Wait until the engine is cool, then carefully remove the expansion tank cap (A). Wet the expansion tank cap seal with engine coolant, then install it on a commercially available pressure tester (B).
2.
Apply a pressure of 112?146 kPa (1.14?1.49 kgf/cm2, 16.2?21.2 psi).
3.
Check for a drop in pressure.
4.
If the pressure drops, replace the expansion tank cap.
