heating system

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my heat blows out cold air i flushe dthe radiator and changed the thermostst still no good friends said its not the heater core cause i would be leaking if it was so i dont know what it is and i live in nyc its getting cold out i also checked the fuses please someone help with this the ac works fine but when i put on the heat it blows cold air

user50689 in Elmhurst NY

·

Oct 12, 2009

·

2 Replies

Popular Answer
Oakmanon Oct 16, 2009

The first step would be to check for proper coolant flow through the heater core. With the the engine warm touch both heater hoses, both should be warm. If only the inlet hose is warm then there is a coolant flow issue - possibly a plugged heater core. If both heater hosed are warm coolant flow is OK and the problem is with the heater control inside the car. Find the cable from the heater control on the dash to the temperature door in the heater box and make sure the temperature door is moving when you adjust the temperature on the dash.

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user50689on Oct 20, 2009

thanks oakman well i pelled off the 2 hoses and tried to shoot some water through one with a garden hose and it just bearly trickled out of the other end and yes the return flow hose was not as warm as the other hose it was actually cold so today im off and i will try to remove the hoses to see if there clogged i can see how they are because prior to flushing the radiator there was alot of sludge on the radiator cap it looked like black mud ill let you know how it goes thanks for your help

user50689on Oct 20, 2009

FLUSHED IT OUT WITH A GARDEN HOSE IT TOOK AWHILE BUT A GUSH OF DIRTY ANTFREEZE FINALLY GUSHED OUT WITH BLACK SUT I NOW HAVE HEAT BUT IT GOT WARM THEN COLD THEN HOT AGAIN I THINK I HAVE TO DO IT 1 MORE TIME BUT THATS THE TRICK

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some guyon Dec 6, 2009

give the man (the "Oakman") a cigar, or at least a five star rating. crud in the coolant can be from lack of service, addatives that are detrimental or using incompatable coolants. mixing green and pink coolant can cause cooling system clogging.

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