1998 Chev Truck. The blower motor is not working correctly. Sometimes it only works in high, sometimes it does not work at all, and sometimes everything works. The blower stopped opporating, while driving it came on in the high position, when I turned it down it turned off. Then it would not come back on in the high position. While still driving it came on in the high position. Then for a week, all positions were working, now I am back to the high position only, or nothing. How do I fix the problem?
I had the same problem with mine it was the selector but you have to change the whole unit i picked one up from a wrecker for fifty bucks check the back of yours mine had a bunch of wires that were coroded
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Sounds like a plugged evaporator core. The blower motor in located under the dash on the passenger side, behind the glove box. Some models have a trim molding which will unbolt for access. Once you have removed the blower motor, look inside the duct work and see if dirt, paper, ect has plugged the evaporator core. Sometimes a small vacuum cleaner will be able to **** out the debris.
If the blower motor not blowing,and it is on high, bump the lower motor to see if it will try and start working again,if it does,replace the blower motor.If it does not,then replace the blower relay.If this only happens on the lower speeds,replace the blower motor resister,witch is mounted very near the blower motor in the blower box,with two screws,and about 7 wires going to it.
Ok, first off, check the fuses under the dash. If they're all good, does the blower work only on high speed? If yes, then you have a bad blower motor resistor, which is located under the hood, near the blower motor itself. If the motor doesnt work at all at any fan speed, make sure the wiring harness that plugs into the motor under the hood is clean and tightly installed. If it still doesnt operate, sometimes tapping on the blower motor housing will kick it on, but if that doesnt work, you may have to replace the blower motor. They are available aftermarket, and arent usually too expensive.
Blower/Heater Switch Operation:
This electrical switch, located in a fuse or breaker protected circuit, controls the rpm of the blower motor through a series of control relays and a rheostat. Sometimes the A/C compressor clutch is energized by this switch.
Ive ran across this many times its usually the blower motor but I found that if I replace the blower and the replacement plug(thru GM)that the vehicles never had a blower issue again,so order up a motor and plug and be sure to solder the new plug dont use crimp fittings.have a good day DB