all these years My experience is that the climate control system is superb for heating--no problems there.

Quote Originally Posted by msarles1 i just converted mine to 134 but you have to remember that r-12 does not produce the high head pressures of r134 therefore your aux electric fans need to both be running at high speed all the time for the 134 to cool properly when you convert you only install 85% 134 of the total r12 charge mine cools extremly well for 134 now 134 is good and cheap for old leaking

MERCEDES BENZ CLK I 208 R134 Air conditioning re-charge advice needed.

I have read through many old post on re-charging the aircon gas but I am still struggleing to know if I need to extinguish the old gas first or can I just by a DIY gas from (Halfords I live in the UK) and top up the AC system I am going to clean out the duo-valve as there is a good DIY post on here that Ive seen but I still have questions The questions are Is it deffinately R134 gas type I need for my CLK 2000 model Has anyone got any photos of under the hood showing where to connect

Quote Originally Posted by A1EK I have read through many old post on re-charging the aircon gas but I am still struggleing to know if I need to extinguish the old gas first or can I just by a DIY gas from (Halfords I live in the UK) and top up the AC system I am going to clean out the duo-valve as there is a good DIY post on here that Ive seen but I still have questions The questions are Is it deffinately

MERCEDES BENZ CLASS C I 202 Behr vs Nissens AC Condenser

Ive discovered that my 1996 C220 AC isnt working because of a fatal hole in the AC condenser. I found replacement ones but Im not familiar with the Brands so am looking for opinions as to which is superior or if there is a material difference. Also wondering if there is another brand I should consider. The choices are Behr and Nissens. It looks from the part number that the Behr may be OE but that

BTW if the system has been sitting open for a while I would change the drier again. This might help explain it Quote WHAT DOES A DRIER DO- DRY ITS NOT THE FREON Its the oil in the refrigerant that absorbs moisture and holds debris in the system. Replacing the drier accumulator in addition to evacuation will assure better performance. Why Replace the Receiver-Drier The receiver-drier must be changed

MERCEDES BENZ 190 W201 Air conditioning how to refill r134 where R the plugs

hi guys Summer is here (sucks) I have a 1989 190e 2.6 I checked under my hood and it says it was converted to r134 but now there is no cold air. first how the heck do you check if the compressor is running second where is the Low and High valves located to refill the R134 also is this normal shouldnt refrigerant lasts almost a lifetime (might be wrong) if so then that means i have a leak somewhere eh so is there something to seal the leaks etc. thnx

these cars are about 17 -25 years old there are bound to be leaks there are usually slow leaks caused by bad o rings at the line fittings and the such also there may be a pin hole leak or 2 at the condenser or evap. my volvo has worn rings somewhere and it loses charge aftera while it hasnt been running i end up charging at the beginning of summeer and im good for a season.

MERCEDES BENZ 124 124 The dealer fixed my air conditioning I hope.

It will be fixed on Monday I hope they found all that needs to be repaired. Well the dealer found bubbles in my R134 coolant and they told me I need a new expansion valve and a new receiver dryer. The cost is going to be about 600. I told the dealer representative that I was glad they found the problem and I was glad it wasnĂ‚„t the evaporator. He quickly chimed in that he thinks of an older air conditioning

Ksing a few things in your post dont make sense to me. To put it bluntly whoever told you its good to vacuum and recharge the system every three years is off his rocker. The ac system is a closed system and is best left alone until it needs repair. A properly manufactured (or repaired) system should have no moisture in it. Except for cleaning the condenser and evaporator (if you can get at it) and

MERCEDES BENZ 124 124 1995 W124 Air Conditioning Problem

W124 air conditioning problems wife™s 1995 E-320. I have replaced the expansion valve due to leak system fully charged cools only to about 80 degrees. System low side pressure seems high about 60 where experience would suggest 30 high side pressure low 225 instead of around 300 but otherwise appears normal no bubbles in sight glass auxiliary fans working dashboard climate control functions OK. The

Mine works well at 25-30 psi on the low-side . I agree with your ideas maybe the compressor is going. I was thinking over charged but your high side should be higher. Perhaps jump the clutch to run steady and watch your pressures to get a max to see what the compressor can do. Keep a water hose ready to cool the condenser .

MERCEDES BENZ SL 107 Air Conditioning leak ()......

I turned on my AC for the first time the other day ( I just got the car a couple weeks ago) and it worked great hopped on the freeway and drove about 3 miles got off and drove and additional 3 miles on city streets. Right before I pulled into the place I was going I felt a little bit of liquid (water) drip on my (accelerator) foot. I turned the AC off and have had no drips since. Anyone have any idea what this could be

Quote Originally Posted by DrexlerMcStyles I turned on my AC for the first time the other day ( I just got the car a couple weeks ago) and it worked great hopped on the freeway and drove about 3 miles got off and drove and additional 3 miles on city streets. Right before I pulled into the place I was going I felt a little bit of liquid (water) drip on my (accelerator) foot. I turned the AC off and

MERCEDES BENZ SLK R170 Smelly air conditioning

Hi I obtained a can of air conditioning anti bacterial spray today and got rid of the smell where the air con evaporator stays damp. I removed the cover under the passenger footwell and then removed the pollen filter so as the spray did not just get caught in the filter. I then removed the cover from the fan unit and ran it at full speed spraying the anti bacterial spray through the fan which in turn

One common problem with AC units is that the drain line for the ACs condenser is plugged up.

MERCEDES BENZ 124 124 1991 300E Air Conditioning.....

I saw this somewhere and Have run a billion searches and cant find it. My AC Needs a recharge. according to a mechanic the system holds pressue so all it SHOULD need is a recharge. BUT I need R-12. Screw doing a conversion. LOL. Also as I am not an AC specialist when the system is empty will the compressor engage IS there a way to verify the compressor is not siezed. (I mean beside attempting to trun

I remember the MB system ran a few pounds higher all the way around. I keep a garden hose handy to cool the condenser back to a normal pressure on hot days while charging . httpwww.ackits.comindex.cfmfuseactionChart

MERCEDES BENZ 124 124 Ideas about air conditioning problem

I am still a little afraid that I may have the dreaded and expensive air conditioning failure noted for these cars. Last year in June the air conditioning was recharged and filled with the fluorescent indicator dye. Then in the fall I thought the system was fading but with the cooler weather coming I just thought I wouldnĂ‚„t worry about it until the spring. Sure enough it isnĂ‚„t very cold this year.

OK I have a 1987 300D Turbo AC doesnt work. I have no clue whats wrong with it (yeah thats very helpful to anyone trying to help [)]). Ive been told that the condenser is the faulty item. Is there anyway i can find out without visiting a mechanic Thanks in advanced

ksing what vent temperatures are you getting Is the compressor cycling normally You also mentioned there was fluorescent dye in the system. May I assume no leaks were found I know its hard to judge ac performance with the cold spring weve been having. Jason the only way to begin assessing the condition of your ac is to connect manifold gauges to measure the pressures - static and operating. How did somebody figure that your condenser is faulty

My car was sold to me by a mechanic. He had to perform repairs on the car because its been in a accident. Either he knows that the condenser was hit and broken or he found out otherwise. Other than that I wouldnt know whats wrong with it.

MERCEDES BENZ 190 W201 Air Conditioning Problem

So I live in Cali and Ive had a broken air conditioning system for the past 2 summers and I dont think I can stand another summer of 103 degree weather. I have a 1985 190E and Ive taken the car to a well respected mercedes mechanic Silver Star Motors they said they could fix it but it would be too labor intensive and wouldnt be worth it for the price of the fix. I now need to try and fix it myself.

The Haynes manual does not cover this topic. What I know of this issue is that it is a big time repair job involving removing the radiator and then the ac compressor the dryer and probably your evaporator and condenser. One way to do it is to go to Craigs list in your area and find an independent mechanic who will come to your place to do the work and you buy the parts. Unless you have the strength

For your well-respected mechanic to determine that the repair will be labour-intensive heshe must know what is wrong The most labour-intensive replacement will be the evaporator which is behind the dash. Most other components are under the hood. If diagnosis has been done see what needs to be replaced. Get a shop to recover any freon that is still in the system. Replace the defective components yourself

MERCEDES BENZ 124 124 87 300E Air conditioning problems

For the past two summers my ac has not been working and I am tired of driving in the hot air (gets pretty hot in the central CA valley). The blower works but the temp of the air is the same as outside. Having never worked on the ac before what are the things I should check first to see if it is an easy fix The car has never been converted to R-134. Any and all help is appreciated

Converted (from R12 to R134a) AC systems simply are not as efficient. Depending on ambient conditions you may not be able to do much about it other than retrofitting to R12 at greater expense. The R134a factory equipped W124s came with larger compressors dual aux fans and larger condenser to make up for the lack of efficiency.

MERCEDES BENZ SL 107 560SL Air ConditioningCompressor rebuild

This is my first foray into any automotive AC repair so I thought I would document my experience. When I got the car I was told there is something wrong with the AC. The auto temp control system seems to be working fine I just could not get the AC compressor to come on. I read that the freon pressure must be correct before the clutch will turn on. Rather than spend the money to have it diagnosed I

R107s ended production in 1989 and R134 was made mandatory in 1993. Some manufactures saw it coming and beefed up the ac systems in theirs cars. Unfortunately this was not the case with ours as production ended way before R134 became standard. Im not going to go into the benefits of R12 vs R134 as its been talked to death already you can still buy R12 on eBay as its still legal to sell existing stock

MERCEDES BENZ CLASS S I 126 how to Troubleshootfix the AC

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MERCEDES BENZ CLASS E II 210 hissinghowling from heat system

Posted this on mbworld.com no one really had any ideas. I noticed that when the heat is on it makes a hissing sound. more annoying when i accelerate from low speeds it actually groans as if its in unison with the transmission - more groaning with more throttle until i get to a certain speed like on the highway. then i still get hissing. this isnt AC this is heat though the auto button is what i press

more freon and dye earlier this year but when i took it back to the shop a bit later no dye had leaked so they couldnt find the source of the issue. is adding refrigerant to the system the same thing as what they did or something different lastly how do i run the diagnostic how is this done exactly Thanks Frank In reverse order the sticky links you to this site air conditioning Diagnosis Eclassbenz.com

MERCEDES BENZ CLASS E II 210 Aux Fans and Fan Conrtol module

I am hoping everyone can help me here. My Aux fans were not working and in my troubleshooting I thought I had isolated it to the fan motors. Well I replaced the fan and still no joy. Int trying to troubleshoot more I put the car in the fan test mode (hold Auto for more than 10 secs and the aux fan turns on). With no luck. However being puzzled I spun the fan while still in test mode and the fan started spinning. Has anyone seen this and could this be the control module Thanks.

I have a 98 E320 and had the exact same problem. With the fans in full test mode they spun very slowly and at times didnt run at all until I pushed them with my finger. I found a fan control module on eBay for 70 and am awaiting its delivery. Once I install it I will let you know whether it was the fan control module that was making the fans spin so slowly. Also my mercedes dealer is EXTREMELY helpful

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