Question about 1992 Chevrolet K1500

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Heater controls just quit working

I have a 1992 chevy 1500 4.3l 2wd. Went out to start the truck and the heater controls were black wont come on no heat or ac. I have checked the fuses all good I have also put two new controls in and nothing. I have tested the wires in the back of the controls some have power once you put the test light on them you can hear the relays behind the glove box open and close. Please help dont know what to do now or were to start

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  • 92C1500422K Feb 08, 2009

    I have the same problem with a 1992 Chevy C1500. My Climate Control (Digital HVAC controller) would be intermittent as far as the display functioning or not. When it is not functioning, of course there is no HVAC. I have the same problem with the connector behind the glove box (although mine only has 3 wires, one is the larger RED, another one is green, and the other is a light color, I forget the other color right now). I wiggled the connection and the display comes back on. My connector was so overheated that the large red wire melted out of the connector. I ended up wire nutting the connection to eliminate the disconnect plug ends on the overheated RED wire.
    I investigated the relays (I am assuming each one is for a different blower speed) and pulled them open. All of the contacts are in good shape, and the coils seem to be very strong.
    My main problem is that my heater blower will not blow in any of the two lower speeds, and when I try to select the high speed, the relays start rattling and the Climate Control screen starts to flicker, then resets itself to a default setting (floor vents, mid temp, low fan).
    I am suspecting a blower motor is pulling too much current (although not enough to blow a fuse). I am still investigating my issue, but I just witnessed the RED wire connection issue resolving the display of the Climate Control Center.
    Off topic, how many miles do you have on your '92 Chevy with the v6? I replaced my engine at 375K miles. Did not have time to see what the damage was, but think it was just a head gasket. Got a v8 5.0 L to put in it. That engine had 200K miles on it. Have put another 50K miles on that engine still using the PROM and computer from the v6. The vehicle has 422K miles.


  • 92C1500422K Feb 08, 2009

    I have the same problem with a 1992 Chevy C1500. My Climate Control (Digital HVAC controller) would be intermittent as far as the display functioning or not. When it is not functioning, of course there is no HVAC. I have the same problem with the connector behind the glove box (although mine only has 3 wires, one is the larger RED, another one is green, and the other is a light color, I forget the other color right now). I wiggled the connection and the display comes back on. My connector was so overheated that the large red wire melted out of the connector. I ended up wire nutting the connection to eliminate the disconnect plug ends on the overheated RED wire.
    I investigated the relays (I am assuming each one is for a different blower speed) and pulled them open. All of the contacts are in good shape, and the coils seem to be very strong.
    My main problem is that my heater blower will not blow in any of the two lower speeds, and when I try to select the high speed, the relays start rattling and the Climate Control screen starts to flicker, then resets itself to a default setting (floor vents, mid temp, low fan).
    I am suspecting a blower motor is pulling too much current (although not enough to blow a fuse). I am still investigating my issue, but I just witnessed the RED wire connection issue resolving the display of the Climate Control Center.
    Off topic, how many miles do you have on your '92 Chevy with the v6? I replaced my engine at 375K miles. Did not have time to see what the damage was, but think it was just a head gasket. Got a v8 5.0 L to put in it. That engine had 200K miles on it. Have put another 50K miles on that engine still using the PROM and computer from the v6. The vehicle has 422K miles.


  • mark_eidson
    mark_eidson Jul 02, 2012

    I just had the same problem with the HVAC control panel going out in my 1992 Silverado.......it was the red wire in the 3 wire connector behind the glove box......the red wire contacts were loose and the connector totally melted around the red wire.....this could have caused a fire.......

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I have a 92 Suburban with the same issue (been going on for about a year) AC will turn on when hit a bump in the road... and off with the same type of bump...

I had researched just about everything including replacing the RELAY behind the glove box...

this still didn't help...

finally after replacing most the hardware... I started tracing the wires and found that there is a plug under the glove box there there is a HOT (red) wire that was overheating due to a bad connection and it was melting...

here is where my plug is...
- open the glove box & remove the door
- remove the screws on sides of glove box and remove the glove box it's self...
(you should now see many wires and things)
- now this is where I replaced the relay... I think it was the middle one... if you replace it you will want to refer to a manual or call a dealership to make sure you replace the right one... (it was like $24 or $27)... here is a link to what the relay looks like...
-then if you follow the RED wire out of that relay.... about 3 feet of wire or so.... you will find a connector... with 5 Wires (Mine are colored - Red, Orange, Lime, Black and Green)

** this is the connector that seems to be my problem

Either Replace the Connectors or the (cheap way to fix it is remove the connector and clamp and/or sodier each of the 5 pairs of wires together without the plug... )

I am currently waiting for a new plug from my local dealer but I have bypassed the connector and manually connected the wires until the dealer gets the connector get it...

Hopefully that helps...

Posted on Jan 25, 2009

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You can try this, I had the same prob. a year ago and it ended up being the plug at the back of the control or I should say a dirty plug. All I had to do is pull the control unit out through the front (may reach up under dash but wouldn't be easy) Remove big plug from rear and clean the flat connectors it plugs onto. I simply used fine fine sandpaper. Plug it back in and try it.good luck

Posted on Dec 12, 2008

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Posted on Nov 18, 2009

SOURCE: heater blower motor just quit working during heavy rain

The rain had nothing to do with it. What ever GM told you was a quess,unless they worked on it. You never change parts until you know their bad. Have to at least know how to test relay, if you do find it. Stop by dealer,they will come out and remove it for free

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