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Re: Location of the blower motor control module
The module is located in the ducting for the heater and is accessed from the passenger area of the front seat. I think it is just under the dash but you may have to remove the glove box. it is a rectangular item held in with four screws. and should have two connectors going to it. You have to be sure to get the right replacement if you r replacing it. thanks.
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The blower motor does not operate correctly - manual climate control
A/C blower motor resistor
A/C blower motor switch
Blower motor high speed relay
Go To Pinpoint Test O .
The blower motor does not operate correctly - EATC
A/C blower motor speed control
Go To Pinpoint Test Q .
Pinpoint Test Q: The Blower Motor Does Not Operate Correctly - EATC
Under normal operation, the blower motor control module receives a 1-2 volt signal from the EATC module through circuit CH218 (GN/VT) to determine the desired blower motor speed. The EATC module receives a feedback voltage from the blower motor control module through circuit VH219 (GY) to determine actual blower motor speed. When the highest blower motor setting is selected, the EATC module sends 12 volts to the blower control module through circuit CH217 (BN).
An open, short to voltage, ground or together in circuits CH218 (GN/VT), VH219 (GY) or circuit CH217 (BN)
Blower motor control module
If automatic HVAC system i would suspect Blower motor control module .
Automatic climate control? The HVAC control module is the part with the buttons that control the heater in the dash.
The first thing I would do is access the blower motor. With key on and/or the engine running wiggle the connector at the blower motor. It you get the same symptom than replace the blower motor. I run into quite a few of these with this symptom.
If the blower motor only works on high mode, then its problem with blower motor resistor.
The blower motor resistor needs to be replaced.This will make blower motor work on all modes.
I am going to assume that you have the Automatic climate control on your car. it gives you an auto fan mode, and temperature options. Often the problem does not lie in the blower motor, but rather, the climate control module. Often, the blower motor only works on Auto fan mode, or on full out. It will often also only operate in certain modes, such as only in defrost mode, or panel. I have had several town cars and Grand Marquies of these era's and have had the same problems with 2 of these cars. The only good solution to the issue is to replace the climate control module, which is the panel with all of the switches for the heater controls. If you're really adventurous or cannot find the replacement part, it may be possible to hard wire the fan to a multi resistance switch, but you really got to know what you're doing.
if you have manual control climate control then the system has a blower motor resistor . if you have automatic climate control then the system has a blower motor speed control. in eather case the part is under the dash in the heater box. depending on the system you have, buy the part and then look under the dash for like part, you will half to remove the under dash panels to be able to see. the part will be on the heater box somewhare.