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My heater blower motor quit working . it will run if i put juice to it directly and the fuse is good . what else could it be

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It should have a resistor unit
make sure when you turn the blower motor on/off the power is toggling
then check if the wires going to the motor are getting power when you turn the blower switch on/off
actually since you already have the connector off try the later first.

Posted on Jan 01, 2011

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I don't have a diagram for a 2008. On 2005 models the blower motor relay gets power from a 30amp fuse.
When the blower switch is in the high position the resistor is bypassed and power flows directly to the motor. The motor is grounded to the car.
The fan relay also gets power from a 7.5amp fuse and is controlled by the HVAC control on the dash.
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INSTRUMENT CLUSTER AND BLOWER MOTOR QUIT TOGETHER.


Belief it or not your problem may be at one off your electric fans, also a possibility your a/c compressor coil shorted, so disconnect your a/c condenser fan and your a/c compressor check them for short and replace has needed, here is the logic every time you turn your heater on defrost it will cycle your a/c and it will blow your fuse, there is a circuit breaker on fuse box by left kick panel way up make sure it is in good condition push on it and you will feel it click if trigger, is not spring back it may be at fault to, replace it. good luck

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REMOVE HEATER BLOWER MOTOR HOT WIRE BLOWER MOTOR IT.IF IT WORKS.YOUR AC AND HEATER CONTROL SWITCH IS FAULTY.CHECK HVAC FUSES AND CHECK BLOWER MOTOR RELAY.IF BLOWER MOTOR DONT WORK WHEN HOT WIRE REPLACE IT.IF ALL CHECK OUT GOOD.HAVE DEALERSHIP DO A DIAGNOSTIC TEST ON YOUR CLIMATE CONTROL SYSTEM.

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2002 f150 heater blower quit working all of a sudden. fuses check out okay. no juice at switch plug with the key on.


The cab fuse panel, fuse #22 is only hot in the run position, and this is the white w/ violet stripe wire at the connector on the HVAC panel on the manual temp ( vs the EATC HVAC ).

The switch in any of the positions, powers the Brown w/ Orange stripe wire wire to the blower relay ( by the flasher in the relay block under the dash by the steering wheel column, usually covered in black tape from the factory ).

The blower relay powers the blower motor resistor, to know what speed to run at, this is powered from the engine fuse panel, fuse #105 ( 40A ).

If you do not have power on the white w/ violet stripe wire at the back of the HVAC switch panel, you need to meter both sides of fuse #22, to confirm power is through the fuse.

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2 Answers

91 Volkswagen Jetta. Blower problem or fuse box problem.


sounds like somebody had the wrong fuse rating and now has burnt the blower motor out,roady932

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1 Answer

1999 jeep grand cherokee heater fan quit. 40amp fuse under hood good. both wires at motor test hot. motor turns strong when wired direct to battery. now what?


the blower motor resistor is bad replace it and it will work good as new the resistor is located in the same heater box as the blower motor mounted on the outside of the heater box follow the wirring from the blower motor to find it or just simply buy the part and match it up

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1 Answer

Yes i have juice to the blower motor, but it dont blow all fuses are good, freon is good


Cadillac 1999 DeVille
If the front blower motor is not running with battery level power to it, you may have bad blower resistors which controls the speed of the motor.. Unfortunately the resistors are built-in the motor. You may have to replace the motor. If you remove the motor, you can recheck it by direct wiring power to it. OR you may have loose wires.
Also check the Heater and A/C Programmer module.

Here's some info I found from another posting.

Red is positive 12 volts coming from fuse of circuit breaker. The black wire is either the ground or the main hot wire going to the blower motor (3 pin connection only), and the gray wire (if is is small in size) is a variable voltage coming from the body control module requesting speed for the blower motor.The blower control module varies voltage on the main wire going to the blower motor, supposedly in accordance with the requested voltage from the body control module. Usually if all fuses are okay and present on the apprpriate wire of the blower control module, the a blower motor that will not run or stays running after the key is turned off is the fault of the blower control module. If the blower control module has failed the the cause must be determined (over amping blower motor) or else new blower control module may fail when powered up.Usually blower control modules have more than three wires. Usual connections are: B+ (battery voltage) GND (chassis or engine ground), two large wires going directly to blower motor (can be any color, but are usually 10 guage in size), and an optional wire that reports voltage level back to the body control module.

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2 Answers

Heater works but fan doesnt work


on the inside of the fuse box door there is a list of what each fuse is for, fuses will be numbered with coresponding numbers and explanation of what there for. also if fuse is ok, chanses are its the resister, its located behind glove box on top of heater box 2 screws hold it in heater box, electric plug with 4 or 5 wires going to it. i just went thru this with my 1995 chevy 1500 pick up. but before you go thru that chk. fuse, chk motor, run 12 volts direct to motor see if it works. now did the motor just quit? or did it work on a couple of speeds before it quit? well at any rate if the motor runs when 12 volts are put to it odds are its the heater resister.

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