If this car is remote start GM has a service bulletin out to do a computer flash to correct this problem, it will probably blow hot air in the summer if it remote started if you don't have the computer flash done. Hope this helps
Check your coolant level. What u describe is a common problem, the coolant doesn;t flow thru the heater core if the level is too low, so no or little heat. Let me know the coolant level.
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I have the same problem and I check the coolent level and it was right on the mark
the car shut down while I was driving now it wont start. the dash says "starter disabled service throttle"
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