Hi everyone.
This is on a 1980 300TD (naturally asperated).

Yesterday while driving in town my temperature started rising fast. I pulled over and coolant was spewing out from some seal under the part in the picture (the detail shot shows the leak pretty well).

What is it this part called? I assume it has to do with climate control. I had turned on the "bi-level" blower (which I rarely, if ever, do) shortly before I saw my temp starting to rise.

Also, please feel free to share advice on how to fix it because I don't know that either . Is there a gasket that I can replace? or do I need to replace the whole part?

Or I was hoping that maybe if I filled the coolant back up and turned the blower off, then coolant would stop flowing through this part and thus stop shooting out all over the place. Or maybe that's wishful thinking...

Thanks!
Christine

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1980 300TD

evil servo

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daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more

Agreed!

That is the climate control system for the car, very troublesome, and very expensive....

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Yup. I finally found a post with pictures that told me it was the evil servo. It also had a great tutorial on bypassing it altogether and a diagram that helped a lot.

In the meantime, was I correct in thinking that if I turn the heat off my leak will go away? A temporary solution but it would be really convenient.

Other thoughts on how to get back on the road as soon asn easily as I can?
thanks again.

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1980 300TD

Thanks

The leak is coming from the box itself. It looks like there is a top part and a smaller squarish bottom part and the leak is where they meet It's not from any of the hoses.

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1980 300TD

Appears to be part #143, circulation pump valve, #149 is a repair kit.
Or an A/C servo, neither of which I can find at my usual parts place.
However the listed A/C servo at Performance Products is priced at $2013, YIKES!
Good luck, the dealer may be the place to see about that repair kit.

Attached Thumbnails

     

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83 SD

84 CD

go to napa auto parts and tell them you want a manual heater valve the kind that is put between heater hoses, should come witha a maual cable that will open and shut your heater valve to allow heat to come into the car from a manual cable. then just bypass servo for the winter, there is and after market kit made to do away with servo , it does cost around 650.00 dollars and is made by Innovative Electronics
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UnwiredTools™ ACCII Upgrade Kit. Other then that depends on how much money you want to spend, if the car is just a beater and you don't want to put that kind of money into it then go the manual heater valve route, it will just give you heat , you will still have no Air conditioning, good luck

Thanks pop & blow! I'll do that this weekend.
AC doesn't work anyway.

I've read a few post with detailed instructions on bypassing the servo and it looks easy enough.

...Every so often I have a traumatic event with this car and I think "Grrrr! I'm sending her to the junk yard this time!" But it always turns out that there is a fairly simple fix and she's back on the road again

Thanks everyone

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1980 300TD

I have a spare one. Condition, not sure because I removed it and stored it two years ago. Will check it out if you are interested.

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1987 300SDL 314K mi, counting; #22 Head
1999 E300Turbo 405K original miles
1997 E320 180K mi (Son's)
2002 ML320 (Son's)
1998 S320 140K mi (Son's) sold
1985 300SD 311K mi
1984 300D 324K mi (killed by a hit-n-run turd)
*************************************

Same here, I have a good one that was installed in a car for a year then replaced along with the entire rest of the system. also a short pipe and a heater valve from a 190 works great in its place.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

So just to update... I bypassed the servo today and no leaks and no overheating.Yay!

Added Bonus #1: The heat has never ever blown like this! It's such a luxury!
Added Bonus #2: It eliminated my vacuum problem-- the car now shuts off even if I have the blower on.

It was a little tricky getting the new hoses and the valve to fit around the servo without twisting and kinking but eventually I got it worked out. Otherwise, the hardest part of this project was getting the valve. Advanced Auto and another big autoparts store are in walking distance to me, but none of the counter people could find the part unless I gave them the year, make and model of the car it was originally designed for. Ended up getting a ride out to Napa for it.

Thanks for the help everyone. So glad to be back on the road again.

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1980 300TD

They don't call it Dr. Evil Servo for nuthin'.........



BTW, nice looking wagon. I loved my '80 300TD. It was a very rare Climate Contol III, obviously a late production 1980.
Take somebody up on their working used Evil Servo. It is still nice to have a working system.

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

Recently a local MB dealer parts guy told me MB actually has a $500-kit to do away the the evil servo as well. He also said they don't push it much as it is an admission of MB's big mistake.

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