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if you can read voltage in the water of a radiator , then there is a problem and the water needs to be drained and flushed and new antifreeze installed . if you are using full strength antifreeze, it must be mixed 50/50 with distilled water only. never use tap water in a radiator ! Thanks Jim T

Another viewThere is a specific problem that can be checked with a volt meter, I do this every major service (spring and fall)

I check coolant voltage with engine running to engine block and chassis.

If you read more than the error level for the meter you have a ground problem and this is grounding through the cooling system and will damage the cooling system. Most likely the radiator

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Q: Can coolant be checked with a volt meter?
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