why does my Tesla Model 3 Highland (2024-present) run hot in stop-and-go traffic

Solution

1. Preparation

• Gather necessary tools and parts before starting the repair.
• Ensure the vehicle is parked on a flat surface, and the engine is turned off.
• Wear safety gloves and eyewear.

2. Coolant Check and Replacement

• Check Coolant Levels:
  • Open the front trunk and locate the coolant reservoir.
  • Inspect the coolant level; it should be between the minimum and maximum marks.
• Replace Coolant if Low:
  • If low, drain the existing coolant using a coolant drain pan.
  • Refill with manufacturer-recommended coolant type (usually a 50/50 mix of distilled water and coolant).

3. Inspect and Replace Cooling Fans

• Check Fan Operation:
  • Turn the vehicle to “On” without starting the engine.
  • Activate the cooling system and listen for fan operation.
• Replace Faulty Fans:
  • If fans do not operate, disconnect the battery (negative terminal first).
  • Remove the fan assembly: unclip wiring harness and unscrew mounting points.
  • Install new fans, reconnect the wiring, and secure mounting points.
  • Reconnect the battery.

4. Inspect and Replace Electric Coolant Pump

• Check Pump Functionality:
  • Locate the electric coolant pump (usually near the battery pack).
  • Listen for pump operation when the vehicle is turned on.
• Replace if Necessary:
  • Disconnect the battery and the pump wiring.
  • Remove the pump from its mounting bracket and disconnect the coolant hoses.
  • Install the new pump and reconnect the hoses and wiring.
  • Reconnect the battery.