Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1991 Ford Taurus L4-153 2.5L HSCFACTORY OEM SERVICE PROCEDURE
Fan Control Module
BLOWER SPEED CONTROLLER
The blower speed controller is located in the evaporator case, upstream of the evaporator core. The high blower relay is located on the upper half of the evaporator case. The relay converts low current signals from the control assembly to a high current, variable ground feed to the blower motor. The infinitely variable blower motor speed is controlled by the control assembly, as well as the position of the blend door actuator. A delay function allows a gradual increase or decrease in blower motor speed under all conditions.
The blower speed controller is located in the evaporator case, upstream of the evaporator core. The high blower relay is located on the upper half of the evaporator case. The relay converts low current signals from the control assembly to a high current, variable ground feed to the blower motor. The infinitely variable blower motor speed is controlled by the control assembly, as well as the position of the blend door actuator. A delay function allows a gradual increase or decrease in blower motor speed under all conditions.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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