it was 101 outside driving 40 miles pretty good hills up and down going 65 mph, pulling a 10 foot landscaping trailer with a 0 turn mower on it, big fan came on and the water temp settled between the two zeros on the 200 stayed there until i got to town and went below the 200 mark, question is thermostat? the 16" pusher fan yall been talking about? or ????? 99 cummins temp gauge NEVER moved i dont know just dont see the reason why this cummins temp gauge moves so much.

 

Cuz its a fake controlled by the ECU to read what it THINKS you should see, as are the rest of the gauges on the dash. Every truck is a bit different but that sounds a little high. Check you coolers and make sure they are clear of leaves, bugs, and other FOD.

 

FOD FOD You must work on airplanes!

 

have not heard that term in a long time.

FODWALK! LOL

 

Seems to be the operating temperature for the weight and hills and outside temps.

I pull in those temps as well and mine will run there and so will my friends. It will also go a bit higher on the longer hills.

 

FOD = Foreign Object Damage


Thank you Google

 

Nah, 3 kids in the military, 2 of whom spend their time working on gas turbines and whirly birds. FOD is a way of life with them.


FOD = Foreign Object Debris, its context sensitive.

 

I run 200-210 under load, not a problem. I'm betting you'll find a boat load of crap in the lower 1/4 of the radiator, behind the AC condenser.

 

That one came up too

 

It appears that diesel engines are more efficicent at higher temps. 200* is not a high temp, and is nothing to worry about. get concerned when it's 220*+. Get worried when it's 240*+.

 

Like the other have said. Seems normal with a load and hills run 200-210 with the fiver hooked up. If you want to check few things look at the water pump pully and make sure it isn't wobbeling. If it is, its about to fail. Also you could do a flush and refil if over 150k miles.

 

These trucks have 190 degree thermostats. This means that the t stat STARTS to open at 190 and will continue to open untill fully open somewhere above 200.

 

thank for all the replies...