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Discussion Starter · #1 ·
Hello! I was having an issue with my heater and seeing what everyone thinks. I have a 2008 Sierra 2500 and so I have remote start. Normally when it’s below like 30-32 my high idle kicks on seats heat up and the heat goes on high. In the summer ac goes on high depending on temp.

Lately it’s been cold as hell at night and most of the morning. When I hop in the truck after 5-6 minutes of warming up the seats are on and warm the truck temp is good but the heat does not come on. Soon as I turn the key the heat and everything comes on. Do I have to reset the HVAC system ? Anyone else have this issue?
 
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