Having problems with your GMC Sierra 1500 ?

Defrost only works - Sierra 1500 GMC Cars & Trucks

Posted / edited by AnonymousUser on : 01-05-2017

Answers :

If this is a vacuum operated system it would indicate a lack of vacuum to the HVAC sytem. A broken hose or something like that.
Repair Help & Product Troubleshooting for GMC Sierra 1500

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