C68 hvac is stuck on the hot setting

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03-11-2018, 09:54 AM

#21

Gary Bagley

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Quote:

Originally Posted by Churchkey

Have a 90 when there are C68 head issues disconnecting the battery for a few seconds will reset it = normal operation.

Insure there is good vacuum the hose connection / connector @ the rear of the intake is prone to fail.

Good luck.

Tried that doesn't work

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03-15-2018, 09:25 AM

#22

jts90vette

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My money is on a failed actuator. I hear they are a pita to change on a 1990. The way I understand it, there is some extensive dash disassembly required to work on it?

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