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Well, if your cooling system is checked out, and is in top condition, it is not losing coolant, and the car temp. is good........and possibly you have done something to it, because it was working before......then, you just might have air in the system. If you have changed any parts and just filled the rad. to the top, you have to burp it. If this is the case, drain some coolant, say about 1/2 to 3/4 of a gallon ( 4 to 6 liters ) run the engine till it gets warm with the rad cap off, wait till the thermostat opens and the coolant circulates, then start to add to fill to the top, when you do this open the heater with the fan blower on, check for hot air at the same time. AND, if this is not the case, then you have a blocked heater core, and if a rad. flush does not do the job, then you might have to change the heater core. Also, did you check to make sure the cable is working properly when you move it to heat, or if you have electronic, check to make sure it is working properly. Hope one of these is your answer. Good luck.
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∙ 15y ago
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