HHR heater won’t turn down

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Nov 22, 2024 | 09:07 AM

Corvairdan

Thread Starter

Joined: 08-19-2023

Posts: 2

From: Willow Spring, NC

HHR heater won’t turn down

I have a 2008 HHR. If I start the car cold and don’t turn up the heat it stays off. If it turn it up, the heat comes on full blast and won’t turn down. Any ideas? Is it the heater control module?

Nov 22, 2024 | 09:13 AM

Oldblue

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Joined: 10-13-2011

Posts: 39,900

From: Welland,Ont Canada

Most likely the heater resistor

Nov 22, 2024 | 09:28 AM

donbrew

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Joined: 01-23-2009

Posts: 26,448

From: Fredericksburg,VA

If you mean that the fan only runs on high it is the resistor

Nov 25, 2024 | 09:38 AM

desertrat

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Joined: 09-25-2009

Posts: 159

From: Palm Desert, CA

If it is the original heater fan you have to cut it out with a razor knife. I'm not sure if the resistor is with the fan or behind another panel.

Nov 25, 2024 | 10:20 AM

donbrew

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Joined: 01-23-2009

Posts: 26,448

From: Fredericksburg,VA

When the resistor goes bad the default is high only, because the path goes directly to ground. The resistor is a separate module.

Nov 25, 2024 | 02:01 PM

Oldblue

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Joined: 10-13-2011

Posts: 39,900

From: Welland,Ont Canada

The resistor is easy to change , and not very expensive

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HHR heater won?t turn down

HHR heater won’t turn down