my BMW 5 Series F10/F11 (2010-2017) is overheating what could be wrong

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Ensure the engine is cool before starting work.
• Disconnect the negative battery terminal for safety.
• Tools required: socket set, screwdrivers, pliers, OBD-II scanner, coolant pressure tester.

2. Coolant System Inspection

• Sub-step 1: Inspect the coolant level in the reservoir. If low, top off with the recommended coolant mixture.
• Sub-step 2: Visually inspect all hoses for cracks, bulges, or leaks. Replace any damaged hoses.
• Sub-step 3: Check the radiator for debris and clean with compressed air if necessary.

3. Thermostat Replacement

• Sub-step 1: Drain the coolant using the drain plug on the radiator.
• Sub-step 2: Remove the thermostat housing by unscrewing the bolts (torque specifications: 10 Nm).
• Sub-step 3: Replace the old thermostat with a new one, ensuring the gasket is properly seated.

4. Water Pump Inspection/Replacement

• Sub-step 1: Check the water pump for leaks around the shaft seal.
• Sub-step 2: If faulty, remove the water pump by loosening the mounting bolts (torque specifications: 10 Nm).
• Sub-step 3: Install a new water pump, ensuring all connections are secure.

5. System Refill and Bleed

• Sub-step 1: Refill the cooling system with the appropriate coolant mixture, ensuring no air pockets remain.
• Sub-step 2: Start the engine and allow it to reach operating temperature, monitoring for leaks and ensuring the thermostat opens.