Radiator Expansion Tank Cap Test

1. Remove the expansion tank cap (A), wet its seal with engine coolant, then install it on the pressure tester (B) (commercially available). Use a small adapter KE-30-5 (C) (commercially available) to install the expansion tank cap.

1. Apply a pressure of 112−146 kPa (1.14−1.49 kgf/cm 2 , 16−21 psi).

1. Check for a drop in pressure.

1. If the pressure drops, replace the cap.