what causes my BMW 3 Series G20/G21 (2019-2024) engine to overheat?

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is on a level surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts or issues.

2. Coolant Level Correction

• Open the coolant reservoir cap and add the appropriate coolant mixture (BMW-approved coolant).
• Inspect the coolant hoses for any signs of wear or leaks, replacing any damaged hoses.

3. Thermostat Replacement

• Tools Required: Socket set, torque wrench.
• Remove the engine cover (if applicable).
• Locate the thermostat housing; disconnect the hoses attached to it.
• Remove the bolts securing the thermostat housing and take out the old thermostat.
• Install the new thermostat, ensuring it is oriented correctly.
• Reattach the housing, torque bolts to the manufacturer's specifications.

4. Water Pump Replacement (if faulty)

• Tools Required: Socket set, coolant drain pan.
• Drain the coolant from the radiator using the drain plug.
• Disconnect the hoses from the water pump.
• Remove the bolts securing the water pump to the engine block.
• Replace with a new water pump, ensuring the gasket is in place.
• Reattach hoses and refill the cooling system with the appropriate coolant mixture.

5. Radiator Fan Inspection

• Check the fan fuse and relay for continuity; replace if necessary.
• If the fan motor is not operational, replace the fan assembly.