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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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Why would the ignition switch run start feed fuse blow on a ford f250?
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