Engine Compression & Cooling System Tools

Why should a cooling system pressure test hand pump never exceed the pressure rating stamped on the vehicle's radiator cap?

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 Correct IncorrectOver-pressurizing will rupture plastic radiator end-tanks, blow the heater core seams under the dashboard, or burst aging rubber coolant hoses.

Why should a cooling system pressure test hand pump never exceed the pressure rating stamped on the vehicle's radiator cap?

• It will cause the engine oil to turn into jelly
• It breaks the pressure gauge needle
• It will discharge the battery
• Over-pressurizing can burst fragile heater cores, plastic radiator tanks, or crimped hose connections