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Thanks for the tip regarding the fan. I always questioned it's operation because it seems to me that it runs like a fixed fan? Running fast/normal speed. but i will unplug the module and see if i get a difference.
"Big block, small block", really won't matter as much as a gas engines thermal efficiency being different than a diesel engine. Biggest factor is how the cooling system is designed for X engine and vehicle, but you always have minor discrepancies between like makes an models-especially on older vehicles like we are comparing let alone the temp gauges not being extremely precise either.
My fan engages around 220 an kicks off around 200, which is about normal per the TM. I haven't put my laser thermometer on anything to check it so it could be slight variances in our gauges too-I would say your good though.
When my fan was running all the time (bad temp sensor) I don't think it ever got above 180 when driving around in the mid 80s.
Oh yeah? ok i will check that and I'm going to check all that stuff and thinking about a complete cleaning of the cooling system. But what your opinion on running with out a thermostat? I'm not worried about heat she's not a winter machine, i was thinking without a thermostat i will gain maximum flow?
Running a Diesel without a thermostat especially in cooler climates is not a great idea. Diesel engines need a little heat to function and the thermostat lets heat build up prior to allowing cooling.
Got it.
I second the not a good idea to not run a t. stat unless in a dire situation of course. It probably wouldn't get over 150 degrees on most days-its remarkable how cool engines can run with out one. I highly recommend a coolant flush, when I did mine I had chunks of gunk and rust colored water for several minutes. Its also a good time to replace all of the coolant/radiator hoses while your doing it too. I drained my coolant, an filled with water, added a "flush additive" an ran it till it got warmed up, drained it, refilled again with water, ran it, drained it again. Then I took a garden hose an crammed it into every hose, an outlet an flushed an flushed an flushed until the water looked the same coming out as it did going in.
thermostwic switch in the left water cross over....that's where the temp reading is taken from and allows or denies
It is certainly sounding like an electrical issue at this point. I would check for continuity from the sensor back to the controller. Might have a broken lead. Sensors can go bad but not very common.
Someone buy this man a steak sandwich. I swapped over the thermostatic switch from a "good" truck and I think everything is copacetic now. It is cooler now and I could not get the truck above 210, but I am fairly certain I heard the fan kick on. I'll have to give her the once over again tomorrow, after a put back together the three other trucks I cannibalized for parts.
I am a simple monkey, so swapping a part is easier than the whole proper diagnosis thing.
If the situation turns south again tomorrow I will properly test the sensor as you suggested.
From the article: "So you hook it to one battery, then wire it to the transmission control light, giving you the 12-volt ignition source you need."
