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Blower fan won't shut off - Cars & Trucks

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What make , model and year vehicle ?

Posted on Dec 30, 2016


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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 !

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Blower control won"t shut off


Need more info. Won't turn completely off when the car is running? Most fans will not completely turn off unless you turn the heat and air control to off. Or is it still running when you turn the engine off.

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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.

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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.

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After i change thebrake switch will my fan blower for my heater and ac start working agian


No it won't.The brake switch is for brake light,interlock shift solenoids,transmission TCC controls,and stoping the vehicle, You fan blower has a completely different power supply that is independant from the brake electrical system, For you fan blower to operate its either the fan resistor blower or the fans control switch to the fuse

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The heater/ac fan only works on speed settings 4 & 5


you might check your switch sounds like to me that your two lower speed sides of the switch maybe burnwed out.

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06 silverado blower fan won`t shut off finally killed battery


The connection at the blower resistor on these model years had problems with poor connections.
The increased resistance on the terminals caused them to heat up and burn. Some would go open circuit and not work at all and some would short to ground and run all the time, like yours.
As you have already discovered, you will need to replace the pieces.

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