Radiator Cap Test

WARNING: This page is about a different car, the 2002 Honda Accord, 2001 Honda Accord, 2000 Honda Accord, 1999 Honda Accord, and 1998 Honda Accord. However, it is still accessible from the selected car via links, so may be relevant.

Remove the radiator cap (A), wet its seal with engine coolant, then install it on the pressure tester (B) (commercially available).

Fig 1: Pressure Testing Radiator Cap
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Apply a pressure of 93-123 kPa (0.95-1.25 kgf/cm² , 14-18 psi).
Check for a drop in pressure.
If the pressure drops, replace the cap.