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Home >> Ford >> 2021 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 (Engine Cooling - 6.8L Triton-30V - V10 -- F250-F550 Super Duty) >> Diagnosis And Testing >> Engine Cooling >> Component Tests >> Cooling System Pressure Test

Cooling System Pressure Test

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty and 2018 Ford F-450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Always allow the engine to cool before opening the cooling system. Do not unscrew the coolant pressure relief cap when the engine is operating or the cooling system is hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly. Failure to follow these instructions may result in serious personal injury.
NOTE: Vehicles have a pressure relief cap on the degas bottle and no radiator cap.
  1. Turn the engine OFF.
  2. Check the engine coolant level and adjust as necessary.
  3. Attach the Pressure Tester to the degas bottle nipple and overflow hose. Install a pressure test pump to the quick connect fitting of the test adapter.
    GFD203243Courtesy of FORD MOTOR COMPANY
  4. NOTE: Do not pressurize the cooling system beyond the maximum pressure listed in the Specifications table in this article or cooling system components may be damaged.
    NOTE: If the plunger of the pressure tester is pressed too fast, an erroneous pressure reading results.

    Slowly press the plunger of the pressure test pump until the pressure gauge reading stops increasing and note the highest pressure reading obtained. If the pressure reading exceeds the maximum cap pressure listed in the Specifications table, install a new pressure relief cap.

  5. If the system does not hold pressure, remove the pressure relief cap and wash in clean water to dislodge all the foreign material from the gasket. Check the sealing surface in the filler neck of the degas bottle for nicks or cuts. Install the pressure relief cap.
  6. Pressurize the engine cooling system as described in Step 4 above. Observe the gauge reading for approximately 2 minutes. Pressure should not drop during this time. If the pressure drops within this time, inspect for leaks and repair as necessary.
  7. If no leaks are found after a new pressure relief cap is installed, and the pressure drops, the leak may be internal to the engine. Inspect the coolant for engine oil and the engine oil for coolant. REFER to: Engine .
  8. Release the system pressure by loosening the pressure relief cap. Check the coolant level and adjust as necessary.

Thermostat 

Install a new thermostat only after at least one of the following tests and checks have been carried out:

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