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#1
05-21-2006, 11:01 PM
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complete servo replacement/ swap?
I have a 1980 300SD with the dreaded (deaded?) servo unit. Is it possible to swap out this A/C unit with something from another chassis or model?
Will only work if it is an easy-to-medium swap. I'm not a mechanic-expert (although the 300SD is working on that). 
__________________
79 300SD - $50 out of pocket purchase 03 Dodge Ram 3500 CTD 2003 VW Jetta TDI 
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#2
05-22-2006, 11:37 AM
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Doubt it is easy to medium.
It has been suggested here that it is only a maybe. The expectation is that the complete evaporator/heat-exchanger box behind dash would have to be swapped out. Then all the electrical for the newer model. Having a donor car handy would be a plus. The $550 to $750 replacement system was on my list as a choice. It seemed, in the long run, to be the best no hassle sure to work a long time solution. I plan on driving my car another 10 years. But... I was able to get my hands on an aluminum bodied servo valve and amplifier for maybe $300 (the aluminum valve is currently $600). It worked and now I am pleased. Part of the installation included repair of broken vaccum line going to the old valve. When my valve originally broke I went several years with just a bypass hose for winter driving so I could get heat. My AC worked even with a busted valve. So, if money is tight, bypass for less than $20 to get heat. If you can acquire a replacement servo (and possibly the amp), it is a no hassle drop in repair. If the price for those parts starts getting up around $500, get the kit and never worry about it again.
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80 300D 340K Owned 30 yrs 83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day 02 Z71 Suburban 117,000 15 Toyota Prius 2600 miles 00 Harley Sportster 24k 09 Yamaha R6 03 Ninja 250
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#3
05-22-2006, 02:08 PM
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Do you have links for those procedures. I have also a W116. and i was exploring the possibility to have one of those 700 bucks electronic servo retrofit or even better... a manual european AC from a 6.9.
How does the bypass work? only for the heat or you can also bypass for the cooling? right now i only have defrost.
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------------------------------------------ Aquilae non capunt muscas! (Eagles don't hunt flies!) 1979 300SD Black/Black MBtex239000mi 1983 300TD euro-NA. White/Olive Cloth-MBtex 201000mi. Fleet car of the USA embassy in Morocco 1983 240D Labrador Blue/Blue MBtex 161000mi
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#4
05-22-2006, 10:54 PM
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I would like links too because my 300sd A/C unit also failed.
The compressor is frozen up and I don't know what else it will need but the mechanic said it would cost $500 to $800 to fix and that he would not recommend doing it. He said just drive it as is. That is OK in winter but in So.Cal. not a good plan in the summer. The body of this car is in excellent condition with no rust and it has 210,000 miles. I think it could easily go another 100,000 miles because it does not use oil or smoke. The A/C system has been worked on before so may need the servo kit too. My mechanic is very honest so I can ask him and he will give an honest answer.
__________________
DCM 1977 240d 1980 300sd 1987 Chevrolet Suburban
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#5
05-22-2006, 11:24 PM
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Bypass kit
Here is a bypass kit from mercedes source. It's in the interactive catalog under electrical / early climate control. I Haven't used it but I think that is the way I'm gonna go.
http://www.**************.com/
__________________
Sonny  86 190D N/A 2.5L Auto 265k "Ruby" -Sold-  79 300D 242k "Condi" my first -sold- RIP 2013 chevy sonic hatchback - had to for work 
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#6
11-27-2006, 10:47 PM
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Rhodes 2010 PM'ed you.
Thanks
__________________
1979 300D 220 K miles 1995 C280 109 K miles 1992 Cadillac Eldorado Touring Coupe 57K miles SOLD ******************** 1979 240D 140Kmiles (bought for parents) *SOLD.SAN FRANCISCO/(*San Diego) 1989 300SE 148 K miles *SOLD
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