Hello all

Last trip in the truck (1996 5 spd) the engine was running cool, around 160/170, even after 2 or more hours on the freeway. I am going to replace the t-stat and would like to know if anyone has the part number for the "improved" t-stat that doesnt cycle from cold to 190 to cold, etc as bad as stock.

Thanks

Eric

 

Cummins says,

THE COOLING SYSTEM USED ON THE CUMMINS DIESEL ENGINE EQUIPPED VEHICLES PROVIDES THE CAPACITY AND PROTECTION OF THE HIGHER GVWR AND GCWR RATINGS AVAILABLE ON THESE VEHICLES. OWNERS SHOULD BE ADVISED OF THE NORMAL SLOWER WARM UP AND LOWER ENGINE OPERATING TEMPERATURES ASSOCIATED WITH DIESEL ENGINES.

THE COOLANT TEMPERATURE GAUGE WILL FLUCTUATE ON DIESEL ENGINE EQUIPPED VEHICLES. IT IS INFLUENCED BY VEHICLE LOAD, OUTSIDE AMBIENT TEMPERATURE AND EXTENDED IDLE TIME. THIS FUNCTION IS CONSIDERED NORMAL

 

I think you actually have the updated one. i got the updated one and didn't like it because it ran to cool, so i went back to stock. it cycles from 160 to 200 degrees all day long, it is normal.