Radiator Cap Test

WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. 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 a commercially available pressure tester (B).

Fig 1: Installing Radiator Cap On Commercially Available Pressure Tester
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.