<circulation problem.>>

What do you think 70/30% ratio does to "circulation"??

You didn't answer any my questions . . . on this forum, we use "numbers" not just rhetoric.

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Regards . . . . JimF
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'94 S500 Cpe

Visit my Mercedes Web Page

I have no idea what you are talking about. What "rhetoric"?

The car has had various combinations of coolant/H2o including straight water at the moment, for testing and constant opening/closing/draining. An engine will run coolest with straight H2o. You know this, right?

My preferred mix is approx. 30% MB factory coolant to 70% distilled H2o normally. I am in SoCal and do not need the freeze protection. In MN., where I am from originally, it is obviously different.

I must chime in here, JimF is correct I had a similar problem with my 96S500, I followed Jimf tread on installing a resistor over the fan temp switch, sure this made the fans kick in earlier but I still had a engine running to hot for my liking. I had the fan clutch replaced with Jim's mod to it, still ran hot in traffic and town, like about 105 degrees celsuis .

Then I changed to a 50/50 coolant water mixture and replaced the rad cap with a OEM cap from the dealer. What a diffrence car now runs at 90 degrees in traffic and electric fans does not even get triggered by the tempreture switch.

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1996 s500
1978 450 slc
1999 C240

I wonder if the heads aren't now compromised in some way, that is if it overheated. Did they skim the heads?

The only real way you're going to know for sure is to pull them and see for yourself. You're always going to wonder otherwise, what with such a job having been done by a 'shop of ill repute'. But jeez what a job. Expensive even if you do it yourself.

That's what's commonly known as a 'conundrum'. Can't just live with it. Can't just pull the heads again to find out what's wrong. You've checked everything else.

70k miles sounds like a sweet car. I love those w140s. Post a photo. Hope you figure this out.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)