April 5, 2026: LEMON Manuals is launched! Read the announcement.

Checking Radiator Cap

WARNING: This page is about a different variant/trim than selected.

Inspect radiator cap.
NOTE: Thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.

Fig 1: Checking Valve Seat Of Radiator Cap
Courtesy of SUZUKI OF AMERICA CORP.
- Replace the cap if deposits of waxy residue or other foreign material are on the black rubber gasket or the metal retainer.
Pull the negative-pressure valve to open it and check that it closes completely when released.

Fig 2: Pulling Negative-Pressure Valve To Open It
Courtesy of SUZUKI OF AMERICA CORP.
- Check that there is no dirt or damage on the valve seat of the radiator cap negative-pressure valve.
- Make sure that the valve operates properly while opening and closing.
* Check reservoir cap relief pressure using suitable tool and Tool.

Fig 3: Checking Reservoir Cap Relief Pressure Using Tool
Courtesy of SUZUKI OF AMERICA CORP.

Tool number: EG17650301 (J-33984-A)

Standard: 98 - 118 kPa (0.99 - 1.20 kg/cm ² , 14 - 17 psi)
- When connecting the radiator cap to the tester, apply water or coolant to the cap seal surface.
- Replace radiator cap if there is an abnormality in the negative-pressure valve, or if the open-valve pressure is outside of the standard values.
Replace the radiator cap if it exceeds the specifications in the above tests.

CAUTION: When installing the radiator cap, thoroughly wipe out the radiator filler neck to remove waxy residue or foreign material.