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Home >> Ford >> 2002 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2985 (Engine Cooling - 6.7L Diesel Powertrain Secondary Cooling -- F250-F550 Super Duty) >> Diagnosis And Testing >> Powertrain Secondary Cooling System >> Component Tests >> Cooling System Pressure Test

Cooling System Pressure Test

WARNING: This page is about a different car, the 2011 Ford Pickup, 2011 Ford F550 Super Duty, 2011 Ford F450 Super Duty, and 2011 Ford Cab & Chassis. 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.
  1. Turn the engine OFF.
  2. Check the coolant level. Adjust the coolant level as necessary.
    Fig 1: Identifying Radiator/Heater Core Pressure Tester
    G07481681Courtesy of FORD MOTOR CO.
  3. Fit the Radiator/Heater Core Pressure Tester from the Pressure Test Kit to the degas bottle fill opening using the correct adapter.
    4. NOTE: Do not pressurize the cooling system beyond the maximum pressure listed in the Specifications  table in this service information or cooling system components can be damaged.
    NOTE: If the plunger of the pressure tester is pressed too fast, an erroneous pressure reading will result.
  4. Pressurize the cooling system to the maximum allowed pressure and hold for 2 minutes. If the pressure drops within this time, inspect for leaks and repair as necessary.
  5. If no leaks are found detach the CAC  outlet pipe from the CAC  and inspect for leaks at the bottom of the CAC  . Repair as necessary.
  6. If no leaks are found at the CAC  , the leak may be internal to the transmission fluid cooler. Check for transmission fluid in the coolant and for coolant in the transmission fluid. Repair as necessary.
  7. If no transmission fluid was found in the coolant and no coolant found in the transmission fluid, the leak may be internal to the fuel cooler. Check the coolant for fuel and the fuel in the fuel conditioning module for coolant. Repair as necessary.
  8. If no fuel is found in the coolant and no coolant is found in the fuel, the leak may be in the CAC  , but too small for coolant to be noticeable at the bottom of the CAC  . Leak test the CAC  . For additional information, refer to INTAKE AIR DISTRIBUTION SYSTEM & INTAKE AIR FILTERING SYSTEM article. Repair as necessary.
  9. If the CAC  tests OK, the leak may be internal to the EGR cooler. Leak test the EGR cooler. For additional information, refer to EMISSION CONTROL SYSTEM article. Repair as necessary.
  10. Release the system pressure and remove the Radiator/Heater Core Pressure Tester from the Pressure Test Kit. Check the coolant level and adjust as necessary.
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