my BMW 3 Series F30/F31 (2012-2019) overheats after a long drive

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool before starting work.
• Disconnect the battery to avoid electrical issues.

2. Check and Top Up Coolant

• Inspect the coolant reservoir and radiator cap for damage.
• If needed, top off the coolant with the specified type (usually a 50/50 mix of coolant and distilled water).
• Reconnect the radiator cap securely.

3. Replace Thermostat (if faulty)

• Tools Required: Socket set, torque wrench, gasket scraper, new thermostat, gasket sealant.
• Remove the engine cover if necessary.
• Locate the thermostat housing and remove the bolts securing it (use the torque wrench).
• Gently pry off the housing and remove the old thermostat.
• Clean the mating surfaces using a gasket scraper.
• Install the new thermostat and apply gasket sealant if required.
• Reattach the thermostat housing and tighten bolts to manufacturer specifications.

4. Replace Water Pump (if faulty)

• Tools Required: Socket set, wrench set, new water pump, gasket, coolant.
• Drain the coolant from the system.
• Remove the drive belt from the water pump pulley.
• Remove the bolts securing the water pump and gently pull it out.
• Clean the mounting surface and install the new water pump with a new gasket.
• Reinstall the drive belt and fill the system with coolant.

5. Inspect and Repair Radiator Fan

• Tools Required: Multimeter, socket set.
• Check the electrical connections to the radiator fan for corrosion or damage.
• Use a multimeter to test the fan motor for continuity.
• If the fan is faulty, remove it by unscrewing the bolts and disconnecting the wiring harness.
• Install a new radiator fan and secure it with bolts.