My Power Wagon runs very cool otherwise. Engine runs great, and it will cruise all day long on the highway at 70mph, and will run in traffic for hours no problem. But that one time on a very hot day, bam, temp shot up and the lower hose was sunk in.

I've done a ton of work on this engine. Just about everything but piston rings. It's had complete valve job, new cam and lifters, radiator, freeze plugs, timing chain, water pump, thermostat, hoses, belts, plugs, wires, ignition, timing set, headers, dual exhausts. It's squared away. I've since bypassed heater since core is at rad shop right now being repaired.

It did not overheat in traffic that time because of something else. I'm going to get a spring for lower hose (or wire if you want to be technical). Thank you to those with helpful answers.