Component Tests: Cap
WARNING: This page is about a different car, the 2003 Mazda Tribute, 2002 Mazda Tribute, and 2001 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
- To avoid personal injury, do not unscrew the coolant pressure relief cap while engine is operating or hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly.
- Remove the pressure relief cap from the degas bottle.
- Immerse the pressure relief cap in water and install it on the shallow filler neck of Radiator/Heater Core Pressure Tester and Radiator Cap Adapter, part of Radiator/Heater Core Pressure Tester.
- Immerse the filler neck seal in water and install it in the filler neck adapter.
- Install the filler neck adapter with the filler neck seal to the Radiator Cap Adapter.
- Connect the female quick-connect fitting of the pressure test pump to the male quick-connect fitting of the filler neck adapter.NOTE:
- If the plunger of the pump is depressed too fast, an erroneous pressure reading will result.
- Slowly depress the plunger of the pressure test pump until the pressure gauge reading stops increasing and note the highest pressure reading obtained.
- Release the pressure by turning the relief screw counterclockwise. Then tighten the pressure relief screw and repeat Step 6 (at least twice) to make sure the reading is repeatable within the specifications of the pressure relief cap.
- If the pressure test gauge readings are not within specifications, install a new pressure relief cap. If the pressure test gauge readings are within specifications, carry out the Cooling System Pressure Test.