nissan Workshop Repair Guides

Nissan and Datsun Workshop Service and Repair Manuals

Relays and Modules - Cooling System > < Cooling System - Leaks/Overheating|Page 3129
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Radiator Cap: Testing and Inspection

CHECKING RADIATOR CAP 

1. Pull the negative-pressure valve to open it and check that it closes completely when released.

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Check that there is no dirt or damage on the valve seat of the radiator cap negative-pressure valve.

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Check that there are no abnormalities in the opening and closing conditions of the negative-pressure valve.

2. Check radiator cap relief pressure.

Standard: 78 - 98 kPa (0.8 - 1.0 kg/cm2, 11 - 14 psi) 
Limit: 59 kPa (0.6 kg/cm2, 9 psi) 
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When connecting the radiator cap to the tester, apply water or coolant to the cap seal surface.

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Replace the radiator cap if there is an abnormality in the negative-pressure valve, or if the open-valve pressure is outside of the standard
values.

Relays and Modules - Cooling System > < Cooling System - Leaks/Overheating|Page 3129