Question about 2003 Chevrolet Silverado Ss

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Blower motor won't shut off when I turn the truck off, and it can't control the fan speed on a 2003 2500HD

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UNPLUG THE FUSE AND REPLACE YOUR BLOWER MOTOR SWITCH.

Posted on Jan 17, 2009

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Posted on Jan 02, 2017

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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 ?
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Test the electrical circuits ! Manual HVAC or automatic HVAC ?
Do you know the difference ? Heater / A/C blower motor electrical control diffrent . Manual has resistors an a relay for different speeds , automatic has a blower motor control module .Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info year , make , model and engine size . Under system click on HVAC ,then under subsystem HVAC controls will pop up . Click the search button , then the blue links . First off you need to know what system yours has , manual or automatic.
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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
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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.

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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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your car is possesed treat it good it will treat you good. dont worry the only time my car will start is when a chick turns the key my car is a **** lol.

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