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#1
12-10-2005, 05:25 PM
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A few thermostat questions
I opened up the thermostat housing on my 240D to check the tstat. I expected it to not be there since it was running way cool. Instead one of the legs of the tstat was broken ! It was a MB OEM marked one. I put in one I got from my local parts house, it was a french made Calostat , I think ? I hope that's OK. But here is my main question. It appears there were two types of tsat housings, one with a bypass. Performance products actually shows two different part numbers for the tsats. My car does have the bypass. Is there any difference between the tstats (bypass / not bypass )themselves, if they are both marked 80C ? At idle the 240D today is only getting up to 60C in my driveway. I have not taken it on the road yet after the change.
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David McDonald 1981 240D 1985 300D (wrecked) 1985 300TD 365,000 miles 1969 Mustang Fastback 
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#2
12-10-2005, 05:43 PM
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Dave - there have been issues with aftermarket thermostats not being up to the quality of a rebuilt factory unit. The clearance of the impellers is sometimes not the same causing overheating problems usually.
Len
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#3
12-10-2005, 06:34 PM
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Quote:
Dave If the car is running at normal temps then it should be OK. Around 80C. If not then get a OEM unit. It is a good idea to test the thermostat before installing. Place it in a pot of water. Insert a thermometer and turn on the heat. As the temperature approaches 80C the termostat should start to open and be fully oepn by 80C. This way you know the unit is good before installing. Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car
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#5
12-10-2005, 07:53 PM
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drive it before
making any judgements. in cold weather a diesel wont make if any much heat at idle.
tom w
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[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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#6
12-10-2005, 11:47 PM
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I offer no technical support to the thread...
BUT YOU BOUGHT FRENCH??? French parts, German car... The cars going to eat your thermostat  ~Nate
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95 Honda Shadow ACE 1100. 1999 Plymouth Neon Expresso. 2.4 swap, 10.5 to 1 comp, big cams. Autocross time attack vehicle! 2012 Escape, 'hunter" (5 sp 4cyl)
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I saw thermostat, I read thermostat, I typed thermostat, but my mind was thinking water pump. 
Linear Mode
