Milan L4-2.3L VIN Z (2006)
Radiator Cap: Testing and Inspection
Cap
WARNING: Never remove the pressure relief cap while the engine is operating or when the cooling system is hot. Failure to follow these
instructions can result in damage to the cooling system or engine or personal injury. To avoid having scalding hot coolant or steam blow out
of the degas bottle when removing the pressure relief cap, wait until the engine has cooled, then wrap a thick cloth around the pressure relief
cap and turn it slowly. Step back while the pressure is released from the cooling system. When you are sure all the pressure has been
released, turn and remove the pressure relief cap (still with a cloth).
1. Make sure the engine is cool.
2. Wrap a thick cloth around the coolant pressure relief cap on the coolant reservoir. Slowly turn the cap counterclockwise (left) until the pressure
begins to release.
3. Step back while the pressure releases.
4. When you are sure all the pressure has been released, use the cloth to turn and remove the cap.
5. 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.
6. Immerse the filler neck seal in water and install it in the filler neck adapter.
7. Install the filler neck adapter with the filler neck seal to the Radiator Cap Adapter.
8. Connect the female quick-connect fitting of the pressure test pump to the male quick-connect fitting of the filler neck adapter.
9. 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.
10. 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.
11. 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. See: Testing and Inspection/Symptom Related Diagnostic Procedures/Non-Trouble
Code Procedures
