There are a lot of sensors switches and a couple of relays that could be the problem. First are your cooling fans running
The cooling fans cycle on and off during normal driving with the AC compressor off but do not turn on when the compressor has been switched on. I tried this after the car was up to normal operating temperature and after I saw the fans cycle a few times.
Quote Originally Posted by sharrer AC compressor does not run in 98 beetle automatic. Fuses are good but I have not tracked down the other permissives that allow the ac compressor to run . Are there any common failures for this year and model such as switches or relays Try checking your cooling fans. Mine got nasty wirings & some busted relays & some sensors screwed up.
NO leaks actually the coolings fans turn off when she switched the ac off so therfore the car gets hot and the dummy light comes on Would that be the switch loctaed under the battery(fan controller switch)
Check for trouble codes first. Also make sure the cooling fans are operating. Have you checked the AC pressures on the high and low side