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Radiator Cap: Testing and Inspection
Radiator Cap TestTest1. Radiator Cap - Test 1.
Wait until the engine is cool, then carefully remove the radiator cap (A). Wet the radiator cap seal with engine coolant, then install it on a commercially available pressure tester (B).
2.
Apply a pressure of 93-123 kPa (0.95-1.25 kgf/cm2, 13.5-17.8 psi).
3.
Check for a drop in pressure.
4.
If the pressure drops, replace the radiator cap.
