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2013 GMC Sierra 1500 Questions

Get answers to questions about your 2013 GMC Sierra 1500 at RepairPal. Find solutions, diagnose problems and get back on the road.

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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?