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HEATER BLOWER FAN SPEED FLUCTUATES WITHOUT ADJUSTMENT OF CONTROL BUTTONS

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Faulty blower motor resistor
short behind climate button array

Posted on Jan 12, 2009

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Posted on Jan 02, 2017

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Heater / air conditioner fan control doesn't engage fan. Previously, it only worked in high speed.


I would replace the blower motor resistor first then see if that corrects this. The resistor is located next to the blower motor under the dash.

Jul 16, 2012 | Cars & Trucks

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How To Replace AC Heater Blower Motor Fan Speed Control Resistor Accord 98-02...


How To Install Replace AC Heater Blower Motor Fan Speed Control Resistor Accord 98-02 1AAuto.com<br /><a href="http://www.1aauto.com/1A/ACCondenserFanAssemblies/Honda/Accord/-/-/2000?utm_source=fixya&utm_medium=forum&utm_campaign=1ATony"><br />This part is available on 1aauto.com</a><br /><br /><utube src="vRs1JJ42Eg0"><br />

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Heater and airconditioner control on mercery grand marquis


If the fan will not run on ANY speed in your Grand Marquis, the problem is most likely NOT the control switch.

Check for power and ground at the blower motor connector. If power and ground is present, replace the blower motor. Otherwise, the problem is most likely a failed blower speed control module (VERY common). The blower motor speed controller is located in the A/C evaporator housing just below the heater hoses.

Note: It is also common for a bad blower motor to CAUSE the controller to go bad. You MAY have to replace BOTH.

May 17, 2012 | 2001 Mercury Grand Marquis

1 Answer

Heater blower motor.,Highspeed only works..problem??


9 out of 10 times its the heater fan resistor doing this. it has wires that corresponed to diffreent speed settings for heater fan. the resistor is beside the blower motor, Your Kia Sportage Blower Motor Resistor controls the heating equipment in the vehicle by opening and closing the fan motor. The Kia Sportage Blower Motor Resistor allows the heating and climate control system to control the speed of the vehicle's cooling fan. its under the passenger side glove box. undo 2 screws and disconnect the electrical connector. thats it!!

Jan 24, 2012 | 2000 Kia Sportage

1 Answer

The heater fan won't stop, even if i turn off the key the fan still turn, unable to control it, it only turn at one speed (not the fastest one), i check the resistor it look like there's a short in it, the...


Your impala doesn't have a resistor , it has a blower motor control processor and it doesn't work the way you think it does
Chevy Trailblazer EXT Blower Motor Won Turn Off
Blower Motor Control Processor
The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a PWM signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.

HVAC Blower Motor Circuit

May 27, 2017 | Chevrolet Impala Cars & Trucks

1 Answer

How to fix a heater fan speed control


this sounds like you need a new blower motor, check fuses first if not blown replace blower motor

Apr 18, 2010 | 1992 Oldsmobile Cutlass Ciera

1 Answer

Heater blower fluctuates. What are the possible


your altnator is not pushing enough or your switch is burning out,

Oct 24, 2009 | 1998 Buick LeSabre

1 Answer

Heater fan wont work on high speed 1999 buick lesabre


check the high speed fan relay ? cant remember without looking at it but some of these buicks had a blower control module mounted in the evap housing that could fail?

Aug 28, 2009 | 1995 Buick LeSabre

1 Answer

A/C blower problem


I replaced the power control module. The module is located, electrically speaking, between the A/C head unit and the blower. Physically it is behind/under the glove compartment in the air ducting for cooling. The GM parts counter charged me ~$140.

Jun 05, 2009 | 2003 Chevrolet TrailBlazer

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