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Heater Cores and Blower Fans
Ford Explorer Limited
Car Heaters

Why would heater only blow hot air when you turn the temp switch down Replaced temp switch and still does it?

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Wiki User
2014-02-15 01:12:41
2014-02-15 01:12:41

A restricted/plugged heater core can do that. Try flushing the heater core.

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== == The heater fan is electrically driven, so the fault will be either a loose wire connection, or the heater fan switch needs to be replaced. Have a licensed mechanic test the wiring and the switch function to find the fault and then repair it.

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Was the gasket replaced? Have you checked the hose and the heater core. Is everything tightened down?

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Do you mean that the heater will not shut down either by turning the thermostat down or turning the switch off. If turning the pump off will not shut down the heater it could possibly be one of the high limits or the gas valve has failed in the open position. If the heater will not fire when calling for heat then one or more components has failed. k

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I had the same thing happen on a 2000 Stratus and it ended up being a bad heater blower control switch. I replaced the unit and everything worked great.Answeri belive this would be a bad blower motor resistor check that because you car has two resistors for the heater one which controls low med and med hi and the other control only high for safety reasons basically so if you need to defrost your not left with out heat

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There are two things that can be checked to find out. The first is the relay that runs the blower motor may need replaced and the second is the motor itself needs replaced.

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For most GM trucks or SUV's, it's under/behind the glove box. But the most GM motors do not have multiple speed capacity. That is usually a function of the switch. Many of the GM multi speed vehicles use the heater function switch assembly to control motor speed. Unfortunately, many of them are "solid state" and require that the entire heater function switch be replaced when something goes bad.

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The heater valve could be failing to open for one reason or another.

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Check fuse if the blower is not working. If it is then replace your heater core. if its not then replace your fan switch.

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Fuse, switch, speed resistor or motor.


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