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Old 08-20-2017, 05:18 PM   #1
tripworsham
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Default AC Short between Control head and Comp.?

2006 Ion2 blower motor become intermittent. Chevy dealer diagnosed new control head required - $475. I found one at GM Pros on line for $152. Upon install of new control still no blower, and the AC button failed to start the compressor. Reinstalled old control head, still no blower but AC button starts compressor fine. Took blower switch from new control head and installed in old control head and reinstalled. No blower or AC compressor start. Reached under glove box and wiggled wiring - blower starts. No amount of wiggling starts AC compressor. Cleaned all contacts, examined wiring from control head to fire wall no obvious areas of damage or shorting. Still no joy on AC button, blower doing fine. Anyone have any ideas?

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Old 08-20-2017, 05:38 PM   #2
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Default Re: AC Short between Control head and Comp.?

You're describing at least two separate problems - ac compressor running/not running and blower circuit. Wiggling wires means possible cooked wires for the blower motor. Look for burned/discolored wires, and ground as connections are the most likely areas for higher current flow from resistance (corroded/loose connections). You're likely to find blower control wiring problems. Powering on compressor is not a switch issue but more about possible refrigerant leak issues. Before these problems popped up, did ac work at all?

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Old 08-20-2017, 06:59 PM   #3
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Default Re: AC Short between Control head and Comp.?

Yes the ac was working fine before replacing the control head. Last summer it was rebuilt by Chevy dealer. Only issue was the blower - until the control head replacement.

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