Blower motor not working, help!

[otis24]

1991 Chev K1500. I replaced the digital control unit about 6 months ago with a refurbised unit. The digital selector lets me choose "hi, med, low". The blower just doesent blow air. If the resistor was bad, wouldnt it blow on just "hi"? Fuse was good and I didnt find any relays. Is it probably the blower motor? Anything else I should check?

 

[The_Jeff]

Can you get down there and rig up a 12 volt bulb in the connection? A tail light bulb will pull a decent amount of current to test and will show decent gradients in brightness to go with the resistors for speed.

 

[NHGUY]

GMs have always ate blower motors.They frequently squeak too.I think its a bum motor.

 

[andyd]

Generic old school resistor pack is 2 wire resistors arrayed to give 4 spds with straight 12vdc. Turn the blower to high and rap the housing with a stick to free a stuck brush. The motor is all gunked up with inhaled debris and is running dry on lube as well. Some you can rescue with some TLC. Most are cheaply replaced. The Grand Wag's blower was hand assembled, so all you did was take it apart,clean, oil it and reassemble. All the time a replacement can purchased for 35$ anywhere. BTW, any time I had the lower speeds fail, it was never the switch, it was a sticky motor. By cheap, that is just the part. R+Ring them sometime is very difficult.

 

[zzyzzx]

Remove the blower motor and bench test it. Or run 12V to it from the battery. Test for voltage at the blower motor first.

 

[Bud_One]

Give it a good whack and see if it comes on.
My mother in laws old 2002 Cadillac Deville's blower motor would not work at times and would come on if you slammed the glove box door hard enough. Blower motor needed replacing.

 

[Merkava_4]

Those are usually just a 2-spade 2-wire connector. Turn the key on and see if to got power to the feed wire. Put 12V to the ground wire and see if your ground is good. If you got power and ground to the connector, bypass the connector and put a jumper wire from the ground spade to a good ground and apply 12V directly to the feed spade. If the motor runs, you know you either got a problem with the blower relay or the blower fan switch.

 

[Mackelroy]

If the ground coming off the resistor is corroded fan wont work at all .

 

[crazyoildude]

unplug the blower motor and power it up with 12 volts if the motor turns on its a good motor. check the fuse with a tester also. Sometimes a connection gets hot and distorts you can usually find that pretty easy. Also check the grounds. Of course you should check everything with the cars battery power unless you disconnect the power wire from the motor.

 

[otis24]

The blower motor started working again. I think perhaps it has some bad brushes in the motor. Didn't want to take a chance of getting stranded with no defroster. Replaced the motor anyway. Or, at least, the Ford garage did. Only 1.1 hrs of labor. Really puts out the air now.