FixVault
Home › Ford › 2023 › F-150 Lightning Pro › Repair and Diagnosis › Hybrid/Electric Powertrain › Cooling Systems › Electrified Drivetrain Cooling › General Procedures › Cooling System Pressure Test › Check

Cooling System Pressure Test: Check

NOTE: Vehicles have a pressure relief cap on the coolant expansion tank and no radiator cap.
  1. Turn the vehicle OFF.
  2. Detach the retainers and remove the LH cover.
    GFD729291Courtesy of FORD MOTOR COMPANY
  3. Check the coolant level in coolant expansion tank and adjust as necessary.
  4. Remove the coolant expansion tank cap. Inspect the coolant expansion tank cap and coolant expansion tank for any issues that would cause improper sealing, such as for cross-threading, burrs, damaged o-ring, etc. If any issues are found, or if coolant was expelled through the cap potentially leaving contamination in the gasket, INSTALL a new cap and/or coolant expansion tank.
  5. Attach the Pressure Tester and adaptor (Snap-On TA53 or equivalent), to the coolant expansion tank cap. The cap must hold pressure of 145 kPa +/- 21 kPa (21 PSI +/- 3 PSI). If any issues are found, INSTALL a new cap.
  6. Attach the Pressure Tester and adaptor (Snap-On TA52, AST ASSFZ-47, Redline RDL95-0750 or equivalent) to the coolant expansion tank.
    GFD729292Courtesy of FORD MOTOR COMPANY
  7. NOTE: Do not pressurize the cooling system beyond the maximum pressure or cooling system components may be damaged.
    NOTE: If the plunger of the pressure tester is pressed too fast, an erroneous pressure reading results.

    To pressurize the cooling system, slowly press the plunger of the pressure test pump and increase the pressure to between 124 - 138 kPa (18 - 20 PSI). 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.

  8. If no leaks are found and the pressure drops, the leak may be internal to the front electric drive assembly or the rear electric drive assembly or the high voltage battery or the battery chiller or cabin coolant heater or heater core. REFER to ELECTRIFIED DRIVETRAIN DIAGNOSIS AND TESTING , ELECTRIFIED DRIVETRAIN COOLING DIAGNOSIS AND TESTING , HIGH VOLTAGE BATTERY, MOUNTING AND CABLES DIAGNOSIS AND TESTING , or CLIMATE CONTROL SYSTEM DIAGNOSIS AND TESTING to diagnose performance concerns.
  9. If the pressure does not drop, remove the cooling system Pressure Tester and adaptor from coolant expansion tank.
  10. Install the coolant expansion tank cap until it contacts the hard stop.
  11. Install the LH cover.
GFD729291Courtesy of FORD MOTOR COMPANY
About FixVault