blower motor testing 1982 300SD

[dmtinker]

Is there a way to test a blower motor? I replaced the ACC and it worked for 2 days. I heard a chirp then nothing. I suspect the motor is frozen but I don't know how to test it.

Could it be another bad ACC? Could it be a relay? There are no bad fuses.

[Brian Carlton]

Drop the passenger kick panel and you'll see the plug for the blower motor. Disconnect the plug, apply 12V and ground and see if the motor runs.....

If not, then you'll need to pull the motor.

If the motor is OK, then you've got a problem with either the controller, the temp switch, the resistors, or the CCU itself. It's more difficult to track these down.

[dmtinker]

Does it matter how many amps I apply? i.e. should I use a car battery or can I use something smaller?

[Brian Carlton]

Originally Posted by dmtinker

Does it matter how many amps I apply? i.e. should I use a car battery or can I use something smaller?

You provide the voltage. The device determines the amperage based upon it's resistance.

You can connect it up to the power station..........if they had 12V DC.......

[sixto]

With a motor that works intermittently, check how much axial play there is in the shaft. Usually you remove the motor, lay it on its side and it works. You put in in the car and it doesn't. That suggets worn bearings messing with brush alignment.

Sixto
93 300SD

[RAYMOND485]

1984 300d Turbo 141,000
Pull Power Plug And Check For 12 Volts, If 12 Volts, Replace MoTOR
Or Take It To Auto Electical Shop, Need New Brushes .