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willysmjeeps.com :: View topic - M38 Overheating
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M38 Overheating

 
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redrad
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Joined: Sep 17, 2020
Posts: 33
Location: Cresson, Tx

PostPosted: Wed Jan 05, 2022 9:37 am    Post subject: M38 Overheating Reply with quote

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.

http://willysmjeeps.com/v2/modules/gallery/albums/album718/IMG_2776.thumb.jpg

Well that did not work out very well
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Johnny D
1951 M38 Ser#1723
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keats
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Joined: Apr 14, 2005
Posts: 332
Location: Middletown Ct

PostPosted: Wed Jan 05, 2022 10:55 am    Post subject: Reply with quote

from the manual.


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.
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Gary Keating
1949 C3A, 1952 M38,
1954 M170, 1957 Cj3B
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redrad
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Joined: Sep 17, 2020
Posts: 33
Location: Cresson, Tx

PostPosted: Wed Jan 05, 2022 7:34 pm    Post subject: Reply with quote

Thanks for the info, Gary
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Johnny D
1951 M38 Ser#1723
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redrad
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Joined: Sep 17, 2020
Posts: 33
Location: Cresson, Tx

PostPosted: Wed Jan 05, 2022 7:40 pm    Post subject: Reply with quote

[/img]
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Johnny D
1951 M38 Ser#1723
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OKCM38CDN
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Joined: Feb 17, 2012
Posts: 530
Location: Del City, OK

PostPosted: Thu Jan 06, 2022 8:51 am    Post subject: Reply with quote

IMO time for a good flush...
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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
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Mike_B
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Joined: Dec 10, 2017
Posts: 336
Location: Southern Maryland

PostPosted: Thu Jan 06, 2022 7:51 pm    Post subject: Reply with quote

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 Smile
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Mike B
1953 M38A1 Brush Truck
1952 M38
1951 M100 Trailer
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redrad
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Joined: Sep 17, 2020
Posts: 33
Location: Cresson, Tx

PostPosted: Sat Jan 08, 2022 10:44 am    Post subject: Reply with quote

Next warm day I am pulling thermostat and flushing engine and radiator,
Thanks as always for the tips
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Johnny D
1951 M38 Ser#1723
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JBJeep
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Joined: Nov 16, 2021
Posts: 63
Location: NE Washington

PostPosted: Mon Jan 10, 2022 12:56 am    Post subject: Reply with quote

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.
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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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