Question about 1991 Chevrolet K1500

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I have a 91 Silverado k1500. It has the push button AC and heater control panel. The panel does not function - no fan - no heat - no air - no lights in the panel. The part number is # 16128435, it is the 3 speed fan style with the "RECIR" button rather than the "MAX" button (part # 16204785). I installed a used 16204785 (max button style) and found the same results. No function - no lights in the panel. There is current showing at some of the connector points on the truck side connector plug. I have cleaned the connector points on the back of the panel and in the plug connection. I have checked the fusable links near the fire wall and all seem fine. I have checked the fuses under the dash and all are fine.

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My 1991 had the same problem...after many hours the hot red wire from the fused link on the firewall had voltage but it was lost at the 3 wire connecter behind the glove box (It must of got hot and melted and the connection was broken) the two green wires were also shorted out to each other...all I had to do was cut out the connector and reconnect the wires again and had my air back...hopes this helps...look for the 3 wire connector behind the glove box and disconnect battery and check for continuity.

Posted on Aug 07, 2011

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Hello,

Well, I can't tell by your explanation if the knob stem is broken & just spinning around or if it feels normal and nothing happens.

So, I guess I would first have you check all the fuses labeled "AC" or "Heater". Might be just a blown fuse, but remember, fuses always blow for a reason. There are many things that can be causing your problem like the heater/ac fan speed relay or a broken wire, etc.


I don't how auto repair savvy you are but, Google "Mazda 3 a/c panel". You will see many things on that first page like inexpensive replacement knobs, etc. There are even several YouTube videos on how to gain access to your ac/heater control panel. There is a wealth of information there. If you are not a do-it-yourselfer, you can at least look through there to educate yourself before you take your car to someone. Being informed ahead of time is very valuable.

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HONDA CIVIC 2001 - 2005
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For clarification, it seems that you are getting air blown through the system but there is no temperature change, hot or cold?

Your heater control panel is cable operated with sliding knobs, not like the newer electronic controls with push buttons. It is a "mechanical" set up as opposed to an electrical situation.

Does the slider for the temperature control feel like it has tension and is moving mechanisms in the dash somewhere? If not, the cable, which has an "S" curve on the ends, may have slipped out of the arm either behind the heater control panel or at the AC box where the door is. Also, check the heater control valve on the firewall under the hood to see if the arm on the valve is moving properly when the temperature slider is moved.

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