Heat only works on max and if vehicle is in motion

Asked by David Jan 09, 2020 at 11:25 AM about the 2004 GMC Sierra 1500

Question type: Maintenance & Repair

As title says, my 2004 GMC Sierra 1500 blows heat only when the truck is in motion, once parked I receive no heat, I checked the hoses they were both warm.

The heat also only works if it's set to max.

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