I decided to replace the thermostat because I am having bad fuel mileage (17-18 mix 65% highway 35% city) and my engine temperature won't go over 80C and I read somewhere that a bad thermostat may be the cause. (Before that I thought the cooler engine temp is the better for the engine).
The job is simple for DIY rookie like me, just remove 3 10mm screws (# 1,2,3 on the pic) on the housing cover using a rachet with a long extension. That should be done on a cold engine.
Unflug connector #4 else the cable will be in the way when removing the housing cover.
The cover and the old thermostat may sit tight perhaps because of the gasket sticking tightly, just use a little force. The spillage is minimal, about a cup of coolant.
Remove the thermostat and put the new one together with a new gasket in.
Attach the cover, start the engine and check for leak.
1: new thermostat
2: base of housing
3: housing cover, displaced
4: old (bad?) thermostat.
have a feeling (no) a thermostat did not help his mpg.They are set at 87c run normally about 80c which is where his was and with the new stat probably still is.Cool weather about 80c hot weather about 90c.
100 k miles replace the o2 sensors
bump up tire pressure a few pounds
clean your maf
take out junk from the trunk
ease up on the pedal
those will help
I'm stuck in a small town with a bad thermostat..just downloaded your article an showed to the mechanic in a small town garage....we r pulling the therom..punching a hole in it and I m back on the road till I can fine civilization with a MB parts department...
u a life saver...
signed stuck in podunk
Quote:
Originally Posted by texholdem
I decided to replace the thermostat because I am having bad fuel mileage (17-18 mix 65% highway 35% city) and my engine temperature won't go over 80C and I read somewhere that a bad thermostat may be the cause. (Before that I thought the cooler engine temp is the better for the engine).
The job is simple for DIY rookie like me, just remove 3 10mm screws (# 1,2,3 on the pic) on the housing cover using a rachet with a long extension. That should be done on a cold engine.
Unflug connector #4 else the cable will be in the way when removing the housing cover.
The cover and the old thermostat may sit tight perhaps because of the gasket sticking tightly, just use a little force. The spillage is minimal, about a cup of coolant.
Remove the thermostat and put the new one together with a new gasket in.
Attach the cover, start the engine and check for leak.
1: new thermostat
2: base of housing
3: housing cover, displaced
4: old (bad?) thermostat.
Vehicle: E300TD 1997 W210 Running on chippie oil at 99.8%
Location: scotland, Edinburgh
Posts: 106
Hello, I have been loking at the DIY section for replacing the o2 sensor on a w210 but canno find any pictures/ post ? Anyone as any link? Thanks. Olivier
.
Thanks 
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