hi Jim,

BTW, thanks to the other thread I found why my low speed wasn't working w/ A/C - the fuse was blown! Replaced it - et voila!

Now on to this cooling mod - did that ever get resolved as to whether or not it works on e series?

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joE
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
http://banners.wunderground.com/bann...L/Key_West.gif

key is the fact that it's a V8 not the 'E'. So it has the same compliment of sensors as shown in the picture on my page.

All you need is a 1.1k ohm resistor and a little solder, so have at it!

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Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page

Just wanted to add, I observed the same thing as decribed by screedchan today during my trip from Vancouver to Bellingham...while waiting at the Canadian/American Peace Arch border crossing to come back into Canada for around 40minutes, I noticed how the coolant temperature would shoot right up to 110C, then the fan comes on to take it down to 100C...happened 3 or 4 times during the 40 minute wait...A/C was off...temperature reading on dash said 20.5C...after I got up to speed on the highway with the A/C on again, the coolant temperature quickly dropped down to a little above 80C...wow...this is one HOT operating car...

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1995 black pearl/black Mercedes-Benz E420 :

I’ve got the "resistor mod" on my 94 E420 and now shes now cool as a cucumber....well not that cool because you do want to reach normal operating temps. I think I may do this to my 300E before I go to Florida. If I recall, I used a 1.1kOhm resistor.

Andy, since I'm still having problems I'd like to verify if this picture I've attached is the resistor you and benzmac have been referring too. A coil in the middle of this? At what points do I measure the resistance, and what values am I looking for when the car is off? If this resistor is bad, would that cause my cooling problems?
thx...

forgot the pix

Attached Thumbnails

 

Benzmac,

Can you describe where the low speed fan resistor is located on a 92 500E? I'd like to check mine for good measure. TIA


Steve,

The temps on my car can see up to 106 after hard driving and or altitude. I've also experienced 110F at plus 4500Ft altitude, 98F and hard driving.

Try changing your coolant ratio to 40% Coolant/60% Water. We don't have problems with freezing in San Diego. so this will benefit the cooling system. I've found a good synthetic oil also helps keep my car running better.......I know it sounds weird but it's worked.

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Afshin

Current:
02 C32 AMG

Previous:
92 500E
84 190E 2.3 5 Spd

In my experience with this complaint here is what I discovered.

The placement of the Right side auxiliary fan sits directly in front of the fan clutch assembly on the 124 and the 129 chassis cars with the 119 engine. Both of these models have had excessive engine temperature issues from day one. Traditional MB owners were use to seeing their cars run at 80 solid and not wavering from that unless it had a problem.

My thought is this. The placement of the aux fan blocks a good percentage of airflow directly to the fan clutch. Without direct airflow to heat the bi-metal strip than how is the fan going to engage? Heat transfer through the water pump? Heat transfer around the blades of the fan? The bi-metal strip should get direct influence form a reliable air stream as it was designed.

My solution to bring the temp into an acceptable range for stop and go conditions was this. A 15 turn 2k potentiometer, dialed it in to 1405 ohms, than soldered it parallel to the blue temp switch which controls the fan(s). The temp stays below 95 and the oil pressure stays above 1 bar now.

I am going to experiment next summer with removing the right side fan to see if my suspicion is factual or preposterous.

I spent many hours with this problem mainly because the oil pressure was below 1/2 bar on really hot days with the a/c running.

FYI: Voltage measured across the blue switch 1.74 (approx) turns the fans on and
1.55 (approx) turns them off.

These cars REALLY do run HOT!!! I've been experiencing the same temperature range of my car even with 45F weather. I thought highway driving would bring the temp down a bit (hovering at 82C) as the cool air would pass through the radiator but it didn't make any difference.

This was one of the reasons I replaced the foam hoodpad because of the deterioration from the excessive heat. I would also be interested in what "MrCjames" discovered after removing the right side (passenger) aux fan. It does seem to be a weird design as the fan clutch is off center.

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'94 SL500 Tourmaline Green, 120K miles as of February 27, 2005.

http://home.earthlink.net/~boudreaux...ictures/17.jpg
Updated photo September 2004