Question about Chevrolet Tahoe

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2007 Chevy Tahoe will not blow hot air unless I'm driving. Heat works fine until I come to a stoplight, then it starts blowing cool air after sitting there for a minute or so. Any suggestions

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This is pretty common with a leaking head gasket. The heater core collects the bubbles as the coolant passes through it until finally it's full. When you take off the motor turns faster and the water pump makes enough pressure to flush the bubbles on through the heater core to the radiator tank where they end up going into the coolant recovery tank. Watch the coolant tank as you pull the throttle open sharply, see if you see bubbles in it.

lp

Posted on Dec 29, 2010

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Posted on Jan 02, 2017

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I have a 2007 Saturn, Aura. Heater does not blow hot, slow coolant leak, & it also over heats. Please help! I'm freezing when I'm in my car!!!


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Chevy 2005 tahoe z71 blows cold air in back but hot air in front


Just got an answer from Chevy Dealer. When you replaced the battery it loses its memory as to where the door actuators were (the flaps that control the heat and A/C).

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Turn everything off and let the car sit overnight. The computer should reset itself during its learnings process.
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My heater, when parked and idle, cools down. The heater will heat again once I begin driving, but this is freezing me as I sit and wait for my kids at school. It blows cool air while I am parked and will...


It could be the electric fan is going on too easily.
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If both start slowly getting warm at the same time, then you need a new thermostat.
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