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The main blower won't kick on ? - Cars & Trucks

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  • yadayada
    yadayada Dec 16, 2016

    Need the make, model year and engine of the car or truck??

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Missing variable control voltage on the blower fan control module on a 2008 Buick lucerne


What are you using to test this control signal ? Were you on right wire ?
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 pulse width modulation (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.

Chevy Trailblazer EXT Blower Motor Won Turn Off The blower motor in this video don't shut off , but he show's how to test the PWM signal right !
Your blower motor control module is probably bad , or HVAC control panel is bad , or a wiring problem !

Sep 26, 2016 | 2008 Buick Lucerne CXL

1 Answer

Wiper dont work speedometer dont work radio and heat blower dont work rpm gage drives between 3-4 bright lights dont work automatic windows and locks dont work


sounds like might b a main fuse. do u have a kick panel and a box under the hood? sometimes a main relay or fuse will cause many electric things to go out.

Mar 26, 2014 | 2001 Chrysler Town & Country

1 Answer

94 Buick Roadmaster AC fan blowing hot and won't shut off


If you have climate control it could be the main processor. Something could be shorting the blower relay to keep it on. You would also need to check and see if the system is still full of freon.

Jul 06, 2013 | Cars & Trucks

1 Answer

1994 SLS climate control blower won't work


You have relays, fuses and the control itself. Could be any or all of the above.

Jan 27, 2013 | Cars & Trucks

1 Answer

Fix fan relay


In most of the cases fan relay is in the blower casing and it controls the speed of the fan and if defective, fan won't work. Check on sides of the blower housing under the dash and you will see blower wires connected through this relay/controller.

Apr 07, 2012 | 2006 Ford Bantam 1.3i

1 Answer

Where is the main computer located in my 92 mitsubishi expo


moz-screenshot-2.png ECU Location 41943419
Hope this helps, it it does please leave feedback Thank You and Good Luck

Located under the dash, behind the RH kick panel and the blower motor.

Jan 01, 2011 | 1992 Mitsubishi Expo

1 Answer

Let's say when i want to use my a/c or heater at times the blower doesn't blow. so i leave the blower on a certain level,(usually high so i know when it kicks on) then it will work and other times mainly...


U need to replace the blower motor speed control resistor, it is located near the blower motor plugged into the air ducting for cooling of the resistor, it is held in by two screws

Oct 25, 2010 | Ford Explorer Cars & Trucks

2 Answers

If I need to replace the blower motor for my 2001 Ford Expedition air conditioner, does the entire dash have to be removed to reach it?


If you are removing the main blower motor at the passenger side of the cabin then you don't have to remove the dash. It's behind the lower dash trim panel and takes about an hour and a half to two hours to do. Not to bad a job but you will need to be a bit flexible to see under there.

Jun 08, 2010 | 2001 Ford Expedition

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