Hey people just want some feed back on this problem i am having with my sprinter, firstly it is a 4agze with a turbo and no supercharger, i have had a twin core radiator made for it and it had twin thermo fans that work well. i am using the water pump housing of the original motor because the hose fits on the front of the engine not the back.
The problem is that when the engine heats up, the temp gauge will go right up almost to the red and when i hit 4000rpm the gauge will come instantly back to the middle then slowly creep back up to the red until i hit 4000rpm again.
Whats going on and what are some things to look at??