AC not working..

[tom4bren]

Intermittent electrical problems are the worst thing to try & trace. I'm guessing that with all of the work you've done behind the head unit, a connector may have come loose behind the dash. Since none of the fuses were blown, that would be the next thing I'd check.

[WormGod]

Wow, people using A/C? I am still using my heat! Heh!!! Though, I can't use A/C in my VX with my S/C cause it causes too much overheat anyways.

I will agree it doesn't sound like the unit as much as it does the electronics/wiring. And sadly, that is where I draw the "dumb" straw. I heard of a similar problem with a buddy who has a VW. His auto temp control had a mind of it's own. A visit to a VW dealer revealed and solved his issue. I never heard what the issue was though. Pesky dashboard poltergeists.

[etlsport]

haha its not just the AC.. I cant get the climate control to do ANYTHING when it does that, no heat, no AC no fan no nothing.. I looked through the electrical troubleshooting manual, I'm going to check the fuse for the blower controls again, then like joe mentioned, the relay seems that it could be a likely culprit from the wiring diagrams. I need to get behind my dash soon anyway to take care of a few other little electrical gremlins, at least i know what the problems with those are. at this point i have pretty much completely re-wired the VX stereo, and lighting, so i just have to hope i labeled everything correctly so it will go quickly!

[etlsport]

ok got in there finally.. saw no loose connections, so i went into the fuse box.. got the vx to start with no ac/heat controls at all, so i started pulling fuses and re-inserting to see if that would cure it.. nope

moved on to relays.. as soon as i pulled the relay marked "heater" in the engine fuse box i got all sorts of fun noises.. put it back in and the AC was working.. so ill see if maybe it was a bad connection.. if it happens again ill replace the relay

[etlsport]

still happening.. called up merlin to order the relay.. $26!! i was expecting like 5 bucks.. oh well, should be waiting on my doorstep when i get home so hopefully that'll solve the problem

[VehiGAZ]

I'm gonna guess that the new relay will solve your problem. There are not really any other components that would cause the behavior you've been seeing.

Some relays are $5, some are $50. There's one relay on my 928 that costs about $125 last I checked. Guess what? I'm not carrying a spare of that one!

[etlsport]

the new relay actually made it WORSE!

before the new relay, the AC would work 100% of the time on a cold start
about 33% of the time after 1-2 hours of sitting
about 60% of the time after less than 10 minutes of sitting

the new relay works 0% of the time on startup.. i have to go under the hood and pull the relay out and re-insert it to get ac controls ever.. which was unfortunate since last night was cold and rainy = lots of foggy windows

i guess ill put the old relay back in for now