2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 224Get this manual
Engine Cooling System:
Radiator Cap Inspection
Inspect the radiator cap in the following procedures: 1) Remove the radiator capRefer to "Cooling Circuit Inspection (Page 1F-4)"2) Attach the radiator cap (1) to the radiator tester (2) as shown in the figure
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Radiator cleaning 1) Remove the side covers, left and rightRefer to "Exterior Parts Removal and Installation in Section 9D (Page 9D-4)"2) Blow out any foreign matter that is stuck in the radiator fins using compressed air
CAUTION
Make sure not to bend the fins when using compressed air Always apply compressed air from the engine sideIf compressed air is applied from the front side, dirt will be forced into the pores of radiator
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3) Slowly apply pressure to the radiator capIf the radiator cap does not hold the pressure for at least 10 seconds, replace it with new oneRadiator cap release pressure 108 137 kPa (1.08 1.37 kgfcm2, 15.4 19.5 psi) 4) After finishing the radiator cap inspection, reinstall the removed parts