Question about 2005 Chevrolet Impala

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Heater blowing cold both sides

I changed the thermostat and the temp gauge still goes up and up and the heater is blowing nothing but cold air?

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Does it blow warm air when you drive the car? If so its the water pump.

Could also be air in the coolant system

Also have the cylinder head pressure tested to rule out a hblown head gasket
Hope this helps

Regards
Steve

Posted on Dec 11, 2008

5 Suggested Answers

dr_layinlow
  • 60 Answers

SOURCE: 2001 malibu-heater is blowing cold air

sounds like you have a bad temperature sensor in dash or the cable has eitehr broken or come off the heater switch under the dash!!

Posted on Dec 07, 2008

  • 366 Answers

SOURCE: 2004 Tahoe Heater Problem

check coolant level ,must be low ,chck for coolant loss

Posted on Mar 05, 2009

  • 2 Answers

SOURCE: temp. gauge is at halfway mark and heater blowing cold air

prob needs thermastat,sounds like u dont have one at all

Posted on Jan 29, 2009

dvs9mm1971
  • 114 Answers

SOURCE: Temperature gauge fluctuates and the heater blows cold air

Sounds like the thermostat needs to be replaced. If you do the work yourself be sure the temp threshold is correct and the flow direction is correct when installed. Good luck to you

Posted on Oct 16, 2009

  • 1779 Answers

SOURCE: 02 silouhette temp gauge keeps moving up & down heater not workin

Probably. Is the coolant level ok? If yes, then change the t'stat, sounds like it's opening and closing randomly, may be defective.

Posted on Jan 11, 2010

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2003 chrysler town and coy try, temp gauge goes up and heater gets warm when idling, but as we drive the temp gauge goes way down and heater blows cool air. Any suggestions?


1. Engine Coolant Temperature.
If the thermostat in the cooling system is getting stuck in the open or partially open position rather than opening and closing as needed to keep the coolant at the required operating temperature then you will get the results you have described here with the coolant temp dropping as you drive. The radiator is providing optimum cooling when the car is moving and there is plenty of cold air flow through it.
I am assuming the temp gauge in the vehicle is reading correctly.

Thermostats in the cooling system do become faulty in time and it may well never have been changed (or only changed once) since the car was built and is possibly gummed up with debris. With those symptoms I would definitely change the thermostat. Make sure a full flush of the cooling system is done at the same time and refilled with fresh coolant.

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I would not worry about the interior heating until you change the thermostat on the cooling system. However if you continue to get cold air from the heater then there will be an issue with hot coolant from the cooling system being restricted in flowing through the heater core.

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To troubleshoot this types of problem,click the link below :---
Car heater blowing warm, but not hot air?http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html

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http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html

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http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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http://technoanswers.blogspot.in/2012/02/heaterac-blower-motor-not-working-on.html

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http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html

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