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Old 09-13-2008, 07:52 PM
Join Date: Nov 2007
Location: Knoxville, TN
Posts: 337
Thermostat and Mileage

Can having a proper functioning thermostat affect mileage?
Mine was messing up so I just took it off and I haven't gotten around to putting the new one on yet.

1984 300D Turbo
1980 300SD Sold
1983 300TD Sold
Dagger 16 ft. Legend Canoe (for the weekends)
Marin Northside Trail Mtn. Bike
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Old 09-13-2008, 08:06 PM
Posts: n/a
There MUST be a thermostat in the system for it to flow water correctly. Its a mixing valve and without one the water will just circulate around the block and not get cooled.
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Old 09-13-2008, 08:14 PM
Mister Byrnzoil's Avatar
Currently Benzless :(
Join Date: Jan 2005
Location: Palm Springs, CA
Posts: 777
proper operating temperature (or even a wee bit hotter) and good MPG are related.
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Old 09-13-2008, 08:32 PM
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Join Date: Mar 2008
Location: Wilmington, NC
Posts: 202
I thought that it was just me but --- my 300SD gets better mileage when it runs hotter. My radiator is dirty and I need to clean it but the mileage is up and I don't want to mess that up. 27mpg at highway speeds (70 +) compared to 24.-- normal

85 300SD 248k

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