why is my BMW X3 F25 (2011-2018) losing coolant

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the engine is cool and disconnect the battery.
• Place a drain pan under the vehicle to catch any escaping coolant.

2. Inspect and Replace Leaking Components

a. Coolant Reservoir

• Remove the coolant reservoir by disconnecting the hoses and unscrewing any mounting bolts.
• Inspect for cracks; if damaged, replace with a new reservoir.
• Reconnect hoses and secure the reservoir in place.

b. Hoses

• Inspect all hoses for wear and tear. Replace any that show signs of cracking or leaks using a hose clamp tool.
• Ensure that the connections are secure after installation.

c. Radiator

• Examine the radiator for leaks. If damage is found, remove the radiator by disconnecting the hoses and mounting brackets.
• Replace with a new radiator if leaks are present. Ensure proper alignment and secure all connections.

d. Water Pump

• If the water pump is leaking, drain the coolant and remove the pump by disconnecting any belts and mounting bolts.
• Replace the water pump with a new one, ensuring to use a new gasket or sealant as recommended.
• Reattach the belts and check for proper operation.

3. Refill and Bleed the Cooling System

• Refill the cooling system with the appropriate type of coolant as specified in the owner’s manual.
• Bleed air from the system by running the engine with the radiator cap off until the thermostat opens, allowing coolant to flow freely.