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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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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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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.

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

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

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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?

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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.

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2004 Chevrolet Silverado Heater/AC Blower on without Ignition ON


there is no relay for the heater fan it's a 15 amp fuse and is on the accessories circuit. the reostat is responsible for all 3 speeds .with the key off there should be no voltage to the blower motor whether the fans speed fan switch is on or off. the fuse will be located in the fuse paneleither on the drivers left side in the dash or underneath the dash in the fuse block. you have a short in the harness that is under the dash and most likely it's a bad plug on the harness. your going to have to do some searching but that's where the problem short is... please rate

Oct 03, 2008 | 2004 Chevrolet Silverado 1500 Crew Cab

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