hey i got a 96 dodge cummins, 2 door, 2wd, loving it a lot, apprx has 223.546km on it. I noticed the engine temp bounces around from 50-90, even when warmed up,
once its warmed up and say im drving on the highway it will be at 85-90 w/e average is then it takes about a minute for it to drop to 50-60 then it takes about 5 mins to hit 90 again
dsont blow white smoke when i start it
the rad cap is also cold when warmed up???
help me out here????

 

If you engine temp doesn't reach proper operating temp, your t-stat is probably stuck in the open position. The engine is being " supercooled". Change the stat and you should be fine.

Good luck with your ride.

 

its completely normal., have not seen a 94 to 97 that does not do it, Its fine

 

hey thanks

what are some tests i can do, to determine if its the thermostat? It blows good heat out of the heater. Do you think it could be a head gasket problem? What are some test that I can do to determine that the head gasket is at fault? Any help that you can provide is greatly appreciated?

 

If it was a head gasket you would know it without a test, Change the thermostat if it needs it or not. It probably is the original. Good Luck

 

you can test the t-stat in hot water. it should open around 180-200F (68-79C) and you can visualy see it open up. if it opens sooner then the wax on the inside has been contaminated. if it is open when you pull it out then you can easily tell you need a new one