Question about 2004 Volkswagen Passat
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Posted on Jan 02, 2017
You should never connect a 12volt to the compressor solenoid.unless you unplug it first, because on some cars the ac solenoid is driven by an electronic circuit. Semiconductors are very sensitive to excessive current. I once had to repair the computer on a mercedes because the other mechanic did that. Luckily I know how to repair electronic circuits, or they would have bought a 500 dollars computer the little chip that blew only costed a dollar fifty cents at radio shack,.LOL. Anyways back to your problem, Have you checked if there is a leak, and all the refrigerant might have leaked out? This would prevent the compressor from coming on. Along the ac line there is a switch, sometimes by the reciever drier, when the system looses refrigerant the pressure inside drops and that pressure switch disable the compressor. , and the compressor wont come on. This is to protect the compressor, because it will be damaged if you run it without refrigerant. Ac clutch solenoid is usually is not driven by relay, because an ac solenoid don't really take much current to to kick in, unless of course it is shorted. It would either be directly from the inside switch usually in series with the fan control or driven by a small transistor in a circuit, and the electronic circuit is driven by the ac controls inside. I think the problem with your ac is that it has no refrigerant thats why the compressor wont come on.
Posted on Jun 27, 2009
the a/c pressure switch is located to the left side of the condenser radiator, as you stand in front of the vehicle. you may have to remove the bumper in order to get access to this switch.
there are 2 relays dealing with the a/c , numbers 16 and 17, on the relay plate at the drivers knees, the plastic panel will have to come down. 16 is the clutch relay and 17 is a/c control module.
hope this is of some help
Posted on Jul 29, 2010
SOURCE: Where is the AC Compressor
YOU HAVE TO REMOVE THE SPLASH SHIELD FROM BELOW THE ENGINE.AND PLACE THE RADIATOR SUPPORT PANEL IN THE SERVICE POSITION REMOVE POWER STEERING OIL COO;ER LINE FROM RADIATOR.YOU HAVE TO REMOVE THESE PARTS BEFORE YOU CAN GET TO THE COMPRESSOR BY LAW AND SAFETY.FIRST TAKE CAR TO DEALERSIP TO REMOVE ALL REFRIGERANT FROM AC SYSTEM BE REMOVING ANY COMPONENTS.
Posted on Jul 29, 2010
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