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Puzzling overheating

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  • jackb
    replied
    if you hadn't pulled the expansion plugs to check for gunk in the block, don't trust the drain cocks to tell you what's back upstream. I also had this same problem with a clogged radiator. Ran @ 170 around town, boiled over at 60 mph....gotta check everything..start with radiator temp, sending and dash units.....keep going...GL

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  • Gunslinger
    replied
    Temps going up at highway speeds and not slower speeds can be indicative of a bad lower radiator hose. If the hose's internal spring is rusted away or collapsed the hose will close off under vacuum at higher speeds and restrict coolant flow.

    Check that lower hose and see if it squeezes too easily...if it does, replace it with a new hose and spring.

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  • 62champ
    replied
    Really want to make sure it is actually at that temperature. Local flaps around here always have an infra-red thermometer behind the counter.

    Other question would be this: Is this high temperature seen only when the car is running down the road? Does it cool down when the car/engine are running at slower speed - say in town or similar?

    My '60 with L6 will run warmer going down the road at 60 mph. When you get off the highway it will come back down to mid-gauge or lower. My Dad said the 1950 Champion my grandparents had would always run at 3/4 on the heat gauge during the Texas summers. He said the instant you got into town it would start creep down. If you stopped at a stop light for a minute it would go back down to normal.

    Good luck

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  • rkapteyn
    replied
    Check the head gasket.
    Flaps sell a compound that makes your coolant turn color when exhaust gas gets into the cooling system.
    Retorqing the head gasket sometimes works but do not count on it.
    When hot exhaust gasses get into the cooling system, it will overheat!!
    Robert Kapteyn

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  • K Russell
    started a topic Cool/Heat: Puzzling overheating

    Puzzling overheating

    I flushed out my cooling system in my Champion 6, removed the drain plugs and found very little crud in the system, then installed a new water pump from Studebaker Int'l a couple months ago. The high coolant temps of the past disappeared, running at 180-190 degrees after the job was completed. About 250 miles later though, the gauge reading has steadily climbed to 210, or slightly higher if I've been running at steady highway speeds for even 10 minutes. Such a change in such a short time tells me something is definitely wrong but since I'm seeing no loss of coolant out of the overflow after stopping, I'm wondering if it's possible the sending unit has suddenly failed, resulting in a high reading, or are there other areas I should be looking at? I've never had a thermostat fail in the summer but since this has been a 3 week transition it wouldn't seem like that could be the answer, or could it be?
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