My 1985 500sel euro has a brand new raditor water 1 old year water pump and a removed thermastat. new antifreeze ive done every thing. even on the interstate if i am behind a pickup and it starts go get up to 110 and u pull out in to air and it wont cool down for a while and then goes to about 105 c (with the a/c of it cools down) its got the big v8 is this normal

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1985 euro 500sel 220k
1981 300sd 278k sold
1989 chrysler
leabaron 130k
1990 320sl (hopefully)

Put a new thermostat in your car. Mercedes will not cool properly without a thermostat. Your car should run at about 100C.

ive tried it


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1985 euro 500sel 220k
1981 300sd 278k sold
1989 chrysler
leabaron 130k
1990 320sl (hopefully)

Maybe your fanclutch is not working properly.
Check other posts for info on how to check fanclutch.
-Larry

aright thanks



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1985 euro 500sel 220k
1981 300sd 278k sold
1989 chrysler
leabaron 130k
1990 320sl (hopefully)

is this the fan in front of the raditor if so mine works fin i just replaced the sencor twice

Nope, its the one driven by the engine, with a belt. (Between the radiator and the motor)

it spins fin but could it not be spining fast enough

When you try to spin it, it should not spin loosely at all. It should feel like it barely wants to be spun...maybe a couple of inches, when you really try to spin it.

I doubt that it's the fan clutch, because (if I've read the message correctly) the problem is that it gets hot while he's driving pretty fast (he wrote, "...even on the interstate..."). The fan is only useful during idle and low driving speeds -- at fast road speeds, air flow through the radiator should be adequate regardless of the condition of his fan clutch.
The problem probably lies elsewhere.

any ideas as to why and if i get it up to 90 95 it cools downs quick

I have heard that non MB rebuilt waterpumps do not have the close tolerances that MB rebuilt pumps have. Could your pump be non MB rebuilt? (that only when youre going 90 the engine revs fast enough to pump the water fast enough?) Once the engine is warm, do the hoses appear to be pressurized at least a little? And, with the engine off, are there any cool spots on the radiator when it obviously shoud be hot?
Check these things and post to your hearts content.
-Larry

Check your ignition timing. You are using premium aren't you??

93 octan


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1985 euro 500sel 220k
1981 300sd 278k sold
1989 chrysler
leabaron 130k
1990 320sl (hopefully)

There is something amiss with your water circulation, either the radiator is partially obstructed, or you have air in the cooling system and it needs to be "burped".

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Jeff Lawrence
1987 300e
1989 300e
1987 BMW 325