2013 GMC Sierra 1500 Questions

Get answers to your auto repair and car questions. Ask a mechanic for help and get back on the road.

Find questions for your car.
I warm engine to operating temp(210*) but heater blows cold air until I begin driving then works as it should. One heater hose is hot while other is cold at idle. I'm thinking plugged heater core but it just turned 40,000 miles. Is there a valve in the system?
Get an estimate and never overpay again
RepairPal guarantees your repair will be done right.