Inspection and Cleaning
ON-VEHICLE INSPECTION1. INSPECT RADIATOR CAP SUB-ASSEMBLY
NOTICE:
^ If the radiator cap is contaminated, rinse it with water.
^ Before using a radiator cap tester, wet the relief valve and the pressure valve with engine coolant or water.
^ When performing following steps (a) and (b), keep the tester at an angle of over 30° above horizontal.
a. Using a radiator cap tester, slowly pump the tester and check that air is coming from the vacuum valve.
Pump speed: 1 push/3 seconds or more
NOTICE: Push the pump at a constant speed.
If air is not coming from the vacuum valve, replace the radiator cap.
b. Pump the tester and measure the relief valve opening pressure.
Pump speed: 1 push within 1 second
NOTICE: The above pump speed is for the first pump only (in order to close the vacuum valve). After the first pump, the pump speed can be reduced.
Standard opening pressure: 74 to 103 kPa (0.75 to 1.05 kgf/cm2, 10.7 to 14.9 psi)
Minimum opening pressure: 59 kPa (0.6 kgf/cm2, 8.6 psi)
If the opening pressure is less than minimum, replace the radiator cap.
HINT: Use the tester's maximum reading as the opening pressure.
ON-VEHICLE CLEANING
1. INSPECT FINS BLOCKAGE
a. If fins are clogged, wash them with water or a steam cleaner and dry with compressed air.
NOTICE:
^ If the distance between the steam cleaner and the core is too close, there is a possibility of damaging the fins, so keep the following injection distance.
^ If the fins are bent, straighten them with a screwdriver or pliers.
^ Be careful not to expose electronic components to water.