how to diagnose a Ford F-150 13th Generation (2015-2020) that overheats in traffic?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery before starting any work on the cooling system.

2. Inspect and Replace Thermostat

• Sub-steps:
  1. Locate the thermostat housing (typically near the engine block).
  2. Remove the coolant hose connected to the housing (use a hose clamp tool if necessary).
  3. Unscrew the thermostat housing bolts using a socket wrench.
  4. Carefully lift off the housing to access the thermostat.
  5. Remove the old thermostat and replace it with a new one, ensuring the correct orientation.
  6. Reattach the thermostat housing and tighten bolts to the manufacturer’s specified torque (usually around 15-20 ft-lbs).
  7. Reconnect the coolant hose and secure the clamp.

3. Inspect and Repair Radiator Fan

• Sub-steps:
  1. Start the vehicle and allow it to reach operating temperature.
  2. Check if the radiator fan engages. If not, test the fan motor with a multimeter for continuity.
  3. If the fan is faulty, disconnect the wiring harness and remove the fan assembly.
  4. Replace the radiator fan with a new unit and reconnect the wiring.

4. Flush and Refill Cooling System

• Sub-steps:
  1. Place a drain pan under the radiator and open the drain valve to drain the old coolant.
  2. Flush the radiator with clean water (using a radiator flush product if necessary) to remove any debris.
  3. Close the drain valve and refill the system with the appropriate coolant mixture (typically a 50/50 mix of antifreeze and distilled water).
  4. Start the engine and let it run with the radiator cap off until the thermostat opens, allowing air to escape.
  5. Check coolant levels and top off if necessary.