Question about 2002 GMC Sonoma Extended Cab

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No heat at all coming out of the heater!!

Replaced the thermostat...still no heat...upper radiator hose is hot..but the lower radiator is not...just warm...there are no leaks anywhere...or any odor smell of antifreeze..truck is a 4.3 litre V6 with A/C.Engine runs at normal operating temperature.

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  • GMC Master
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These trucks are famous for plugged heatercores,what you do is,remove both hoses to heatercore at firewall, mark there location, next cut two peices of heater hose, about 12 inches long, slide on the heatercore where the hoses where, then use a water hose and flush in both directions a few times, then you should have heat, also if its been a while i would also have the cooling system flushed out, hope this helps. good luck.

Posted on May 04, 2010

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  • Master
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Sounds like you have an airpocket in the system open the radiator (take cap off) while car is cold start the engine until you reach operating temp look into the mouth of the radiator you should be able to see the coolant moving if not you will need to bleed your system. you should have on or near the thermostat a bleeder valve if so equipped turn counterclockwise until coolant flows in a steady stream once you get a steady stream retighten you should now have heat if you dont have a bleeder vavle then you will have to let the thermo open on its on with the cap off and thid will push all air out.

Posted on May 04, 2010

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Posted on Jan 02, 2017

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