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2004 CHEVROLET IMPALA LS 3.8L 231cid V6 FI (K)
Blower Motor Resistor

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Diagnosis and Part Selection Advice:

How did you know this part needed replacement? Why did you choose a certain brand/part number?
The blower motor continued to run even when the car was shut off and the key was removed from the ignition. I checked the schematic diagram for the blower motor and suspected that if the blower motor relay contacts were welded closed, this condition would cause this symptom. I checked the blower motor control module (this is called the resistor module) with an ohm meter and the meter confirmed that the module was shorted on all the time thus confirming what I had suspected.






Part Comments

What came in the box? Were additional nuts, bolts, sealant, etc. needed for the repair?
The blower motor resistor module is a misnomer. It is actually a complex circuit board with a power transistor which switches on and controls the speed of the blower motor.







Repair / Installation tips:

Special tools needed? Have to remove other parts to reach this one? Any left-hand threads, sharp edges, messy fluids or other pitfalls to avoid?
First remove the 30A fuse from the fuse holder located next to the passenger side shock tower in the engine compartment. To get to the blower motor resistor module, you must remove the plastic cover located directly under the glove box. To do this, there are two latches and a plastic push pin that must be removed. The blower motor resistor module is then exposed and is located under the dashboard right next to the firewall. Assuming that this is the first time the module has ever been replaced, there are two plastic rivets, holding the module against the air duct, that must be ground off with a small rotary rasp. The module can then be removed for easier access. Detach the 5-pin electrical wiring connector from the module.

To install the new module, install two new steel screws (for sheet steel work) about 5/8" long through opposite corners of the new module and into the plastic stand-offs molded into the airduct for just this purpose. A special ratcheting right angled screwdriver was purchased for this job because of the limited space between the firewall and the module. Once the new module is securely in place, attach the 5-pin electrical wiring connector to the new module, re-install the plastic cover, and the 30A fuse into the fuse holder.