My little motor in the heater hose probably needs new brushes. I'm getting very little heat from my 95 X300 4.0. .I looked through the archives & found all the motors look to be bigger than mine.On mine the round top part is 1 1/2 " in diameter by 1 1/2" high, Just wondering, is there more than one type/size of these motors & if mine can be rebuild mine?

 

Bosch motor units where peoduction replacments later on the X308 at year X .

The bru for the original 3are 3A keeping in mind there is a flow control valve

 

I was looking @ the wrong thing, Don't know what that other little cyl thing does though. I see the motor below, it looks the same as the ones in The Archives repair pic's. Thanks guys.

 

The other smaller cylinder is the heater valve. It opens to allow heated coolant into the matrix while the pump pumps it through. The valve can open and close automatically to maintain a certain flow through the matrix if your Climate Control is set to Auto. Of course it operates "manually" by changing the temperature setting while not in Auto mode. Neat.

 

iN HOSPITALAL YTRYING

 

I was wondering what that did after I found the motor I was looking for, thanks for that info, yes interesting. So, how reliable is this heater valve ? Seems like we should make brushes part of the 100k maintenance program in the other motor. I see a lot about this motor failing on The Forums.
In "olden days" the heater hose went into the matrix from the block & back to the block without any fanfare "stuff" & the cabin got hot, high tech?????
PS. LP Hospital ??

 

 

 

In hospitalt develope understanding slowly

 

Yes . Feeld modules and nton / off Solinoiwater flow difection by heat value in the hose .

Sensor in cbin getts dirtu

hit mptor for spin upp[.

 

A33 bushing x 2 if needed

Look for control fuses .

 

Thanks LP for your info on where to find these "33A " brushes for the heater hose motor. Perfect fit, $20.
44Lawrence

 

Someone else passed it along as mine had a folded over and pinched off hose back behind there