Blower motor replace
 

94 s320.
Blower motor is shot, armature and brushes worn out. My question is this. Can I just change the motor itself or do I have to buy the assembly as per Mercedes repair/replace unit cost +$700. Online Replacement Bosch motor $134. I have the squirrel cage off my motor with no damage. I presume I should be able to simply replace it to the new motor, or is there a possiblity once removed it will not fit securely on new motor shaft. Anyone have any experience in this type of retrofit.

What does the shaft hole in the squirrel cage look like? If it's completely round, you might have a problem. If it isn't (like having a flat side), then it should be no problem.

Believe it or not, fans are fans. I pulled this one out of one of our VAV boxes in my building last week. Same principal, only a little bigger (about 18" in diameter). A new $78 motor and she'll be good as new, cranking out about 1700 CFM.

http://img256.imageshack.us/img256/3028/badparts.jpg

Honestly, though, even if it is a completely round hole, roughening up the shaft and applying a little gorilla glue will more than likely do the trick...

If you got the squirrel cage off you are well on the way, since most of them are stuck pretty good. I think they sell the motor right here on peach parts I would also get a regulator, and a new filter. The system operates with the regulator in the ground side of the motor, and posetive is directly applied. I think there is a flat on the shaft, I dont have a clue what the previous post is all about.
If you did not remove the regulator, you might try it, otherwise you need a little thermal paste because it uses the frame as a heat sink. I had not checked on the price of the regulator lately and they seem to have gone up.
Here are some more facts
http://www.peachparts.com/Wikka/W140BlowerMotor

Yes you have to cut the housing to remove the blower motor. Your local parts house should have some tar like sealer that you can use reseal it when you are done. We are not quite sure what you mean by the chipping of the plastic housing but it does not sound normal to us.

Thanks Peter.
It wasn't that hard to remove the fan, just well supported the fan on a solid base and 2 firm hits on the shaft end with a hammer and punch to loosen it, then it tapped out easily.
There is no flat on the shaft. It is round with a knurl/spline cut on the end.
After having a closer look at the pcs I' m going to go ahead and get a motor, assemble my fan and test it out. If fan shows signs of being loose I'll apply some glue.
Sad they don't sell new motors with fan. Can't find anyone who even sells fan alone.
New regulater just incase the present K.A.E. year old is malfunctioning.
Motor & regulator will be $292. compared to $861. for assembly.

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