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Old 08-07-2003, 02:28 AM
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Join Date: Jul 2003
Posts: 60
Cant Find Lower Temp Thermostat

I have been looking for Thermostat for 98 e320, all I could find is 87 C here in USA. I heard in Asia they sell lower temp Thermostat.

I dont know what the deal is maybe it has to do with the emissions here.

Does anyone know what temp they sell beside 87 C?

My temp is running around 90 97 C, I know mercedes tell people it is normal. However, I would feel comfortable running around 85.

I called the dealer here in USA and few other stores, trying to get a lower temp, no luck.

If anyone has any info about getting the lower temp Thermostat, please post.

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Old 08-07-2003, 08:52 AM
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Join Date: May 2003
Location: DC Metro Area
Posts: 365
Answer may be coolant temp sensor

Chances are that if your car is getting into the 90s - your thermostat is already at full open. In this case - a lower temp thermostat won't help. What will help is modifying the temp at which your auxiliary electric fans come on.

I'm not sure about an E320 - but on my 1995 E420 - there is a coolant temp. sensor that lives only to control the aux. fans. (a separate sensor gives temp signal to the engine computer). Jim F. has a website that shows how to modify this sensor to "fool" it into thinking that the coolant is hotter than it is - bringing the fans on at lower temperatures. Involves about $2.00 in parts - simply wiring a resistor in parallel with the sensor. You can choose your own resistance depending on how low you want the fans to turn on. I chose 1200 ohms (about 95 degrees) - but i believe that 1100 ohms will make it around 92 degrees.

Someone with an E320 whould be able to let you know if this is possible on your car. Anyone?

1995 E420 65k - trying to survive the dreaded evaporator failure
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Old 08-07-2003, 12:44 PM
Registered User
Join Date: Jul 2003
Posts: 60
I emailed jim, unfortunayely his cool harness does not applu to my car.
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