Symptom: An engine’s cooling system is overheating. The coolant level is low, but there are no visible leaks and no water in the engine crankcase to hint of water jacket or cylinder head problems.

This online, No.42 Radiator Test Cap for Late BMW and Land Rover Astro online, US PRO 18pc Coolant System Pressure Tester Kit 5260 online, How to Pressure Test a Radiator Cap YourMechanic Advice ...

Caps on motor oil bottles, pop bottles and beer bottles keep the liquid in. But a radiator cap is not any ordinary cap. Though it seals the cooling system from the outside, the radiator cap is ...

Using dry nitrogen to pressure test a system is a very effective method of verifying a system is leak-free. In fact, I believe it is more reliable than using a standing vacuum test typically performed ...