How to use a pressure tester to find a coolant leak
https://haynes.com/en-gb/tips-tutorials/how-use-pressure-tester-find-coolant-leak
WebOften, a leak will only be apparent when the engine is hot; as the temperature increases, the cooling system pressurises, the coolant finds the weakest point in the circuit and tries to escape. The best way to find this kind of leak is by using a pressure tester.
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