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Control panel quits working

Tiny
RIVERAT1970
  • MEMBER
  • 1998 GMC C3500
  • V8
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
I have 1998 gmc sierra 3500. The two buttons for recirc and a/c stop working and the defrost floor selector quits working. Bought a junkyard panel and it worked until I charged the a/c system. The compressor kicked on for three short bursts and then the lights went out and the level selector quit working on the "new" control panel. What could be burning up the control panel, no fuses are blowing and the relay is fine. Fan speed works and temp select, just not a/c, recirc or the level selector. Stumped.
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Tuesday, August 9th, 2011 AT 6:51 PM

5 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You probably have a shorted wire and is grounding out. Check this if you have ahad an alarm system or soemthing else installed. You may have a bad acutator on the heater box as well. I'll send a generic pic along of the actuators.
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Tuesday, August 9th, 2011 AT 8:54 PM
Tiny
RIVERAT1970
  • MEMBER
  • 3 POSTS
Well when I first installed the junkyard control panel the hi/lo selector worked fine. If blew right in my face until I added freon, the compressor kicked on and off a couple times then the control panel went out just like the original did. Is there anyway that a bad compressor could feed back to the control panel?
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Tuesday, August 9th, 2011 AT 9:32 PM
Tiny
RIVERAT1970
  • MEMBER
  • 3 POSTS
When I said hi /lo I meant the floor, face, defrost selector.
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Tuesday, August 9th, 2011 AT 9:32 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There are fuses and relays that should blow out before a control panel should. But you could have overloaded the amount of freon you installed andit may have screwed up the compressor. I'm sending two diagrams put them in your picturefolder to enlargethem. But the a/c compressor circuit shows lno protection so you may have a bad low pressure switch or high cycle switch onteh compressor. But still check for a grounded wire or a bad ground or on the hvac circuit melted wires at the blower resistor and touching together.
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Tuesday, August 9th, 2011 AT 11:01 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
That is the actuators that I sent earlier that direct the flow of air
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Thursday, August 11th, 2011 AT 1:13 AM

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