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You need to get the blower motor resistor replaced.This is your problem.It is located by the blower motor.There will be a connector from the blower to the resistor.The resistor controls the fan speeds when you turn the knob on the control head.The blower motor is on the passengers side under the dash.Hope this helps.Good luck.
If you have a manual system, you have a resistor. If electronic, you have a blower motor speed controller. Please rate if this helps.
here is info:
Control System Outputs-Manual A/C Blower Motor Switch Resistor
The heater blower motor switch resistor has the following features:
The assembly is located on the evaporator housing in the engine compartment.
Three resistance elements are mounted on the resistor board to provide four blower motor speeds.
Depending on the heater blower motor switch position, series resistance is added or bypassed in the blower motor circuit to decrease or increase blower motor speed.
An overheating protective device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F) interrupting the blower motor operation in all speeds except HI.
The thermal limiter cannot be reset and is not serviceable.
Control System Outputs-EATC Blower Motor Speed Control
The blower speed control is located on the evaporator housing in the engine compartment.
The function of the blower motor speed control is to convert low power signals from the electronic automatic temperature control module to a high current, variable ground feed for the blower motor (18527).
The blower motor speed is infinitely variable and is controlled by the electronic automatic temperature control module software.
A delay function provides a gradual increase or decrease in blower motor speed under all conditions.
THE REASON THE BLOWER ONLY WORKA ON HIGH IS BECAUSE OF SOMETHING CALLED THE BLOWER MOTOR RESISTOR. THIS IS A BLOCK WITH ABOUT THREE DIFFERENT RESISTORS ON IT WHICH CONTROL THE AMOUNT OF VOLTAGE THAT REACHES THE BLOWER MOTOR THUS GIVING YOU YOUR DIFFERENT SPEEDS.
THIS BLOCK IS USUALLY LOACATED BEHIND THE GLOVE BOX AND IS BOLTED TO THE HEATER HOUSING.
Replace your blower motor resistor Resistor located under dash on passenger side in screwed into blower housing. May be able to be repaired. Requires soldering a small piece of "unmelted solder" across where the old fusible link was. look carefully at resistor. Or else just replace. Buy new. Junkyard resistor likely to be as bad as yours.
is located on the heater core and evaporator core housing near the blower motor.
has three resistor elements mounted on the resistor board to provide four blower motor speeds.
depending on the blower motor switch position, series resistance is added or bypassed in the blower motor circuit to decrease or increase blower motor speed.
has an overheating device (thermal limiter) that will open the resistor coil when the temperature reaches approximately 184°C (363°F) , interrupting the blower motor operation in all speeds except high.
is serviced as an assembly. The thermal limiter cannot be reset and is not serviceable.
Lower the glove compartment.
Remove the screws and position aside the 4x4 control module.
Remove the blower motor resistor.
Disconnect the electrical connector.
Remove the screws and the blower motor resistor.