2006 Ram 3500 Single Cab A/C Controls will not work, 100% stumped.

Asked by Aug 03, 2019 at 04:09 PM about the 2006 Dodge Ram 3500 ST LB DRW 4WD

Question type: Maintenance & Repair

AC/Defrost buttons on the Control Head for the air conditioning do not work.
Initially it would turn on about 5 - 10 minutes after driving, then it would not
come on again upon cranking back up. Can't be replicated,
random and unpredictable. Replaced Control Head, still doesn't work. I'm
told to check the fuses, but there are no fuses explicitly for the ac controls,
and none that I can find that are bad anyways, all fuses in the fuse box are
good, what few relays there are are fine aswell.
Because of this issue, only the blower motor will run, and vent direction knob
does not work nor does the AC/Defrost buttons. The compressor is fine,
blows cold whenever the unit gets power. Blend door is fine, changes
direction whenever the unit gets power. The unit is brand new, worked for
one trip to work and after about 30 minutes max, it wasn't working.

I want to make it known that just before this began happening, I replaced the
radio in the truck. The wiring harness for the aftermarket radio is soldered
correctly, and being the the harness has no ignition power, I ran a wire to one
of the cigarette lighters for power. To me I feel like it could be 100%
coincidental that I removed a dash bezel that hasn't been removed since the
truck was made, and may have put something out of place but I have not
found anything after thoroughly searching for anything wrong. Removed
aftermarket radio and reinstalled the factory and the issue persists.

What's been done so far:

1. Possible that AC Control Module is fried, but it was just replaced with a
brand new one and not keen on spending about $150 for a new one.
2. There was a possibility that the connector might be dirty/loose, it's not. It's
as clean and connected as a connector can be.
3. Checked fuses and relays, all good. Nothing blown.
4. No frayed/free wires hanging in dash, everything is soldered and shrink-
wrapped.

At this point its beginning to seem like divine intervention and the AC has not
operated upon doing all this, which has been about 2 months past now.

If anyone could give their two cents on this, that'd be great. Thank you for
reading my novel, Lol.

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