Chasing an overheating engine or a slow coolant loss? A radiator pressure tester pinpoints leaks fast — without guesswork. Here's how to use one safely.
Before you start
Work only on a cold engine. A hot, pressurised cooling system can spray scalding coolant. Wear gloves and eye protection.
Step by step
- 1. Remove the radiator cap and fit the correct adapter from your kit.
- 2. Connect the hand pump and slowly pressurise to the system's rated pressure (usually printed on the cap, ~1.1–1.4 bar). Don't over-pressurise.
- 3. Watch the gauge. If pressure drops, you have a leak.
- 4. Inspect hoses, the radiator, water pump and connections for drips or wet spots.
- 5. Test the cap separately with the cap adapter — a weak cap causes overheating even with no visible leak.
What you need
A complete radiator pressure & cooling-system test kit with universal cap adapters covers most cars. See our 28-piece radiator pressure tester kit and the wider automotive workshop tools.
Bottom line: a pressure test turns a frustrating leak hunt into a five-minute job. Genuine kits with warranty and cash-on-delivery at El Rayes.