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Old 05-31-2006, 09:45 AM
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possible overheating 1993 400E

Hey All,
I was wondering what the ideal cruising temperature is for a 1993 400E. I only started driving this car in the fall last year, and it stayed relatively mild. The car usually held around 80-85 degrees per the gauge. Now that it is summer and I am using the air condition I am noticing big fluctuations in the temperature. I don't know what the unlabled tab in between 80 and 120 is(100 I think), but that is the hottest it has gotten. If this is normal, please let me know, but to me it feels like it is getting too hot. When it does get this hot I normally turn on the heat to bring down the temperature, and it normally brings it back to around 85-90 degrees. I recently did an oil change and all of my fluids were at good levels. Does anyone know of some other things I could look into as to why the car would be getting so hot? Or is 100 degrees an acceptable temperature for this car to be running at in the summer with the AC on?

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Old 05-31-2006, 01:20 PM
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Ours ran a little bit warmer than that this weekend going down the interstate. It is still quite a bit from the red zone so I am not too worried. I did put a new OEM radiator in last year and the fans all seem to be working correctly. The V-8's all run hotter than the 6's.
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Old 05-31-2006, 02:49 PM
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How hot was yours at it's hottest? What is the highest temperature you would still feel comfortable driving? With the AC on, mine basically hangs out right below 100, I would say 99. Without the AC on, I would say it is anywhere from 90-95. That is, if the dash in between 80 and 120, not the one right next to 120, but the dash right in the middle, is indeed 100.
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Old 05-31-2006, 02:56 PM
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I think thats pretty normal. If you haven't changed coolant in awhile - flush out the old stuff and put in MB recommended see if that changes it.
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Old 05-31-2006, 04:40 PM
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My 300E heats up to 100 and sometimes more in stalled traffic when it is really hot out, and the aux fan kicks in.

In the past, my car would generally stay much cooler - even when stopped in traffic. My fans are all fine and I suspect my rad is past its due date.

Since yours is staying that hot while cruising, I would check your fan operation and if your rad is original, it may need replacing.
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Old 06-01-2006, 03:04 PM
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Thanks for all of the input. I just checked under the hood while the car was hot and still running, and it turns out the fan isn't working. Neither of the two fans up front by the grill were running, and they obviously should have been. Before I replace the fans, I was wondering if there is anyway to see if it is a bad connection or busted fuse? I posted a few days ago about my headlights and brake lights going out far too frequently, and someone suggested my battery might be outputting too much voltage. If this were true, could this also be a part of the problem of my fans? Also, my dashboard display light is out as well. Has anyone experienced a problem like this or at least heard of it? Thanks.
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Old 06-02-2006, 10:05 AM
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Bump this. Does anyone know if the cooling fans are connected striaght to the battery or if it runs off engine power? I am trying to determine the status of mine, as they aren't working, please read the above posts, Im trying to find out if all of my problems are inter connected
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Old 06-05-2006, 09:24 AM
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Old 06-05-2006, 11:19 AM
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Old 06-05-2006, 02:26 PM
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I will definitely try this if my fans aren't broken. But I am having a tough time at the moment establishing if the fan is broken or not. Does anyone know if the fan is powered directly from the battery?
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Old 06-05-2006, 02:41 PM
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Dont know if this will help you, but try running the engine and switching on the A/Con, the fans should kick in with A/Con on
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Old 06-05-2006, 04:11 PM
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i will, thanks for the suggestion.
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Old 06-13-2006, 04:31 AM
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400E Cooling

Hi, where do you live? In Austin, the temp has been in the upper 90's and the traffic is....depressing. So my 400e will climb past the 100 mark, and will kick on the mechanical fan via fan clutch gradually around 100(I think) and then the electrical assist fans start up around 107. So this is very repeatable and engineered on the part of MB. I'm not happy about it and may do the resistor thing. Keep good oil and good antifreeze in it. Read more about it on this site, you'll get to be more comfortable with it. Where do you live?
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Old 06-13-2006, 04:32 AM
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more cooling

probably my biggest concern is the transmission. It hasn't cooked the fluid yet, but can't be good for it, I should search for transmission cooler learning.
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Old 06-13-2006, 05:19 AM
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It sounds like you are on the right track, but I too, agree with the above poster who asked about when the coolant was last changed, to which I would add, how is the thermostat?

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