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This is a very common problem. Most often the reason that a heater fan won't run on one of the speeds?æis corroded contacts in the wiring harness.
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Can you bypass the Blower Motor Resistor on a 1986 Ford Escort?
You will only have high speed fan
Why do you have the high speed only on the heater in your 1998 Ford Contour?
Bad blower resistor. I just replaced mine.
Heater only works on high speed?
The heater motor speed resister is burned out.
How do you fix the heater in Mercury Sable - Ford Taurus?
No one knows if:The heater is NOT blowing - or blowing on high speed only, or... The heater IS blowing, but the air is NOT hotEither way, the "Related Questions" below will get you started
Cause for low speeds on blower fan 1994 ford not to come on high speed works?
Resistor on the heater blower motor has failed
Heater motor only works on high speed in 2001 ford ranger?
Normally when a heater blower motor only works on the High setting, it is caused by a defective Blower Motor Resistor Pack. The fix is to, Replace it. In very rare instances it can also be a defective blower motor speed control switch, but rarely.
Why does Heater fan not work on high speed?
2004 Chevy express van, heater has no high speed, at one time the blower stayed on even when the ignoton was turned off therefor draining the battery,
Heater only works on high?
The blower motor speed resistor is burned out.
Your heater blower will just work on high speed?
The blower motor speed resistor is burned out. The high speed function bypasses the resistor. The speed resistor is generally located near to the blower motor.
Is there relay switch for heater fan?
Yes there is, but it only operates the high speed function.
Why does your heater blower only run on high?
The blower motor speed resistor is burned out.
Why does your Heater fan only blow on high speed?
Switch problem? Cables disconnected?
