still tryin to figure out my overheating problems...but this just gave me some ideas..

since the cooling system works effeciently off of the huge radiator and relies on pressure from the coolant. i was wondering about my heater servo unit.....
The car used to be pegged a lot around the 120C marker which is extremely detrimental to engine life. I had a new water pump and housing replaced and RnR the radiator and superflushed the system well. temperatures obviously dropped quite a bit but not for that long..

before i did most of the work on this car, my heater servo unit was leaking a little bit but not that much; only at high temperatures say around 110C....theres little evidence of antifreeze around the base unit of the servo unit.

since this is leaking a little bit...should i buy a tube of radiator seal to seal it up for a quick fix...or replace the whole darn thing for 300.00 +75.00 core charge? Most importantly, will this solve my overheating problems on my car, due to the possible loss of pressure? I am currently running 100C everytime i start up and on some hill climbs...it'll go up to about 115C if i drive it really hard.

thanks for everyones input
allen

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1986 300E 200K + 2 years broken odometer
1978 300D 280K + 2 years broken odometer

just bringing this back up to the forums...

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1986 300E 200K + 2 years broken odometer
1978 300D 280K + 2 years broken odometer

Anything over 100*C is bad for the motor's longevity, I suggest you just get a "new" radiator. I think stop leak is more of a problem than a solution, just think where the rest of it goes once the leak is stopped. It will end up clogging up your new radiator as well. If you absolutely refuse to buy a new radiator you can have it taken to a radiator shop and have the leaky spot soldered.

Increasing the pressure only serves one point, to raise the boiling point. If the coolant begins boiling cavitation begins inside the head.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k

I believe that if the servo gives up, it can cause overheating.

80% sure.

The problem is inside and not so much the leak on the outside.
60% sure.

that is my 2 cents.

My servo was bad for a long time and I do not recall overheating, however I may have been lucky.
I had it replaced anyway. 2 years ago.

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD