Well designed tester, unfortunately he couldn't deliver. the air in the cupped hand changed the color of the liquid from blue to green, as it should. When inflating a manual balloon on the 2nd or 3rd compression it creates a vacuum that it can't break unless I lift it slightly to let air in. Maybe this will affect my results, but if I don't do it this way, the lamp can't draw air. After this error I drained all the coolant and ran the coolant cleaner with water. With the radiator cap off and no thermostat idling, I saw bubbles in the coolant rising to the filler neck. It should have been exhaust fumes, but the detector couldn't see any exhaust fumes. This reviewer disappointed me. I will ask for a refund.
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