Question about 1999 GMC Jimmy

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Put new theromostat,new radiator on blows out cold air through all vents but dont get hot

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Bleed all air out of system.Any air trapped will stop circulation and you want get heater to blow warm air.You could have a slight leak in your head gasket causing air to get into the system.Make sure the water pump is working properly.I have had some with the impeller has snapped off.so checking that if all else fails would not be a bad thing

Posted on Dec 30, 2010

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Hi

Have you bled the system through ? all the air out ?
there are a few things that ca ause this air being traped is the most common, secondly the heater control for the cabin may have failed, you can normally tell if this is the issue as the car would not overheat but you wont get hot air.

The other option is the heater core may have failed or be blocked up, the can burst and so you get water inside the car, often they do hold but again the car would not overheat but it would get a little hotter and possibly idle faster.

Hope this helps

Regards

Dan

Posted on Dec 30, 2010

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