An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert whose answer got voted for 100 times.
Re: blower motor will not work
Do further tests at the relay to ascertain whether the fault lies before or after the relay.
Check power availability at the supply side of the relay contacts - should have 12v from a supply fuse on one side of the normally open contact (note -this supply may only be available when Ign or Acc sw is on).
If power supply is ok at the relay contact, check control input to relay operate coil.
If a ground (or 12v) operates the relay, operate the relay with a local ground (or 12v) and check blower motor runs.
If all above OK, check control signal from fan switch is arriving at the relay control coil.- if not trace wiring back to the switch.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
To determine the cause of a blower fan failure, isolate the motor, and perform some basic electrical tests.Check fuses first. Fuse failure often causes component failure. Check for power at the motor itself. Test the connection to the blower motor. Test the switch.------------------------------------------------------------------- Car Diagnostic Tools
CHECK BLOWER MOTOR FUSE AND RELAY.IF ALL IS GOOD.BEST TO REMOVE BLOWER MOTOR HOTWIRE IT.IF DONT WORK REPLACE BLOWER MOTOR.IF BLOWER MOTOR WORKS.YOU HAVE FAULTY CONTROL SWITCH OR MODULE.BESURE TURN OFF RADIO FIRST YOU NEED TO REMOVE NEGATIVE BATTERY CABLE.WAIT 15 MINUTES BEFORE WORKING UNDER DASH.THIS WILL DISARM AIRBAG AND BCM UNDER DASH.YOUR BLOWER MOTOR UNDER DASH ON THE PASSENGER SIDE FAR TO BACK.YOU NEED TO REMOVE BOTTOM PANEL TO GET TO IT.
computer confused by cooling fan voltage/current level. Is the fan working? If yes, may have a short. If no, try hotwiring to battery to see if it's good. If fan works by hotwire, suspect relay is bad. Check all wiring before buying any parts. Relay does not click in until engine is hot. Let me know if you have more questions.
Check the blower motor speed control resistor pack is ok.
(The resistor pack is usually located in the blower fan ducting in the air flow).
Check condition of electrical connection terminals on the blower motor circuit - these terminals pass considerable current and over time may fatigue overheat and loosen.
Check operation/replace any blower motor control relay,
Check the blower motor will run if +12v directly applied to the blower motor.
Check operation of the blower motor speed control switch is ok.
YOU CAN STILL HAVE 12.5VOLTS ON WIRE,BUT ONLY HAVE 2 STRANDS OF WIRE CARRYING IT..WILL NOT CARRY ENOUGH CURRENT TO RUN MOTOR..CHECK WHITE MAIN CONNECTOR UNDER DASH NEAR BRAKE PEDAL..TAKE APART AND LOOK FOR MELTED WIRING..ALSO CHECK WIRING AT IGNITION SWITCH CONNECTOR..THERE WAS ALSO A RECALL ON BLOWER MOTOR WIRING FOR THESE TRUCKS..CALL YOUR LOCAL DEALER AND GIVE THEM YOU SERIAL NUMBER AND MILEAGE..YOUR TRUCK MAY HAVE FELL THRU THE CRACKS IF YOUR NOT THE ORIGINAL OWNER..LET ME KNOW WHAT YOU FIND
I've never seen a vehicle w/o a blower resistor. You don't need to remove the blower. The resistor is about 2 inches x 3 inches and is installed in a hole in the plenum (duct) near the blower motor. It will have a wiring harness connected to it. It could be under the passenger dash or under the hood, depending on where the blower motor is.