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Q: Heater does not work on 1993 Ford Escort

All the heater does is blow cold air. It does not make a difference what temp it is set on. I know it is not low on coolant, blower works, and the A/C still works. I can not get hot air to blow.
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The heat in your car works by passing hot coolant through a small radiator under the dash called a heater core. There are several things that can go wrong to produce the symptoms you describe. The most common is that your radiator is low on coolant. Since the heater core is higher than the radiator, if the radiator is low, the first thing that get starved for coolant is usually the heater core. No hot coolant, no hot air in the cabin. You may also have a thermostat that is stuck open. If so, then the engine never really gets hot, which means the coolant never get hot. Again, no hot air. You heater core could be plugged up with gunk preventing coolant flow. The best way to answer these question to take your vehicle to a reputable repair shop for diagnosis. Good Luck
I just had to replace my cylinder head gasket and while I was at it I replaced my thermostat, so I know my coolant level is good and my thermostat is good.
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