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SERIES 50 FAULTY PRESSURE CONTROL CAP

To determine if a faulty pressure control cap is causing high engine coolant temperature, perform the following: ‪

  1. Perform coolant pressure control cap tests; refer to Section .
    1. If the cooling system pressure is less than or equal to 48.3 kPa (7 lb/in.2 ), check the coolant hoses; refer to Section .
    2. If the cooling system pressure is greater than 48.3 kPa (7 lb/in.2 ), refer to Section .

Pressure Control Cap Resolution

Perform the following steps to resolve faulty pressure control cap: ‪

  1. Remove and replace pressure control cap; refer to Section .
  2. Install a new pressure control cap; refer to Section .
  3. Verify pressure control repair; refer to Section .
Test Engine with Replaced Pressure Control Cap

Perform the following to determine if exterior radiator repair resolved high engine coolant temperature: ‪

  1. Start and run the engine.
  2. Run the engine through its operating range with no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range.
    1. If the engine coolant temperature is normal, no further troubleshooting is required. Shut the engine down.
    2. If the engine coolant temperature is not normal, shut the engine down. Check coolant hoses; refer to Section .