A/C control panel

[65-f100]

Does anyone know if the a/c control module is serviceable? My Recirculate function does not work - button does not light - does not go into recirculate mode. Everything else works fine. I pulled the dash panel off and it appears that it is a sealed, non-serviceable part. Do I need to replace the whole piece? I didn't know if I could get to just the switch to see if it could be repaired/replaced. Thanks!

[Phil Holmen]

What year of truck??

[Alf]

Note: there are no user servicable parts inside.
IIRC about 80.00?

[DickWells]

I replaced my control unit while I was in Brownsville, Texas this last February. The cost was about $187.00. I had fooled around with mine, trying to get it to blow cold, for about three weeks. There was a thread in the Forum during that time by Britanic (I think). He had replaced a transister in his, and got it fixed. I replaced the same transister, but couldn't get it to work.
I had more issues than just the recirclulate switch, though. I think that if that was all that was wrong with mine, I'd just wait on it, till it bit the dust completely.
The new unit was for a 97, or 98+, and was quite different inside than my 95. On the new unit, the recirc. is automatic if you have the function knob in the bi-level position. Like the first guy said, "What year is your truck?" Puting in a new control unit could be a good upgrade, like it was for me. If I had known that the later trucks used a unit that would just slip right in, I probably could have gotten one from the junk yard.
FWIW, Dick

[MEdlin]

I'm having the same problem with my 94 Sub. The AC will go into REC by itself sometime, other times, it won't turn on to save my life. [img]smile.gif[/img]
Will the newer model AC control modules fit in the 94 truck?

[charliepeterson]

I believe GM knows about this issue with the controllers. They have changed the design slightly and the pigtale updated ones will plug right into a '94 with no problems.

[65-f100]

Mine is a 96 and has the separate Recirc. button. So you're saying the 97 and later panels will plug right in? Are these a better design?

Thanks for the info. as always.

[DickWells]

Yes, the later units will plug right in, and, they do seem to be an up-grade, in that GM has made them even more solid state and slightly smaller, which indicates to me that they had problems with the early ones, that were taken care of with a re-design. Worst thing is the price, which can be circumvented by looking around for a unit out of a wrecked truck. I know the Taho's are the same, as well as Suburbans, and (I think) even the later Astro Vans.
Dick

[65-f100]

Dick - sounds like a good swap. What later years will work?

[charliepeterson]

IIRC anything in the '94-'99 range will plug right in.

[whatnot]

I think that S-Blazers are the same too.
A '94 would have the old style dashboard and be completely different.
I think that s-Blazers are the same too.

[mlwilliams]

I have a 95 silverado and the A/C won't come on and the anti-lock dash light comes on when I turn on the fan. Is this part of the controller problems you guys are talking about? No codes are set in the controller - it's a bit frustrating to track down.

Thanks

[DickWells]

I'm hoping that Britanic, or whoever it was that posted that fix, back in Feb. sees this thread and responds to you guys, because he had a much better handle on electronic/electrical things than I do. GMCTD is another one who could probably help you out. Easily. He's a wizard on this stuff.
I think Carlie is right, the later stuff being interchangeable through 99. My 95 Astro is all mechanical/vacuum operated, but my son's 98 Astro appears to be the same a the 95-99 Suburban. Hope you can find a donor at the junk yard. I had one in Brownsville from a 95 Tahoe that fit, but didn't work. I ended up at the Chevy dealer, and paid a little over double what the used one cost. But, the new one worked, and is still working. Like I said a while ago, the solution that works is the right one. I guess in this case, the cost was worth it.
Dick