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I have some unmarked red coolant. Is there a way to know if it is 50/50 or full strength? Can you check red coolant with regular coolant strips? Thanks!
If the coolant is 50/50 and not concentrate, then check the temperature for which it is good for. If in fact it is 50/50 it should show close to -34 degrees. If concentrate I would think it will show much lower.