hondat,
Use tap water without too many minerals in it if possible. Use distilled water only in the battery. Antifreeze needs some impurities in the water so it can mix properly.
You can check this out with the companies that make antifreeze.
'31 Chevy 1 1/2 ton,
'42 GMC 2 1/2 ton 6x4,
'52 GMC 2 1/2 ton 6x6,
'53 GMC 5 ton
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