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The HI fan comes from the "HI BLO MOT" Fuse 53 (30amp) Located in the underhood fuse box- there is also a blower HVAC relay located in there. The LO and MED settings are ran though the HVAC relay to the Blower resistor pack(Below right side of dash) then to the speed selector switch on the dash. HVAC Blower Fuse D supplies power to the speed selector switch and is located in the right instrument panel fuse box located behind right side of dash.
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The blower motor control processor is going out . The blower motor is controlled electronically .
The fuse for this is located in the rear fuse box , under the box seat . HVAC BLO fuse 40amp
Heater not working ??? blower motor not moving any air in the system !
Blower motor relay located in the under hood fuse / relay box. Fuse F18 -40 amp - fuse F93 5 amp under hood fuse box . Also has blower motor speed controller that is controlled by the HVAC module . This problem is probably from a bad speed control module . Want to view the wiring diagrams ? Free here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make ,model an engine size . Under system click on HVAC then under subsystem HVAC controls . Click the search button then the blue link . HVAC Blower Motor Circuit
Doesn't work on any speed ? high - low . Does your's have manual or automatic climate control ?
Don't think a fuse problem , blower motor control processor more then likely .
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.
Look here for fuse location an wiring diagram's http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size. Under system click on HVAC , subsystem HVAC controls . click the search button then click on the 5th blue link . This show's fuse location an wiring diagram for the blower electrical circuit . If you don't know where the rear fuse box is ,it's under the rear seat . It would be easier to just check under the passanger side dash at the blower motor control processor at the orange wire .
Do you know how to test electrical circuits with a voltmeter ?
The main temp sensor that can cause this problem is called a aspirator. The Aspirator and the fan is located under the grill in the head liner above the drivers seat.
The first step in trouble shooting is to scan for fault codes. AutoZone may provide a free scan if you have one of their retail outlets close to your location.
Try this:
With the ignition key in the off position remove all fuses identified for the HVAC,Heater,AC in the fuse boxes located in the passenger compartment and the under hood fuse boxes.
Wait for a few minutes and then reinstall the fuses to their correct locations ( Take a quick picture of the fuse boxes before removing them.)
Turn on the key without starting the engine (do not change any heater or ac settings) Wait a minute or two and then start the engine to confirm proper operation. if the heater and ac operate properly all is well..if not the HVAC scan will provide a starting point to isolate your problem.
Do you have The Automatic or Manual HVAC system ? Doesn't matter fuse's are the same ! Out in the under hood fuse / relay box are two fuse's for heater HVAC BATT fuse #39 10 amp an # 70 40 amp . HVAC BLWR . HVAC = heater ventilation an air conditioning ! So Tom what problem are you having ? Heater fan not working ? There is also a blower motor control module involved !
There are two fuse boxes on is located under the hood and the other is located on the side of the dash board on the passenger side. The owners manual will help you locate the fuse or relay
FIRST CHECK HVAC FUSE AND BLOWER MOTOR FUSE AND RELAY.IF BOTH CHECK OUT OKAY PROBLEM COULD BE HVAC CONTROL SWITCH OR MODULE OR THE BLOWER MOTOR IS BAD.TO KEEP FROM SPENDING ALOT OF MONEY.THE HVAC CONTROL MODULE CONTROL SWITCH VERY EXPENSIVE.IT COULD COST $300.00 TO $400.00 DOLLARS.WHAT I WOULD DO IS REMOVE BLOWER MOTOR IN THE LEFT REAR TRIM PANEL.HOT WIRE TO BATTERY USING JUMPER WIRES.IF BLOWER MOTOR RUNS ITS THE HVAC SWITCH.IF BLOWER MOTOR DONT RUN REPLACE IT.IF THE HVAC IS BAD BEST FOR DEALERSHIP TO CHECK IT OUT.BECAUSE YOUR DASH HAS AIR BAGS IN IT. WHICH WOULD BE DANGEROUS.
There is a blower motor resistor located up under the passenger side dash. I believe there is actually 3 fuses that can cause problems with the blower....relays/fuses should be located in the engine compartment fuse block. They are High Blower fuse-HVAC fuse-Radio/HVAC/RFA/Cluster/etc...fuse. Hope this helps.
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