Mercedes part number: 0008350157

old unit began smoking.

tried to replace with remanufactured unit. that began smoking = pulled it off immediately.

what's going wrong?

Your auxiliary water pump is froze......heard more then one story about it being froze and taking out the amplifier....also do you have an updated servo? There's a chance the servo is bad too...

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probably the servo stuck; i think you can wire in a 1 amp fuse somewhere to prevent it from blowing the amp. try W116.org

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1983 300SD (daily driver)
1991 420SEL (work in progress)
1979 300SD (future replacement for 83 SD)

RIP:
1983 300SD (totalled)
1986 420SEL

hmmm ...

replacement servo (3 years old) from George Murphy at Performance Analysis. He said possibly something broke in his servo = he's happy to test and see what/if anything wrong.

any other ideas?

how would aux water pump freezing (how does that happen) ... take out the heating amp?

i do have an updated replacement servo (3 years old) from George Murphy at Performance Analysis.

He said possibly something broke in his servo = he's happy to test and see what/if anything wrong.

any other ideas?

Its probably the aux water pump....if the amp smoked its probably dead now.....when you get a new amp....unplug the aux water pump....if it is bad...no smoking amp.....what I did was to pull mine and test it on the battery....it was froze so I unscrewed it.....cleaned it up, lubed the bearings and no issue since.....the aux water is wired to the amp if I remember correctly....read up about your servo system here....

1971 Chrysler Imperial Auto-Temp 2 Service Reference Guide - Session 281

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