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  #1  
Old 04-21-2011, 01:04 AM
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cooling system

Anyone else having cooling system issues after modifying their benz? In the performance section the cooling system doesnt get hit on very often but i seem to have run up against that point that i am creating more heat than my cooling system can dispose off. I have been noticing that while im at wot the temp slowly climbs past 80 (only after the tstat is open and the radiator is warmed up) and when i let off it returns to normal. anyone else experiencing this?

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Old 04-21-2011, 05:39 AM
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The cooling system doesn't really turn on full blast until 100, At that point the tstat fully opens.

The behavior is par for the course for an om603. Of course, at least you actually have a radiator upgrade option (the turbo 300 radiator).
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Old 04-21-2011, 11:11 AM
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What have you done to an N/A 240D that is raising temps?
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Old 04-21-2011, 02:07 PM
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ah but i dont have a 603 i have a 616 and it will climb above 100. uh... nothing... its stock i promise

Seriously though its just something for everyone to think about, but i have a turbo, and a pump that basically has everything done to it you can do (except for cut dv's (happinin today suckas!) and larger injectors)
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1996 s10 zr2 with a 6.5 turbo diesel
1996 c2500 suburban with a 6.5 turbo diesel
1981 300sd with a turbo 617
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Last edited by josha37; 04-21-2011 at 02:34 PM.
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  #5  
Old 04-21-2011, 03:18 PM
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I had the same problem with my 616. I installed an aluminum radiator, replaced the t-stat, flushed the system, and still ran hot at speed.

I tried reduceing the bypass port in the t-stat housing to increase the flow from the radiator, but still to hot for my taste.

I replaced the mechanical fan with an aluminum one with a clutch from a 300D and that helped cooling at idle. Recommend!

I ended up removing the t-stat, plugging the bypass port in the t-stat housing, and making a inline t-stat housing for a small block t-stat and put it in the upper hose. I made a small bypass line from the new t-stat to the vent screw of the stock t-stat housing to circulate water through the inline housing.

Basically I converted the bypass type system to a conventional system that uses a common t-stat. I put a 160 degree stat and all is good.

I can also turn on the auxiliary fan manually if I have to. After the new set up, I only turn it on if I am idling for a long time with the A/C on.
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Old 04-21-2011, 03:47 PM
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yea i have my aux fan on a switch to but for some reason the large mechanical fan is missing... wierd. how you been 616? long time no see!
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1996 c2500 suburban with a 6.5 turbo diesel
1981 300sd with a turbo 617
Monte carlo figure 8 car
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Old 04-21-2011, 05:32 PM
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Quote:
Originally Posted by aaa View Post
The behavior is par for the course for an om603.
Not on any of mine (6 so far).
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Old 04-21-2011, 06:00 PM
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Quote:
Originally Posted by babymog View Post
Not on any of mine (6 so far).
You've driven on the highway up a hill on a hot day and not have it budge past 80?
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Old 04-21-2011, 07:10 PM
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One exception, an '87 300TD test-car running flat-out and full of vibration-analysis equipment. I blew a defective heater hose on it.

For my cars, 85C on all of them on the highway. With the A/C on they seldom get above 85C in town on a hot day (runs slightly warmer idling without the A/C on).

That's how my '91 ran new, if any of them were to do it differently I'd fix the problem.
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Old 04-21-2011, 08:38 PM
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yea... it was fine until recently. i would suspect a problem if it had warmed up like this in stock form but i know what is going on so i try to limit wot times to resonable lengths.

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1996 c2500 suburban with a 6.5 turbo diesel
1981 300sd with a turbo 617
Monte carlo figure 8 car
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