Posted: Wed Jan 05, 2022 9:37 am Post subject: M38 Overheating
While driving Jeep last Sunday, it overheated to the point of steam coming out of radiator cap relief. I shut it down, and after it cooled off I removed radiator cap to add coolant, looking down into the radiator I cannot see the tubes because of some sort of baffle. My problem may be a stuck closed thermostat, so i will remove and test, but also i need to flush all the crud in the cooling system. the real question is how to know when radiator is full if you cannot see top of the tubes. I will attempt to attach pic from my album.
Fill the cooling system with water, or antifreeze solu- tion, of sufficient strength to protect the system against the lowest anticipated temperature, to a level approxi- mately 1 inch below the bottom of the filler neck. _________________ Gary Keating
1949 C3A, 1952 M38,
1954 M170, 1957 Cj3B
Joined: Feb 17, 2012 Posts: 530 Location: Del City, OK
Posted: Thu Jan 06, 2022 8:51 am Post subject:
IMO time for a good flush... _________________ Hal, KB1ZQ
TSGT, USAF (Ret)
1952 M-38 CDN CAR 52-31313
1952 M-100 Strick #104
1951 Willys Wagon (For Sale)
1954 Willys M38A1 201001205
Tornado Alley
Del City, OK
Joined: Dec 10, 2017 Posts: 344 Location: Southern Maryland
Posted: Thu Jan 06, 2022 7:51 pm Post subject:
If it were mine I'd pull the radiator and turn it upside down and flush it backwards with the garden hose. If you put it on top of a 5-gallon bucket you can catch the junk and see how bad it is. Don't pressurize the radiator, just let the water run free. so you don't split a seam.
You can also run water down the thermostat hole and back flush the block as well.
Mike B _________________ Mike B
1953 M38A1 Brush Truck
1952 M38
1951 M100 Trailer
Joined: Nov 16, 2021 Posts: 73 Location: NE Washington
Posted: Mon Jan 10, 2022 12:56 am Post subject:
Lord knows, I'm no mechanic...but with every restoration I have done, cleaning/flushing/repairing or replacing the radiator is one of the first things done.
If you don't know the service history of a car and you plan on driving it, it just makes sense. _________________ 1955 M38A1 MD 82551
Former owner/restorer of 1977 CJ-5, stock with factory V-8.
Used as a daily driver for seven years.
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