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the heater resistor needs to be replaced it is mounted in the heater box next to the blower motor

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Q: Why does your blower motor only run on high?
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Why does your heater blower only run on high?

The blower motor speed resistor is burned out.


Why does the heater blower only work on high?

from what i have read it is the blower motor resistor it goes bad and only lets the fan run on high google blower motor resistor and read on


Does blower motor relay make fan run?

A typical blower motor relay only operates the high speed function.


Why does heater blower on 1992 s10 run on high only?

Probably the blower motor resistor is shot.


What causes the blower motor to run only on the high setting on a 2003 Nissan Xterra?

The blower motor speed resistor is probably burned out.


Why does the ACHeater blower only run on high in your '96 Chevy Cavalier?

Blower motor resistor is bad. It is a little circuit board with resistors on it that changes voltage to the blower motor. When it goes bad, you get full speed only.


Why does Oldsmobile Intrigue blower run only on high speed?

because the blower motor is no good, for some reason it get damp in the blower motor chamber, and slowly the speeds start to go one by one until you just have high.


Why does your heater fan run on high only in your 2007 Chevy Cobalt?

Blower motor resistor defective


What would cause your blower motor to only run on high in your Chevy Express?

The blower motor speed resistor is burned out. The resistor is located close to the blower motor and is easy to change. Your local auto parts store will have that part for you.


Why does the front blower only work on high setting but not low or medium on 2002 Chrysler Town and Country?

When the fan is on high it does not run through the blower motor resistor. The low speeds don't work because the blower motor resistor is bad.


What would cause my blower motor to only run at high speed on my 1998 Chevy Express?

The blower motor speed resistor is burned out. The resistor is usually found close to the blower motor. Auto parts stores carry that part and it is easy to replace.


What is a blower?

There isn't a transistor but there is a blower motor resistor. The purpose of it is to control fan speeds. Normally when it goes bad it will let the fan run on high only. It is located under the dash on the passenger's side near the blower motor.