Air Conditioner Not Functioning

[Ana Marena]

Hello, anyone have any thoughts on this? I did have the freon (or whatever they use now) checked, and the pressure is full. The mechanic didn't have any idea why it wouldn't work. Someone I know said perhaps the pressure switch. Is there some way I can test this without going through the dealership for diagnosis? It's hard to find a reputable shop around here. Thanks in advance for any thoughts you may be able to share.

[boschmann]

Is this on the 2000? Does it have the automatic "climate control" system or the manual system where you push the button for each function?

[Ana Marena]

Hello, and thanks very much for your reply and interest in helping. It is manual system, not the convoluted climate control. My neighbor had a look today, and says that the clutch isn't running in the compressor. So he did a voltage test and says it isn't getting enough power. He wants to check the relay, but I can't seem to find a wiring diagram online to locate it, except I did find a vague reference online to something on the second fan. I've spent about 3 hours online tonight looking for info. I never thought I would learn so much about A/C. I must say it is very interesting though.

[Ana Marena]

Sorry, I forgot to say that it is a 2000, a GL. Automatic. I recently had the MAF diagnosed, then repaired by the dealership. The air quit working after they did the diagnostic, but I think that is coincidence.

[boschmann]

I would have it checked for a low charge. I don't believe there is a relay involved. There are several fuses that can affect it; #5, #16 & #25 in the fuse panel. Also check The two 30 Amp fuses in the fuse bracket behind the battery (for the cooling fans).

[Ana Marena]

Hello Boschmann, thanks so much for the info. I did check every fuse, all of them are okay. The neighbor even went through and tested those that you mentioned with his voltage meter, in case one was bad and didn't show a broken connection, and they were all good. I will check those you mention near the battery. The charge (freon or cooling stuff) has been checked, it is full according to the tech. Do you know how I can locate a reputable shop if it comes to that? The one I went to was supposed to be an A/C specialist and he didn't even check the compressor or notice that the clutch wasn't engaging, so he's out.

I really appreciate all the help. I've also enjoyed learning a bit more about A/C systems and recognizing the different parts from the info available, thanks! A week ago I couldn't have identified a compressor or a clutch to save my life. I look forward to looking for the switches you mention near the battery, and I will tell my neighbor that there is no relay. I am grateful for the help and expertise you bring to this forum. I will let you know if your suggestion fixes the problem. Take care. Ana

[pamajoer]

BEST ADVICE WHEN IT COMES TO A/C TECHNICIANS IS WORD OF MOUTH. OR GET TO KNOW ONE!!!!!!!!!!!!!! Definitely ask around at work, school, people you know....Tell them you need to find an "honest" a/c guy to take a look at your a/c. Word of mouth is the best when it comes to mechanics. GOOD LUCK!
The 2nd way is to get a "guide" from the better business bureau, or maybe call a local church, maybe they would have someone in the congregation that would at least give you a honest diagnosis, or at least an 'honest' guess.......
Make sure to post what you find out!!!!!!!!!!!!!1

[Ana Marena]

Hello Pamajoer:

I think that is great advice, and I will start asking around and see who I can locate via a reference, and will also check the BBB, that is EXCELLENT advice, I appreciate your help! I will be sure to post what I find out, so hopefully someone else may be able to troubleshoot their problem.

Once again, thank you very much!

[boschmann]

There is a thermal cut-out switch, ambient air temp switch, pressure switch, ECM & the A/C module itself which determines whether the clutch is engaged or not. It may be best to let VW look at it if there is nobody local that specializes in VW repair.

[Ana Marena]

Thanks Boschmann, have been too busy to have a chance to attack the problem since last post. But will follow up with a solution (God willing) eventually. Sure appreciate everyone's help here. Regards, Ana

[johnny d]

Ana, If you are having the same problem as me...insufficient voltage at the compressor clutch than the likely problem is wiring or the AC Fan Control Module. There is a 4 pin connector between the battery and the starter the green/black (+) and the brown/black (-) wires are for the clutch. Have your buddy try checking them with his meter. Then under the battery is the Fan control Unit. There is a 14 pin connector on it and the green/black wire is there again. the brown/black went to ground before this connector. I would also try applying battery voltage and ground directly to the compressor with the engine running to see if the clutch will enguage.