I've always thought this was an aux pump. It sure looks like one, but someone said that my model might not have had one and that this might be a mono valve that controls flow to the heater core. I'm talking about the thing on the left in the photo, not the servo.

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1980 300D, 128K

Iam not familiar with your year and the servo, but it does look like a aux pump. do those two hoses attach to the bottom of the unit? the top looks like the electric motor on my pump that sits horizonal on the inner fender.

Is there 12 volts that goes to it, ie a plug? the brown wire is ground don`t remember the other wire color maybe blk with a red stripe. run 12v to the plug and see if it will activate the motor.

Don`t know if turning on the key and pushing the heat button will do it or not. try this first.



Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

yes, that's the aux pump. The monovalve came into use later ('81) as part of the upgraded system to replace the evilservo.

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H.D.B.
OBK #45
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'75 W115 240D, wife's dd, 197K
........'75 W115 300D, my dd, 245K
.. .. ..........'82 W126 300SD, the 'someday' project

Ok, that's what I thought, but just needed some confirmation. Thanks!

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1980 300D, 128K