Question about 2002 Chevrolet Impala

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2005 impala-heater blows cool air even when temp is high, occasionally will blow out a little heat. If I am idle, the thermostat goes almost to the red, no heat blowing in, then when I start driving, goes back to the middle for temperature. Help please.

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Change your thermostat.

Posted on Nov 14, 2009

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Blows cold air turn heat on


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Heater temp on high only bows luke warm air after driving. A/C works just fine.Plenty of cold air from it


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I have a 2003 chevy impala. Just recently come acrossed in issue where the heater blows nothing but cold air even with the temp gauge going as high as it can get. Weather its at an idle or being driven....


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and your temp gauge is normal in the middle then most likely u have a bad blend door actuator usually on the passenger side

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Why does the heater blow hot air when I drive after its been idling for 15min and not during the idle when it reaches the 100 Temp?...(it blows cold air in idle)


Firstly, a thermostat that opens quicker will not give you better heat. Your heater core may be partially plugged causing a low flow issue. Another area to check would be the water pump impeller for corrosion or slipping on the shaft. Does the vehicle's cooling system operate well otherwise?

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My 1999 Chevy Malibu runs hot? It started when it overheated. We changed the thermostat, then water pump, then temp sensor gauge and the temp gauge goes high but only when the heater stops blowing hot...


Air pockets will make the guage do that, and also cause your heat to come and go. Also, a poor radiator, as in rotting, or plugged up, will cause high temperature issues.

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My 2004 Chevy Impala only blows cold air with heat on. The heater would only keep it a little warm the other day but now only seems to be blowing cold air.


Check in the main radiator with the motor cool that the coolant is full as if the coolant is low there will be no heat in the heater. If it is low you need to check for leaks or head gasket problems. If its full check that the temp guage is coming up to its normal position as the thermostat could be faulty. Then make sure that the heater tap is operating corectly.

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Blowing cold air when idling


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2006 chvy impala when idling dont blow hot air


1 Inspect Cooling System Mix Coolant level low or flow is restricted. grey_line.gif 2 Inspect Thermostat Thermostat stuck closed grey_line.gif 3 Inspect Heater Control Valve Leaking or defective heater control valve. here something to help u

Here to help Shaun

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No Heat in 99 Taurus


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Nov 21, 2008 | 1999 Ford Taurus

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