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Re: 86 F250 overheats with vacuum in radiator
Posted to Technical Discussion Forum on 2/3/2025

Any time one of my plow trucks would get hot at highway speeds with the plow installed I found the fan clutch to be faulty. Install a new fan clutch and problem solved.

The only one that didn't have that issue ever was an old Jeep pickup with no fan clutch. Login to read more.