A restricted/plugged heater core can do that. Try flushing the heater core.
Early Previas, prior to 1994, were notorious for overheating the heater switch and melting the plastic casing. Once melted, the plastic would interfere with the switch lever movement and would glue itself in the last positon set. Forcing the switch, may restore some of the blower speed positions, but usually just open circuits and must be replaced for a very high cost of labor.
HeaterYou might need a new thermostat or heater core.Lincoln put a thermal switch in the hoses that run to the heater core in cars of this age. This switch would not allow the blower motor to run until the coolant was warm. This was a "luxury" feature to keep the heater from blowing cold air on your feet. After a few years these switchs would go bad. This could be your problem. I have replaced mine once and I'm looking into a way to bypass it. You can just use the vent function with heat to keep warm until you replace the switch, that's what I'm doing for now. I believe the switch runs about $50 from FoMoCo. You could also have the problems listed in the other answer.my Lincoln town car doesn't have the switch in the heater hose , now where do i look i have good AC but no hot air , where is the vac moter for the heater to outside air switch located ??1994 a breed by its self ?? ill just bet
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
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
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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