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International Automotive Technicians Network
Re: 86 F250 overheats with vacuum in radiator
Posted to Technical Discussion Forum on 2/4/2025

I see older Ford trucks here routinely, and the overflow ALWAYS has some brown crud in the bottom of the overflow tank blocking free flow in either direction.

Just pull the overflow hose off the radiator neck. I bet a dollar that you can't blow a bubble into... Login to read more.