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  #16  
Old 04-30-2004, 01:03 AM
nhodges's Avatar
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Replace the radiator resivoir cap!

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1994 S350
1987 300 SDL (for sale)
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  #17  
Old 04-30-2004, 11:38 PM
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Drove the car today. It went to 115 degrees till I got air cond. shut off, both aux fans running, and heater turned on. That dropped temp back to 95, got car back to house and put away.

I ordered a Behr radiator when I got home. Be in next week, will see what that does for me.

Don
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1991 350SD 265,000 miles
1981 300D 320,000 miles

1990 350SDL 144,000 miles (wrecked)
1991 350SD 225,000 miles (sold)
1985 300D 113,000 (sold)
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1984 300D 360,000 (sold)
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  #18  
Old 04-30-2004, 11:41 PM
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Yeah, that's too hot. There is something wrong somewhere.
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  #19  
Old 04-30-2004, 11:50 PM
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Quote:
Originally posted by DonBaker
Drove the car today. It went to 115 degrees till I got air cond. shut off, both aux fans running, and heater turned on. That dropped temp back to 95, got car back to house and put away.

I ordered a Behr radiator when I got home. Be in next week, will see what that does for me.

Don
Ouch. Yeah, good thing you caught that. You might want to consider a citiric acid flush before replacing the radiator, or at least doing a Prestone-type flush, just to get any buildup out. The new radiator should help a lot. I'd want to check the fan clutch as well, though!! Take a peek at these two Mercedes documents:

http://www.w124performance.com/docs/mb/OM60X/OM603_high_temps.pdf

http://www.w124performance.com/docs/mb/OM60X/citric_acid_flush.pdf

EDIT: Updated link to PDF files.

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Last edited by gsxr; 08-21-2006 at 02:52 PM.
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  #20  
Old 08-21-2006, 02:22 AM
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Question Identical issue - same temps, etc!!! How did it work out, Don???

I'll bring this thread back to life...

I'm having the same issues with temps in my '91 350SD. It USUALLY stays pretty reasonable - around 100C or less, particularly on the freeway - but in stop-&-go traffic I have seen the gauge up to 115C. I just had my radiator flushed and refilled (they used the green stuff after I specifically asked for Zerex G-05!! DAMN!!) but it still went up.

I have been advised that anything over 110C is too hot for the aluminum head, so I will have it checked with my mech this week. Anybody else have advice? I know the manual says anything below 120C and below the red line is acceptable, but I would rather be safe than sorry!

Don - how did this work out for you??? Did you replace your radiator? Did it make a significant difference?

Thanks!
Rusty
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  #21  
Old 08-21-2006, 06:07 AM
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1985 300sd
 
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Quote:
Originally Posted by Blevinsax View Post
I'll bring this thread back to life...

I'm having the same issues with temps in my '91 350SD. It USUALLY stays pretty reasonable - around 100C or less, particularly on the freeway - but in stop-&-go traffic I have seen the gauge up to 115C. I just had my radiator flushed and refilled (they used the green stuff after I specifically asked for Zerex G-05!! DAMN!!) but it still went up.

I have been advised that anything over 110C is too hot for the aluminum head, so I will have it checked with my mech this week. Anybody else have advice? I know the manual says anything below 120C and below the red line is acceptable, but I would rather be safe than sorry!

Don - how did this work out for you??? Did you replace your radiator? Did it make a significant difference?

Thanks!
Rusty
Rusty,Fan Clutch,water pump and thermostat is cheap insurance.I would start there with the climate your in.Johnny
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  #22  
Old 08-21-2006, 08:19 AM
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I just recently purchased a 1991 350 SDL and was anticipating overheating problems because of previously owning a 350 SD, I got the SD squared away with new everything. Because of the SDL approaching the 120 mark in town traffic I first addressed the AC aux fans now I have just replaced beginning with the heat sending unit first, thermostat second and finally, radiator, water pump, fan clutch, new G-05 coolant. Took it for a test run in 100 degree temp yesterday and she never got to 100 degrees. The problem I did have was the expansion tank light showing low, the coolant is actually fluctuating in the tank, it goes down with on road driving and comes up when driving slower speeds or when parked. I have researched the forum and read about this problem and are assuming that there must be a void in the system that hasn't gotten the air out. There were several methods discussed for dealing with this, I would appreciate anyones advice on how to stabalize my system so the expansion light won't keep coming on.
Thanks in advance,
Frank
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  #23  
Old 08-21-2006, 08:42 AM
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1985 300sd
 
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Location: Eads TN
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Quote:
Originally Posted by newptken View Post
I just recently purchased a 1991 350 SDL and was anticipating overheating problems because of previously owning a 350 SD, I got the SD squared away with new everything. Because of the SDL approaching the 120 mark in town traffic I first addressed the AC aux fans now I have just replaced beginning with the heat sending unit first, thermostat second and finally, radiator, water pump, fan clutch, new G-05 coolant. Took it for a test run in 100 degree temp yesterday and she never got to 100 degrees. The problem I did have was the expansion tank light showing low, the coolant is actually fluctuating in the tank, it goes down with on road driving and comes up when driving slower speeds or when parked. I have researched the forum and read about this problem and are assuming that there must be a void in the system that hasn't gotten the air out. There were several methods discussed for dealing with this, I would appreciate anyones advice on how to stabalize my system so the expansion light won't keep coming on.
Thanks in advance,
Frank
I think I have read to remove the upper radiator hose and back fill with coolant then connect it back up to the radiator,maybe Brian can confirm this or correct me,Good luck.
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  #24  
Old 08-21-2006, 09:01 AM
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Quote:
Originally Posted by jrgslg View Post
I think I have read to remove the upper radiator hose and back fill with coolant then connect it back up to the radiator,maybe Brian can confirm this or correct me,Good luck.
Last night, I drove her on ramps and let sit overnight, this AM I disconnected the small hose(the one that goes into top of radiator) at the expansion tank and proceeded to add approx 1/3 gal into this hose, I thought I was really getting somewhere when I noticed that the expansion tank had gained approx the same amount that I had added, so I must assume that I would have accomplished the same thing by just pouring into the expansion tank.
I have yet to test to see if what I did has any benefit.
Thanks for the advice,
Frank
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  #25  
Old 08-21-2006, 02:58 PM
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Here's updated link to the factory service info on high engine temps (>110°C) and also the acid flush info:


http://www.w124performance.com/docs/mb/OM60X/OM603_high_temps.pdf

http://www.w124performance.com/docs/mb/OM60X/citric_acid_flush.pdf

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  #26  
Old 08-21-2006, 03:16 PM
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Quote:
Originally Posted by jrgslg View Post
I think I have read to remove the upper radiator hose and back fill with coolant then connect it back up to the radiator,maybe Brian can confirm this or correct me,Good luck.
Yep, that's the first thing to do. Better to do it the following morning when the engine is cold.

After that, it takes several days of cold starts to get most of the air to the expansion tank. Just fill it to the mark each morining. After several days, it should remain at the mark.

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