We are looking at an old Hyster H60XL S/N A177B - 1985 and the fault is that within less than 5 minutes of idling from cold the coolant temperature guage reads in the red, but the coolant is not excessively hot (can easily feel water with finger). The guage does seem to operate correctly but always reads too high and shows overheating when the truck is clearly not overheating.
We have removed the thermostat
Checked the wiring for short circuit and resistance (according to manual).
Checked engine earth
Replaced temp sender (twice)
Relpaced guage
but problem persists. Can anyone tell us the resistance readings we should be getting from the temp sender and across the guage? or can anyone offer us any more ideas?
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