Having problems with your 2004 GMC Sierra ?

2004 gmc 1500 heat is only blowing on passenger side. driver side is blowing cold air.

Posted / edited by AnonymousUser on : 10-12-2018

Answers :

Sounds like you have dual zone climate control in your truck. Most likely the actuator that controls the temp door in the HVAC box
If the A/C works fine and the issue is only with the heat, check the liquid heat exchangers as the feed from the engine into the A/C area.
Repair Help & Product Troubleshooting for 2004 GMC Sierra

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