Replacing the Thermostat and Gasket
#16
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Join Date: Nov 2011
Location: Divide, Colorado
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good write up! i did my tstat and gasket and wasnt sure which way the tstat went in. it will go in both ways so be careful, and so will the seal. also, i found a shortcut rather than taking off the alt and belt, just undo the upper alt bracket and rotate it out of the way!
#17
Good write up, I just changed out my thermostat but it only has one jingle hole not two, Do you have that part number for the Cummins T-Stat? I may need to change it out if this one gives me problems.
#18
DTR's Night Watchman & Poet Laureate
Thread Starter
Sorry, I dont, however your local dealer or parts shop should have it.
#19
Registered User
And the magic number is,,,,,,,
3972071 and the gasket is 3923331.
The previous one I bought from Dodge looked exactly the same.
3972071 and the gasket is 3923331.
The previous one I bought from Dodge looked exactly the same.
#22
Registered User
#24
Registered User
Mine leaks if I don't. The surface is pretty rough.
#25
I'm wondering if I need a new thermostat.
I picked up a E350 w/1st gen in 80 degree weather and it ran in the lower "normal" range. Ford van gauges don't have numbers.
When I drove the van back up to 40 degree Iowa, the engine temp barely reaches the "normal" range. Im guessing the stat never opens since I'm not towing? or stuck?
When I owned a CRD jeep, I was told I was loosing mpg when the thermostat ran cold. Would that also apply to my 1st gen cummins?
BTW. Mt dodge dealer gave me the stat # of MD972903 which included the gasket.
I picked up a E350 w/1st gen in 80 degree weather and it ran in the lower "normal" range. Ford van gauges don't have numbers.
When I drove the van back up to 40 degree Iowa, the engine temp barely reaches the "normal" range. Im guessing the stat never opens since I'm not towing? or stuck?
When I owned a CRD jeep, I was told I was loosing mpg when the thermostat ran cold. Would that also apply to my 1st gen cummins?
BTW. Mt dodge dealer gave me the stat # of MD972903 which included the gasket.
#26
Registered User
That is about were both of mine range, except on a hot day towing through the mountains. Then it will climb to mid way or a bit higher.
#27
Registered User
I'm wondering if I need a new thermostat.
I picked up a E350 w/1st gen in 80 degree weather and it ran in the lower "normal" range. Ford van gauges don't have numbers.
When I drove the van back up to 40 degree Iowa, the engine temp barely reaches the "normal" range. Im guessing the stat never opens since I'm not towing? or stuck?
When I owned a CRD jeep, I was told I was loosing mpg when the thermostat ran cold. Would that also apply to my 1st gen cummins?
BTW. Mt dodge dealer gave me the stat # of MD972903 which included the gasket.
I picked up a E350 w/1st gen in 80 degree weather and it ran in the lower "normal" range. Ford van gauges don't have numbers.
When I drove the van back up to 40 degree Iowa, the engine temp barely reaches the "normal" range. Im guessing the stat never opens since I'm not towing? or stuck?
When I owned a CRD jeep, I was told I was loosing mpg when the thermostat ran cold. Would that also apply to my 1st gen cummins?
BTW. Mt dodge dealer gave me the stat # of MD972903 which included the gasket.
I replaced mine and i can see it warm up to the second line then the tstat opens and it will drop down. It will slowly come up to just above the first line i think when it has reached a steady temp.
#28
I think the stat is stuck, or I never pushed the amount of fuel needed to warm up?
All I know is it should run warmer but if the fix is a piece of cardboard, I don't want to replace it since the PO said it was new and running cooler than the old stat. But its all hear say..
#30
The easiest way to tell is to get out and check the temp of the radiator when the engine has been running for long enough that it's warm, but not up to operating temp. If the radiator is about the same temperature as the engine, then the stat is stuck open. That was my big problem. After I replaced it, the radiator stayed ice cold until it got completely warm.