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Old 01-17-2007, 11:17 AM
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Join Date: Aug 2006
Location: Houston, TX
Posts: 450
Climate Control question

New duovalve/pump assembly recently installed. Also have rebuilt CC unit. Getting good heat left & right. CC is showing E075, which indicates problem with duovalve pump.

When you drill into the troubleshooting steps for E075, it indicates you should check the left connector at the CC for pin 12 to ground. With the dials set at blue detent, it says you should see 11-14v, and with the dials at the red detent, you should see <1v. This seems COMPLETELY BACKWARDS to me - shouldn't voltage be present when full heat is selected, and absent when full cool is selected?

The car has a new wiring harness, if that matters.

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Old 01-17-2007, 01:23 PM
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Join Date: Aug 2006
Posts: 141
Heater problem

That is correct information! The hot water valve closes when 12v is applied.

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