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You might carefully check the air solenoid that controls the fan. It dumps air to engage the fan. Mine appeared to work fine on the bench but when put under load in the truck it failed to vent the air between it and the fan clutch. It was very intermittent in the beginning. There was no...

I have the exact same overheating issue on my unit. My overtemp light comes on at 230 on the gauge. I do not hear the fan come on when the heat rises, however. Fan clutch engages when the air is removed as it should. The solenoid that controls the air is working as it should. However, there...