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  #1  
Old 11-12-2001, 11:12 AM
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Join Date: Mar 2001
Posts: 40
Question Cooling temp drop

I just happen to notice that my 190E 2.3-16 cooling temp drops to 80 degree Celcus from the norm of 100 degree Celcus. Althought the embient temperature in New England is getting cold, but I have never notice this much changes before. Is this mean that my thermostat stuck open? or could it be something else.
This car has 180K miles and still loving it.

Alex
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  #2  
Old 11-12-2001, 12:44 PM
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Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596
Alex Vantu,

I have changed my thermostat twice in 202,000 miles on my 190E 2.3-16 for this exact reason. The engine will start to run cold all the time, and it gets crummy mileage. Good Luck, Jim
__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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  #3  
Old 11-12-2001, 02:20 PM
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Join Date: Mar 2001
Posts: 40
Thanks Jim,

I will replace my thermostat right away.

Alex
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  #4  
Old 11-12-2001, 06:46 PM
pmizell's Avatar
Benz Zealot
 
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
??

Since when is 100 degrees C the norm? My needle typically sits right on top of the 80 mark and I thought this was normal. Other times with the AC off and in cool weather it sits in the middle of the 80 mark.

Every Benz I've driven in my family has always been this way. Is this atypical?

Thanks...

~Paul
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  #5  
Old 11-12-2001, 07:25 PM
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Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596
I believe the thermostat for this car is set to open at 87 degrees Celsius. That is what is stamped on the body, and I have boiled a few in the kitchen with a thermometer in the pot just to check them.

Given the differences between one car and another, seeing the needle favor the 100 degree mark rather than the 80 degree mark is not unusual. But if the needle is on the 80 degree mark or below it after the oil temp is near 100 degrees C you have a worn out thermostat.

The "right on 80" thermostat is what I am familiar with from my Diesels, which typically run like they have an ivisible peg in the instrument on the dash that keeps them from going over 80 or 82 degrees C.

Jim
__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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