What is your question?
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What is your question?
Single zone heat / air system, automatically swaps vents location, and goes from cool to heat?
What makes this problem better or worse?
Bumpy roads
How long has your 2008 Chevrolet Silverado 3500 HD had this problem?
Months
1 Reply
Hello, sounds like a temperature blend door issue, and / or a mode door issue. Would be somewhat unusual to be both - so I would check into temperature blend first. The motor for the door could be a concern, or the door itself. Both the mode door and temperature blend motors are electric - and could fail. Hands on testing is needed. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.