Question about 2000 GMC Sierra

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Myheaterwont blow hot air

When i turn on heat it dont blow hot air

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Hi Dennis, I'm glad to help!

Dennis, sense I'm not there to actually do diagnostics I'll tell you some things you can check and possibly lead you to the repair that needs to be done. Here we go: (1) Check the coolant level in the radiator. CAUTION: Do this only when the vehicle is cold and has not been driven for a while because of the hot coolant that will burn you when you remove the radiator cap. If the coolant is full, then reinstall the radiator cap because this is not the problem with your heat. (2) Drive the vehicle until it is at operating temperature. Then take your hand and check the heat from the heater core hoses. Both hoses should be to hot to hold, it one hose is to hot to hold and the other only some what warm then you need to try and flush the heater core. If flushing does not work then it will need to be replaced. However if both hoses are to hot to touch then the heater core is OK. (3) NEXT: You'll need to check the Temperature door on the A/C Housing. Move the temp control from hot to cold and see if you hear the door moving or if the air flow changes. One way to know for sure if you have a door problem is to remove the door actuator (Motor) same thing. Then take your hand and move the door manually from hot to cold and see if you have hot air. Hope this helps and have an awesome day Dennis.

Posted on Aug 15, 2014

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