Checking Radiator Cap
WARNING:
- Do not remove the radiator cap or reservoir tank cap when the engine is hot. Serious burns could occur from high-pressure engine coolant escaping from the cooling system.
- When removing the radiator cap or reservoir tank cap, wrap a thick cloth around the cap and slowly turn it a quarter turn to allow built-up pressure to escape. Then carefully remove the cap by turning it all the way.
- Check the pressure valve of the radiator cap.
- Replace the radiator cap if the metal plunger (B) on the pressure valve cannot be seen around the edge of the rubber gasket (A).
- Replace the radiator cap if there is damage or deposits of foreign material on the rubber gasket or pressure valve.CAUTION: Thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.
- Check the negative-pressure valve of the radiator cap.
- Replace the radiator cap if the negative-pressure valve does not close completely when pulled open and released.
- Replace the radiator cap if there is damage or deposits of foreign material on the valve seat of the negative-pressure valve.
- Replace the radiator cap if there is an abnormality in the operation of the negative-pressure valve.
- Check radiator cap relief pressure.
- Check the radiator cap relief pressure using Tools (A) and (B), and suitable tool (C).
Tool number (A)
:--(J-51771-5)
Tool number (B)
:--(J-51771-9)
Tool number (C)
(commercially available)
:--(J-33984-A or equivalent)
Radiator cap relief
pressure
: Refer to Radiator .
- When connecting the radiator cap to suitable tool (C), apply water or coolant to the radiator cap seal surface.
- Replace the radiator cap if the radiator cap relief pressure is outside of specification.
- Check the radiator cap relief pressure using Tools (A) and (B), and suitable tool (C).