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When i am at an idle, my heater goes cold, it is REAL cold here today

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Make, model, year, engine? Cool air from heater on idle is a good indication that you have either restricted flow to, or through heater core, either from partially plugged core, restriction in lines to & from core, or possible weak water pump, but my money's on partially plugged core. Having your heater core flushed & reversed flushed, may be all thats needed, which is usually the case. There is the possibility of a vacuum leak, if you recently started to hear any hissing noises by chance. If you are mechanically inclined at all, you can probably to the core flush yourself.

Posted on Jan 16, 2009

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