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  #1  
Old 06-12-2007, 03:07 PM
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98 E 300 over heating

Took the car out for a test drive which included 3 runs at full throttle acceleration. After returning to more normal driving speed (about 40 MPH), the temperature gauge slowly rose to 120. For as long as I have had the car (4 years and 150,00 miles) the temp never went above 85, even in the summer with the a/c running.

I changed the thermostat and changed the coolant,but the problem is still there. I'm wondering if the water pump impeller might have failed during the high RPMs (approx 4,500 for 1 or 2 seconds)

Anyone have a similar experience?

Nick

1998 E300
w210 025
150k miles

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  #2  
Old 06-12-2007, 03:14 PM
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High temps, but not quite 120 when my fan clutch wasn't working. When the engine is hot, open the hood and then watch the fan as you shut off the engine. If it keeps spinning, the clutch is bad.
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  #3  
Old 06-12-2007, 03:24 PM
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Location: Walnut Creek, CA & 1,150 miles S of Key West
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Additionally, you can test teh Aux fans to see that they are working. They should have come on long before you hit 120c along with the fan clutch.

Key to pos #2, hold both "auto" CCU buttons for 10 seconds. Fans should run at max speed.
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  #4  
Old 06-12-2007, 04:56 PM
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This past weekend I had the pleasure of sitting in 97 degrees heat in bumper to bumper traffic in NJ after running highway speeds for several hours. With the A/C on the gauge never even came close to the mark between the 80 and 120 lines, I'd guess it was 2/3rd of the way to that mark (is that mark supposed to be 100C???).

In any event, as soon as it got to that point you could hear the roar/whine of the fan any time the engine revved and the temps came right back down to about 80C. You can really hear that fan roar when it engages. There is no reason your car should ever come close to 120C, something is wrong with it and you need to find out what it is.

First, make sure your aux fan works. Mine didn't when I bought mine. I had to replace the motor-side of it. That failure alone won't cause overheating I don't think, but it, combined with a bad fan clutch would.

Speaking of fan clutches, the thing about them is that they will only work if the radiator is doing its job and shedding heat. Depending on how well your cooling system has been maintained you may have a plugged radiator.

Finally, your sense of the water pump being to blame may be correct but it is hard to diagnose without eliminating everything else. If the pump is original then, yes, they have been known to fail this way.

But whatever it is, find it and fix it and don't drive the car while it is spiking that high...these engines are virtually bullet-proof, but excessive overheating is the one bullet that can penetrate its armor.
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Last edited by nhdoc; 06-12-2007 at 05:03 PM.
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  #5  
Old 06-12-2007, 07:01 PM
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The aux fans are both turning. I replaced the thin belt that drives the passenger side aux fan last year. The fan clutch seems to functioning also.

I am also getting a "display error" message on the dash, along with a radiator symbol. I don't know if that is related to the problem or it's a result of having just changed the coolant. The coolant that I drained looked very much like the new 50/50 solution that replaced it i.e. light amber in color and no dirt,rust, sediment or any other visible contaminants. The thermostat looked good and it did open at approx. 80 c when I tested it in hot water.

The other clue, or symptom, is that the temperature gauge does not increase steadily once it passes rise above 80. Between 80 and 100, it jumps up and down a few degrees, hesitates , but slowly keeps rising.

I looked in WIS and can't find where the engine temp sensor is. Can someone point me in the right direction?

I have no intention on driving it until this is fixed.

Nick

1998 E300
W210 025
150k miles
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  #6  
Old 06-12-2007, 07:15 PM
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Did you "burp it" after refilling the coolant?

Your 98 may ahve a bolt where the upper hose connects to the block todo this. Most 99's dont.
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09' Hyundai Santa Fe Diesel 48k (S.A.)
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  #7  
Old 06-12-2007, 07:30 PM
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E300 DT overheating after episode of high revs

Hopefully you don't have the same problem this guy had.
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  #8  
Old 06-12-2007, 08:32 PM
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Quote:
Originally Posted by nhdoc View Post
E300 DT overheating after episode of high revs

Hopefully you don't have the same problem this guy had.
Yeah, I really hope I don't have the same problem. I' keeping my fingers crossed that a couple of seconds of hard acceleration and high revs on the highway wouldn't cause the same stresses as 45 minutes of revving to try and get unstuck in the snow.

Nick

1998 E300
W210 025
150k miles
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  #9  
Old 06-12-2007, 09:49 PM
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If hitting the kickdown switch and pulling max rpm through a few gears caused them damage mine would have died a violent death long ago......45 min rocking back and forth not moving is very different.
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N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Last edited by TMAllison; 06-12-2007 at 09:55 PM.
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  #10  
Old 06-12-2007, 09:52 PM
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I'd say only if the first 149,999 miles were driven like a little old lady would revving it to redline cause a blowout of a head gasket. If you'd been driving it normally all along then it is probably more mundane but still should be attended to sooner rather than later.
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2013 Lincoln MKz
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  #11  
Old 06-19-2007, 02:18 PM
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Update

I took the car to a local Mercedes mechanic (he worked for a Mercedes dealership for over 10 prior to starting out on his own). He thinks excessive pressure from a blown head gasket is preventing the T-stat from opening. I asked him to try and run the car without the T-stat in order to definitely rule out the coolant pump.

Can anyone shed some light on the degree of difficultly involved with pulling the head and replacing the gasket? It is better left to pros? Can/should the head be taken off without removing the injectors?

Thanks,

Nick

1998 E300
w210 025
150k miles
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  #12  
Old 06-25-2007, 05:26 PM
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The problem causing the over heating was a broken (plastic parts) water pump.

Thanks to all for your help resolving this issue.
Nick

1998 E300
w210 025
150k miles
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  #13  
Old 06-25-2007, 05:37 PM
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Location: Belfast N. Ireland
Posts: 95
Plastic Impellor

Hi

Mine failed too on the A10 Paris ring road impellor broke up it is a common fault.
99 E300td water pump replacement

Glad you got it fixed.

For anyone else once you have the thermostat out you can put your finger in at the back of the water pump and turn the pulley and if the impellor doesnt turn then its broken.

230K

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