why does my car heater blows warm and then cold
i have a 2002 honda civic 1.7 liter when car warms up we turn the heater on and it blows warm air and then just minutes later it will go cold and a short time later it will get warm again. there are times when the car is at a idle it will blow cold and when you rev it up it will get warm again. i checked all fluids and they are full and also changed heater contol.the car does not seem to be overheating. any answers
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