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2004 Chrysler town and country automatic temp control.

Blower motor/ac/defrost is not working...
2004 Chrysler town and country automatic temp control. Blower motor/ac/defrost is not working in front however the blower on back window is working there. Mechanic said it was bad control head so replaced. still has same issue. What to check next?
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Answered in 20 minutes by:
3/25/2018
Mopar Certified
Mopar Certified, Dodge Technician
Category: Dodge
Satisfied Customers: 11,596
Experience: 24 Year Chrysler/Dodge Certified Specialist
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Welcome to JA my name is Mark,

A blower motor power module is used on this model when it is equipped with the optional Automatic Temperature Control (ATC) system.

The blower motor power module is mounted to the rear of the HVAC housing, directly behind the glove box opening in the instrument panel. The module consists of a molded plastic mounting plate with two integral connector receptacles. Concealed behind the mounting plate is the power module electronic circuitry and a large finned, heat sink. The blower motor power module is accessed for service by removing the glove box from the instrument panel.

The blower motor power module allows the microprocessor-based Automatic Temperature Control (ATC) heater-A/C control module to calculate and provide infinitely variable blower motor speeds based upon either manual blower switch input or the ATC programming using a Pulse Width Modulated (PWM) circuit strategy. The PWM voltage is applied to a comparator circuit which compares the PWM signal voltage to the blower motor feedback voltage. The resulting output drives the power module circuitry, which adjusts the voltage output received from the blower motor relay to change or maintain the desired blower speed.

Assuming all of your fuses have been checked, I would suggest replacing this power module.

When you are satisfied that I have answered your question, please provide a 5 star rating since this is how your expert is compensated for taking time out of their day to assist you. However, if you need any more info please reply back to me before you provide any rating, Thanks again!

Mopar Certified
Mopar Certified, Dodge Technician
Category: Dodge
Satisfied Customers: 11,596
Experience: 24 Year Chrysler/Dodge Certified Specialist
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Customer reply replied 4 months ago
Thank You. This was the solution.
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