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My 2004 Monte Carlo blowing cold air when I put heater on. What's wrong?

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Could be a head gasket leaking compression into the cooling system. This results in an air pocket at the pump that will not allow the coolant to flow at low coolant system pressures. When you rev the engine up it causes enough flow to give heat to the heater core

Posted on Dec 01, 2010

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I have a 2003 Monte Carlo SS. The dual climate control doesn't seem to work properly. With AC going, passenger side blows cold air but the drivers side blows warm air as if it is set for "vent". I replaced...


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Monte carlo blows cold air and overheats


It really runs hot within a minute of starting ?
An engine that runs hot in a few minutes is often having problems with the water pump or a blockage in the cooling system. The thermostat does not open until 195 degrees which takes 5 or 10 miles of driving.
During that time, the water pump should be circulating coolant in the block and the heater hoses.
A leaking head gasket should be putting extra pressure into the cooling system, and-or dumping coolant into the cylinders which would come out the exhaust pipe. But it should still take a few minutes for the engine to reach the boiling point of 240 degrees.

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Mar 04, 2013 | 2004 Chevrolet Monte Carlo

1 Answer

I have a 2004 Monte Carlo and My driver side blows out cold air and my passager side has heat. why dont my driver side have heat???????


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Jan 24, 2011 | 2004 Chevrolet Monte Carlo

1 Answer

Hi. my 2003 monte carlo ss is blowing cold air when I put the heater on? I did notice I need a anti freeze flush. Could this be the problem?


a system flush is a good idea this time of the year.make sure the system is full.water may not be getting to the heater core.also check heater control valve if apply.

Dec 02, 2010 | 2004 Chevrolet Monte Carlo

1 Answer

I have a 2004 monte carlo and my driver side heat does not work it blows out cold air even when the control switch is on the heat my passenger side works fine


Hello and welcome. this is caused by a bad temp door actuator for the drivers temp door. you will need to replace the drivers temp door actuator. this is a electric motor that moves the temp door from cold to hot and hot to cold

Oct 23, 2010 | 2004 Chevrolet Monte Carlo

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I just replaced my 3.4 liter motor in my 2004 monte carlo and I need to figure out why the other motor over heated and blew a head gasket. Before I replaced the motor the heater was blowing cold air and...


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Sep 10, 2010 | 2004 Chevrolet Monte Carlo

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1997 monte carlo no heat


are you sure you COMPLETELY filled the cooling system with anti freeze?

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