Robinair 75700 CoolTech Coolant Exchanger 10 minute exchange process means no more waiting for the engine to warm up Engine off feature removes pulleys belts and fan blades from the safety equation Vacuum mode creates a push/pull exchange process allowing the technician to safely remove high pressure in a hot system Leak check feature allows the technician to test for leaks prior to refilling Two external new coolant supply tanks allow on-board storage of two different coolant types