Question about 2003 Cadillac CTS

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Heater not heating

Throwing air but no heat

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Check radiator for water level if the radiator is low it wont heat.

Posted on Nov 23, 2013

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Overheating and not throwing any heat


Have a flow test done on the radiator to check for blocked cores. Have a compression test done to check for head gasket and cracked head. Check that there is not an air lock in the cooling system as an air lock will cause overheating and no heater temperature.

Jan 09, 2014 | 2002 Chrysler 300M

1 Answer

My front heater is throwing very little heat the back is throwing more heat could hear the back blower but not the front


If you cant hear the blower on the front side, its probably gone out. If you can hear the blower and theres cold air coming out the vent, its the flap that switches from hot to cold thats not working

Jan 08, 2014 | 2005 GMC Envoy Xl

1 Answer

I have no power to the heater control unit on a 1998 GMC Jimmy. I checked the fuse and its fine. What else could it be?


Let's try and tackle the first problem; the heater. Go ahead and buy a new thermostat just in case because it is only about $12. More than likely, your heating core is clogged up and not letting the Dexcool run through. So what you need to do is flush out the heating core. Disconnect the 'in' and 'out' hoses from the side NOT attached to the firewall. Drain the Dexcool out into a bucket. Once it stops flowing, throw some compressed air into the line (You may need to use a rubber fitting or electrical tape to get a tight seal between the line and the air tool). If there is not too much stuff that comes out, throw a little water into the line and then blow it out with the compressed air again. Note that you want to not stand in front of the end of the line... it will come out quick! Once you have cleaned out the heating core, reconnect the hoses and top off the radiator. You will need to manually pump the radiator hose to circulate the coolant and push out the air.

Nov 11, 2013 | 1999 GMC Jimmy

2 Answers

I only get cold air when I turn the heat on. I change the thermostat and added antifreeze this weekend.


make sure enough water in system might have to bleed small radiator in heater

Feb 22, 2010 | 2004 Mitsubishi Galant

1 Answer

If my car heater doesn't throw out heat just cold air what can it be


either thermostat needs repalcing or air trapped in heater. or blend door in plenum case not working. feel heater hoses going into dash panel behind engine and see if both are hot.

Feb 13, 2010 | 2000 Ford Mustang

2 Answers

Heater not working for my C180 mercedes, blowing air but no heat coming out


heater not warking for my C180 mersedes, blowing air but no heat coming out, hot water which coming from water pomp doesn,t go throw,

Dec 18, 2009 | 1994 Mercedes-Benz C-Class

1 Answer

My heat is not working. Its throwing out very cold air now. It happen before and i replace thermostat and blew air threw heater core. I blew air threw heater core the other day now its throwing out real...


It sounds like your heater core is stopped up, or be sure your coolant is flowing, and picking up heat from your engine...Thermostat, water pump, etc.

Jan 30, 2009 | 2000 Chevrolet Blazer

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