Originally Posted by itch
95 D90 inches up to the red-zone on the temp gauge while plowing through sand or muck and really working the engine on hot days. It also does so if I leave it idling in 90+ temps. Everything has been recently overhauled including the electric fan. My question is, should the fan kick-in at some threshold? It only turns on now when the A/C is switched-on. I seem to recall that prior to the overhaul the old electric unit did come on automatically when the temp started climbing. IF so, then is there an easy way to get it back to being automatic without installing a separate switch and relay?
I just had this discussion last week with Peter @ J.White's in Framingham.
Peter was shocked to see that I was running a 100% manual switch with an electric Kenlowe puller fan with stock radiator and 300Tdi. I have never used the fan (only to make sure it still works) and the temp never gets to halfway, just hovers slightly below halfway. We checked with an infrared and it was between 180-190 at the head (which is where its supposed to be).
It may depend on your engine and cooling system, but the point here is that Peter had a pretty solid solution for an automatic switch for the electric fan. I simply don't see the need for it in my case. I have never come close to overheating and shoudl I ever really stress the motor by towing longances or crawling through sand when it's 100 degrees, I'll definately be vigilant of the gauge.
Find Peter at J.Whites in Framingham (508) 872-4752.
Again, my setup is much different than yours but an automatic electric fan setup is pretty simple to set up properly regardless of your type of engine.