Where is resistor for blower motor

Share Share. Burned-out blower motor resistor pulled off a Ford E van. Remove and clean blower motor fan Replace air cabin filter Remove and clean your blower motor fan to prevent future HVAC issues. How to Replace a Blower Motor Resistor The blower motor resistor is usually extremely easy to access, but the hard part can be positioning your body inside the car to remove the part. Step 1 : Remove the glove box door, if necessary. Step 2 : Disconnect the wiring harness and remove screws.

Step 3 : Remove and replace the blower motor resistor. Step 4 : Tighten screws and reattach wiring harness. Step 5 : Reinstall the glove box door. Stay Cool! Jeffrey N. Previous Post. Next article. Disconnect the wire harness connector on the resistor using the small flat-head screwdriver. Use the Phillips screwdriver to remove the two screws holding the resistor to the bottom of the heater box. Remove the resistor, and then install the new one.

Tighten the screws and reconnect the harness connector until you hear it click. Mike Vasick has more than 25 yrs in the auto repair industry. He is factory-certified for repair on Nissan and Subaru vehicles. Excessive blower motor amperage due to a faulty blower motor or restricted cabin air filter should also be considered or possibly replaced to prevent repeat failures.

More recently, blower motor speeds are controlled using different methods. Most manufacturers have moved from simple resistor circuits to electronic control modules and solid state controls. The following guidelines are provided to help in the understanding how blower motor speeds are controlled and testing of blower motor control circuits.

It is always recommended to refer to service information for the specific vehicle you are working on.

The use an inductive amp clamp to verify that the blower motor current draw is not excessive. Worn out blower motors can cause excessive current. If the current is too high, replace the blower motor. This excessive amperage will cause the new blower motor control assembly to fail again. A guideline number for maximum amperage on high speed is Approximately 15 to 20 amps.

Specific vehicle applications information should be verified. Power Tip — This possible repeat failure typically occurs during testing when we are looking to verify if our diagnosis is correct.