Mud in my Veins
Join Date: Dec 2000
Location: Memphis, TN
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Re: Mystery of lost Anti-Freeze 2!
Ford truck engines are not noted for suffering from air pockets, so I doubt it's that. The fins are only pressed (not welded) onto the shaft, but they rarely fall off - usually just slip giving insufficient flow under heavy load. I'd yank the thermostat first since it's the cheapest to check/replace. Also, look at the lower hose to make sure it isn't collapsing. It should have a spring inside to hold it open, but they rust. You didn't shove a rag in there to catch drips while you were changing the rad, did you? :-)
83 Custom w/95 4.9L EFI, 78 NP435, 83 NP208, 83 D44IFS 3.07, 87 Ford 8.8ABS 3.08, Michelin LTX AT 31x10.50R15