nissan Workshop Repair Guides

Nissan and Datsun Workshop Service and Repair Manuals

Relays and Modules - Cooling System > < Cooling System - Leaks/Overheating|Page 3705
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Radiator Cap: Testing and Inspection

CHECKING RADIATOR CAP

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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. Pull the negative-pressure valve to
open it.

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Check that it closes completely when released.

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Check the radiator cap relief pressure specifications.
Standard:  78 - 98 kPa (0.78 - 0.98 bar, 0.8 - 1.0 kg/cm2 11 - 14 psi)
Limit:  59 - 98 kPa (0.59 - 0.98 bar, 0.6 - 1.0 kg/cm2 9 - 14 psi)

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When installing the radiator cap on 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
specifications.

Relays and Modules - Cooling System > < Cooling System - Leaks/Overheating|Page 3705