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I just had my coolant flushed at a dealership, I paid $85 for the good flush instead of the $45 drain and refill and now my heat doesn't work in my truck, has anyone had this problem before or heard of this happening?
You probably have an "air bubble" in the system and the coolant is not circulating round to the heater.
If it was done at a dealer, take it back and get them to finish the job properly.