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Have you checked voltage and ground for blower motor? in the diagram, the top wire at blower motor is voltage. The purple wire, bottom wire from blower motor is ground. You can see blower fuse at the top, hot all the time. The blower motor on/off, different speeds are controlled on the ground circuit. You can take two wire connector loose from blower motor, use both ends of test lite at wiring connector terminals, turn on key, turn on hvac and blower controls, if the lite comes on, you have voltage and ground. If good voltage and ground with no blower action, suspect the blower motor. I couldn't post whole diagram and make it readable. The problem could be almost anywhere, with the wiring? I can only help with testing. good luck
The A/C line's , the compressor etc. wouldn't have anything to with the blower motor working intermittently . electrical power supply problem . Looking at wiring diagrams to see what all is involved in making the blower motor work would be the first step in diagnosing the problem . Knowing GM vehicle's i would say the blower control module is starting to go bad . GMC Yukon HVAC Blower Motor Won Turn On This is the same on your chevy .
Blower motor control module , maybe. The HVAC control panel sends a PWM - pulse width modulation control .
HVAC Blower Motor Circuithttp://www.bbbind.com/free-tsb free wiring diagrams . Enter vehicle info. year , make , model an engine . Under system click on HVAC ,then under subsystem click on HVAC controls . Click the search button , then the second blue link . Blower motor control diagram . Suggest you take it to a qualified repair shop if you don't know how to diagnose electrical systems on automobiles
What make , model an year vehicle ? Probably blower motor or blower motor resistor or could be a control processor . But those are just guesses . Testing the blower motor electrical circuit is the proper way to a fix . Do you know how to do automotive electrical systems testing using a DVOM - digital volt ohm meter ? How to read an use a wiring diagram to pin point places in a wiring circuit to do testing at ? Blower Motor Problems Auto Repair Help
That is the heater / AC blower motor ! There are electrical circuits and relays and blower motor resistor , blower motor etc... Electrical testing is the way to diagnose blower motor circuit . Looking at a wiring diagram to see what controls the blower motor on your particular vehicle would be the first step in diagnosing your problem . Do you know how to do automotive electrical testing , how to read or follow a wiring diagram ? Videos on youtube show how to test blower motor and related parts and wiring . Blower Motor and Resistor Diagnostics by Wells
The most common problem would be a bad blower at which you can test for power at the motor connector with a testlight, the other most common problem is the resisitor ,theres one for the front blower and one for the rear blower, you may have a bad resisitor for the rear blower this resistor is located next to blower.theres also arelay in the fuse/relay box next to the battery under the hood,the best thing is to start testing for ower at the switch and work your way to resistor, i think you will find a bad resistor to rear blower motor.heres a complete wiring diagram of the whole front and rear heat and ac unit, everything is labeled good luck.
What is wrong with it? Motor not working? Check the connector that plugs into the blower motor. You may need to replace it. They all give trouble there.
it is either a bad switch or window motor. finding a wiring diagram and shooting power to the correct wire will identify whether the switch or motor is faulty.
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