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Old 05-30-2007, 02:46 AM
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Join Date: May 2007
Location: Arizona
Posts: 760
Cooler Thermostat

I have read suggestions in other forums that installing a thermostat that opens at 80 C, rather than my stock 85 C, would keep the engine and the a/c cooler. Has anyone done this, or does anyone have any thoughts on the down side of doing so?

I once installed a Paxton supercharger on a 1992 Camaro Z-28 and Paxton recommended that I install a cooler thermostat (180 F v. 195 F), just to trick the computer into running richer, in order to reduce the detonation caused by the 10 lbs of boost.

Maybe a cooler thermostat wouldn't do anything beneficial for the cooling, but I just wanted to get some input from more knowledgeable people.

1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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Old 05-30-2007, 05:56 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 38,669
a cooler stat could benefit the car by making underhood temps lower, being less wear and tear on the rubber parts, etc.

the benefits for cooling would be small, i think.

i am not sure how it might affect the computer, etc. others more knowledgable can probably comment on that.

it might cause more emissions.

tom w
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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Old 05-30-2007, 08:05 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
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IN most cases a cooler thermostat will not lower engine temps in the summer!

The 400E's will run at 100C + higher in the summer. That is normal.
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Old 05-30-2007, 01:18 PM
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Join Date: Jun 1999
Location: Albuquerque, NM USA
Posts: 1,947
Cooler thermostats are a mistake often proposed by those that can think only in general terms rather than understand engineering.

IC engines run most efficiently at higher tempereatures and your computer controls expect the thermostat MB installed.

Anything else is a mistake and hurts rather than helps.
Kent Christensen
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
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Old 05-30-2007, 01:27 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
As Doc said, 400e run hot in sumer, so I would do that resistor mod I mentioned in your other thread for lower aux high fan cut-in

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