Quote:
Originally Posted by crazy4diesel
Hello all,
The temp rises more than I would like even on local short grades. At idle is sits just above the 80 mark, and then there is another unnumbered mark which I am going to assume is 100. When ever I hit the slightest hill for much distance, the needle starts headed toward that 100 mark, it hasn't actually reached it yet, because I back off the throttle, and turn on the heater, which helps for a second, but then once the heater core water is up to temp, and circulating with the rest of the water, the temp starts rising again.
Here's what I've done:
Replaced the thermostat, water pump, all hoses, and tested the heater core (way back when I had the engine on a stand).
Replaced the fan clutch (just today)
The water in the upper hose is HOT, and the water in the lower hose remains quite cool, surprisingly cool in fact.
What should I try next?
I should mention I removed the auxiliary water pump from the heater hose line, and I am running Evan's waterless coolant.
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Idling above 80C, an immediate temp rise when even moderate power is called for, and a cold lower hose, all point to lack of circulation through the radiator. The only circulation is through the bypass circuit, which does not provide any heat rejection other than the heater core.
Suggest inspection of the thermostat, and/or exchange with another one as a first step. Stealth rags have been known to sneak into hoses in the dead of night.