What kind of water do you use to flush a radiator?
What kind of water do you use to flush a radiator? Flush the radiator with tap water until the drainage runs clear. Repeat filling the radiator with 1 gallon (3.8 L) of tap water, running the car with the heat on, and draining it once it’s cooled. Once the water runs clear, flush the system one last time with distilled water. [12] Can a defective radiator cap cause engine to overheat? A defective radiator cap will cause engine overheating in a number of ways. Three of the ways a radiator cap can cause overheating are, 1) Not holding in pressure...