DOES THE 1993 model s350 or 300sd have the same type of trouble with there evaporator as my 1995 S420 has. I am looking at a 1993 Diesel and was just wondering if the early model has the same problem. My wife would not be happy if I traded one problem for another. Thank you
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1982 300td wagon with 424,000 miles running strong
1983 300 coupe with 279,000 not running.
1984 300sd with 200,00 running well
1995 S420 with 156,000 running well but sitting until OPEC gives me a break.
1993 Ford crewcab with new 7.3 international with 190,000 miles.
In sunny south FL. Mostly with wvo on the diesels.
DOES THE 1993 model s350 or 300sd have the same type of trouble with there evaporator as my 1995 S420 has. I am looking at a 1993 Diesel and was just wondering if the early model has the same problem. My wife would not be happy if I traded one problem for another. Thank you
Yes. There are those that say the problem was never really fixed through the entire W140 model run.
The W140 had evaporator problems from the first day of production up the last. The only way to correct the problem is to install an aftermarket FULL cooper evap.
But going back to your original question: an evaporator on a early diesel W140 would be the LEAST of your problems. The diesel engine on these models is well documented as the worst engine ever produced by M.B. It will literally self-destruct itself and all repairs and subsecuent recalls never really fixed the problem.
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A. R. R.
S 500 L, 1998
E 320 T, 1995
I had a new evaporator fitted to my W140 about 5 years ago. I remember seeing that the old unit had corroded and then realised that it was constructed from aluminium and copper in intimate contact (at this distance I can't remember whether it was copper tubing and aluminium manifolds or the other way round). I was appalled - any professional engineer knows that this combination of metals is to be avoided as far as possible, especially where they can be in mutual contact with water (e.g. in an evaporator!). Aluminium-to-copper has a potential difference of about 1.6 volts in the electrochemical series and works like a small battery, consuming the aluminium. I don't know what precautions the manufacturer of these evaporators took - if any - but whatever they were, they didn't work. I wrote and complained to Mercedes-Benz but simply received the brush off.
Vehicle: 500 SEL (W140- the King of the Road!) SL500 (My new baby!)
Location: Lexington, Kentucky
Posts: 710
some of the diesels evidently are okay. My neighbour has a W140 300SD with 175,000 miles on it and claims to have never had a problem other than the evaporator
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1993 500 SEL (W140-the King of the road!)
1992 500SL (My New Baby!)
You know you're German if:
You went to school in a Gymnasium
You check your shoes for candy on December 6
You have real candles on your Christmas tree
You know a Frankfurter is a person not a hotdog
Schnitzel with noodles is your favorite meal, not a song in a cheesy musical!
You drive the Autobahn in a Mercedes-Benz at the speed of sound!
some of the diesels evidently are okay. My neighbour has a W140 300SD with 175,000 miles on it and claims to have never had a problem other than the evaporator
the 350 is the one that has problems apparantly it's due to the extra displacement and the shrinking of the walls of the head.
Vehicle: Current 1992 - 500SEL, W124 - 1989 230E (sold)
Posts: 1,376
Well, when it comes down to evaporators you can extend the life a bit by regualary servicing the AC system (eg. replacing the dryer to make sure there is no moisture in the system) also if the AC is inoperable due to some secondary fault and the gas/moisture just sits without moving that causes most of the corossion....
Well, when it comes down to evaporators you can extend the life a bit by regualary servicing the AC system (eg. replacing the dryer to make sure there is no moisture in the system) also if the AC is inoperable due to some secondary fault and the gas/moisture just sits without moving that causes most of the corossion....
The corrosion I am referring to was on the outside surface of the evaporator where the water vapour from the external air condenses. The only way to stop this is by not using the aircon - and even then it can get damp.
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