Air Conditioning Fan Failure

[Tom]

The A/C fan in my 94 SL2 has an intermittant failure that I'd like to repair
mysel if possible. The fan will come on and then after 2-5 minutes the fan
speed drops until the fan eventually stops all together. I believe that the
fan switch is OK because I have pulled the connector off the back and jumped
one of the fan wires and had the same results. I guess that this leaves the
fan itself, or the multi-speed fan control electronics.

Anyone have experience with this type of repair? I hate to take it to the
dealer when the cost would be a high percentage of the total value of the 10
year old car.

 

[Kirk Kohnen]

If I had to guess, I'd guess that the motor is worn out.

The brushes in the motor wear out. When they're at their end, they make
intermittent contact with the commutator which will make the motor run
intermittently and slowly.

 

[Oppie]

Check the fan if it spins freely (bad bearing)
Possible worn out brushes inside the fan. (SOL on this since brushes are not
easily exchangeable)

See if you can power the fan directly from battery without the variable
speed module just to verify that the fan motor is working properly. If it
does then check out the module and related temperature sensor.

Oppie

 

[jmb6420]

My 93 had the same problem. Bought a new fan for $30.00 from auto parts
store. Three screws and 10 minutes later all was well.

 

[jmb6420]

My 93 had the same problem. Bought a new fan for $30.00 from auto parts
store. Three screws and 10 minutes later all was well.