Question about 1999 Chevrolet Monte Carlo

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Engine overheating changed thermostat turned on heater blowing cool air

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Hi, do you have to keep adding antefrezze ????

Posted on Sep 01, 2008

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My 2002 buick lasabre heater blows cold.


Assuming the cooling system is full and there are no air pockets, are both heater hoses getting hot when the engine warms up ?
If so, it could be a blend door problem under the dash.

Dec 13, 2012 | Cars & Trucks

1 Answer

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.

Sep 20, 2011 | 1999 Chevrolet Malibu

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1997 Cirrus is still overheating... The heater does not blow out hot air...would the heater core cause the vehicle to overheat? if not, what other problems am I looking for, I was loosing anti freeze...


it appears that you have a large air pocket/low on coolant. The engine is getting hot due to the lack of coolant but there is no heat because nothing is flowing through the core.

Feb 20, 2011 | Chrysler Cirrus Cars & Trucks

1 Answer

How do i replace my thermostat...my heater is blowing cold air and the check engine light is on


if your engine temp is normal, don't blame the thermostat. See my post at http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air for troubleshooting steps and let me know if you have questions.
If your engine temp is running cool, then by all means, replace the thermostat. Instructions for changing a thermostat are posted here: http://www.fixya.com/cars/r5929960-s_thermostat Just ignore all the talk about overheating. If your car is running cool, the thermostat is stuck open, whereas the above post assumes the thermostat is stuck closed.
On the engine light, please get a free scan at your local parts chain, write down the trouble code(s) and send them to us for advice. Could be related to the heater or might be something else.

Dec 01, 2010 | 2009 Chevrolet HHR

2 Answers

Heater blowing hot then suddenly blows cold and engine overheats. Intermittent problem. After engine cooled may overheat again with heaters blowing cold then suddenly heater blows hot again and...


I have written a tip on this.
You may have a couple of problems. I would first replace the thermostat, and make sure you have the proper coolant(ant-freeze) level.
Please let me know how it goes and if you need further help I am here.

Feb 09, 2010 | 2002 Toyota Celica

1 Answer

1994 Dodge Spirit heater blowing cold but radiator is overheating


1st you need to make sure no air in your system open you radaiator cap and your heater to max and see if air bubles or circulation is going on fill up accordingly otherwise you have blockage in your system or water pump if no circulation ////make sure no bubles all bubles should be gone////look for coolant circulation in your radiator make sure your thermostat is not defective or placed in the right position.

Jan 14, 2010 | 1994 Dodge Spirit

3 Answers

My 98 windstar is randomly overheating and no heat


try changing the thermostat for starters.

Dec 20, 2009 | 1999 Ford Windstar

1 Answer

'90 Subaru Legacy overheating....


cool air and overheating point to low coolant level. Do you have a bleeder valve near the thermostat? You may have air trapped in the system. If no air trapped, the radiator may be plugged up not allowing proper circulation of coolant.

Mar 24, 2009 | 1997 Subaru Legacy

4 Answers

Heater blowing cold air


My 2005 Nissan Sentra 1.8s with 55,000 mi. blows cold air from the heater. Coolant not circulating in engine. Lower hose stays cool to touch. Both heater hoses cold. Changed thermostat - didn't fix it. Coolant not leaking or dirty. None in oil - no oil in radiator. Changed worn water pump belt - pump spins freely with no noise or resistance. Cooling fans come on after warm-up. Temperature gauge stays in normal range then jumps to hot and back again. Coolant good to 10 below - didn't freeze here yet. No other problems or repairs to car. Afraid to drive and make worse. Help!

Dec 22, 2008 | 2002 Nissan Sentra

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