Cooling System Pressure Test
WARNING: This page is about a different variant/trim than selected.
WARNING:
When releasing the cooling system pressure, cover the coolant expansion tank cap with a thick cloth.
NOTE:
Vehicles have a pressure relief cap on the degas bottle and no radiator cap.
- 3.
Remove the degas bottle cap. Inspect the degas bottle cap and degas bottle for any issues that would cause improper sealing, such as for cross-threading, burrs, damaged o-ring, etc. If any issues are found, INSTALL a new cap and/or degas bottle.
- 4.
Attach the Pressure Tester and adaptor (Snap-On TA53 or equivalent), to the degas bottle cap. The cap must hold the specified pressure. Refer to: Specifications . If any issues are found, INSTALL a new cap.
- 7.
Attach the Pressure Tester and adaptor (Snap-On TA52, AST ASSFZ-47, Redline RDL95-0750 or equivalent) to the degas bottle.
NOTE:
If the plunger of the pressure tester is pressed too fast, an erroneous pressure reading will result.
- 8.
To pressurize the engine cooling system, slowly press the plunger of the pressure test pump and increase the pressure to 145 kPa (21 PSI). Allow the system to stabilize for approximately 2 minutes. Re-pressurize to 21 psi. Pressure should not drop within the next 2 minutes. If the pressure drops, inspect for external leaks and repair as necessary.
NOTE:
2-4 psi of pressure drop is normal and expected after engine cool down.
- 10.
If the pressure drops more than the expected range of 2-4 psi and no external leaks are found, the leak may be internal to the engine. Using a borescope remove the spark plugs and inspect the cylinder combustion chambers for coolant intrusion. If coolant instrusion is found install a new engine long block assembly.