Coolant Expansion Tank Pressure Cap Pressure Test
WARNING: This page is about a different variant/trim than selected.
WARNING:
Never, under any circumstances, remove the coolant expansion tank pressure cap while the engine is operating. To avoid having scalding hot water or steam blow out of the cooling system, use extreme care when removing the coolant expansion tank pressure cap from a hot cooling system. Wait until the engine has cooled, then wrap a thick cloth around the coolant expansion tank pressure cap and turn it slowly until the pressure begins to release, step back while the pressure is released from the system. When certain all the pressure has been released (still with a cloth) turn and remove the coolant expansion tank pressure cap. Failure to follow these instructions may result in damage to the cooling system, engine and/or cause personal injury.
- Remove the expansion tank pressure cap from the coolant expansion tank
- Use water to clean cap in area of rubber seal and vacuum relief valve. Following manufacturers instructions, install the coolant expansion tank pressure cap to the pressure testerNOTE: If the pressure tester is pressurized too quickly, an erroneous pressure reading may result.
- Slowly pressures the system until the pressure gauge reading stops increasing, and note highest pressure reading obtained
- Release pressure and repeat Step 3 at least twice to make sure the pressure test reading is repeatable and within specification
- If the pressure test gauge readings are not within specification, install a new coolant expansion tank pressure cap