Cosmo Kramer

I started a thread a while ago explaining that I had lost my HVAC. No control, no blower, nothing at all. I jumped the blower relay and the blower would work but all the other controls (temp slider and blend) were still dead. I tried changing head units to a known working one and still nothing.

I suspect it is a wiring problem under my center console as I have some other electrical issues nagging from the summer so this could be tied into that. Just to make sure, I wanted to know what fuse powers the HVAC head so I can check that first. I looked in the fuse chart and nothing is listed and the wiring diagram for the HVAC really has my head spinning LOL!

WallyP

"Fuse #8 - Air Conditioning System"

On Page 97-221, in Zone E35, you will see that fuse, with a black/white wire running from G13 to Terminal 10 of the HVAC head unit.

Cosmo Kramer

Thanks Wally! I saw that one in the diagram and I thought it was it. I will check it out.

jthwan22

The little blue relay on the HAVC board control the AC clutch. I mounted a bigger relay using Wally's instruction. I don't think there is another relay on the HAVC PC board.

Cosmo Kramer

Bingo! Fuse 8 was toast, I thought it was for the A/C clutch and didn't check it. I have full HVAC now, just in time to put the car way for the winter.

Imo000

Nice but why did it blow?!?!? Do you still have the reverse/interrior light problem?

Cosmo Kramer

Yes still have that problem. Drove the car for about an hour and it was still fine. I also replaced my HVAC head at the same time, so maybe something was wrong with it. Could have been a cheap fuse, it blew in the summer when using the A/C.