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1992 GMC 5.7 4x4 k1500 hearted blows cold

Warm truck up trun on heater blows cold air put in radiator

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Check flaps in heater box under dash.

Posted on Dec 22, 2016

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Hot to cold air in 1999 GMC Envoy


heater core plugged. remove heater hoses, use tap water to flush out core..

Jan 17, 2013 | 1999 GMC Envoy

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My heater starts heating & then it suddenly quits & starts only blowing cold air. Is my heater core also clogged or is it something esle?


I'm thinking your cooling system has air in it. If you have recently drained and refilled the radiator, then that is probably what's wrong. I'll be brief, and tell you how to get rid of the air. Put the heater control on hot, fan off. Remove radiator cap. Start engine, let it warm up. Watch the coolant level in the radiator, when the thermostat opens the coolant level will drop. Add antifreeze to bring it back up to full. It will drop again. Add more antifreeze. Continue to do this until the coolant level no longer drops and the coolant is flowing good. Put the radiator cap back on. and see if the heater is working better.

Jan 08, 2011 | 1996 GMC Sonoma

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I have a 2001 GMC Safari van V6 4.3L. The van will RUN at normal temperature and blow warm air but when you come to a stop it blows cold air. What can you tell me about this problem. Changed thermostat and...


Try stopping on a steep incline--does the heater stay warm? If yes, what you have is an air bubble that hangs at the heater hose until pressure from the water pump blows thru it as the engine speeds up. Park on an incline, open the radiator cap, run the engine until the thermostat is open, and fill the radiator to the neck. Wait until the level stops dropping and make sure bubbles don't continue to come up. If they do, you may have a blown head gasket that will keep forming these bubbles until you change the gasket. Please let me know the outcome, as we are getting a lot of these cases and are trying to improve the answers.

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1 Answer

Heater does not blow warm air.....radiator has fluid


Check Heater core under dash, could be plugged. Also look at hoses going to it.

Dec 04, 2010 | 1992 Chevrolet K1500

4 Answers

The heater still won't work after I changed the thermostat on my


Get a female garden hose adapter from the local hardware store. Disconnect the heater hose from behind the fan pulley and attach the hose connection. Disconnect the other heater hose behind the alternator, aim it towards the ground and flush water through the heater core. This worked on my truck.

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2001 gmc jimmy engine warm but heater blows cold air


Disconnect the heater hoses from the water pump and the intake manifold. Get a compressor and blow out the hose (put the air hose into the the hose that came off the mainfold. then flush the system and replace the antifreeze.

Dec 11, 2008 | 2001 GMC Jimmy

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