NHC MOTORS · SERVICE RECORD
2016 BMW X6 M50d Coolant Leak – Water Pump and Thermostat Replacement With a Coolant Exchange
This 2016 BMW X6 M50d came in with a coolant leak at 266,569 km. We replaced the water pump and thermostat, prepared the mating surfaces and renewed the coolant using the BG MVP machine.
Arrived 2025-11-19, 2016 BMW X6 M50d, 266,569 km, coolant leak
Inspected the water pump and thermostat area and removed the old parts
Installed a new water pump and thermostat, cleaned the mating surfaces before reassembly, exchanged the coolant with BG MVP equipment
Leak-related parts replaced; if coolant keeps dropping again in the future, have it re-inspected immediately
01 / NHC MOTORS
Why a Coolant Leak Should Not Be Left Alone
Repeated topping-up does not address a coolant leak. Insufficient coolant can lead to overheating, so the leaking area needs inspection.
On this X6 M50d, the water pump and thermostat were removed and replaced, with attention to the adjoining connections and mating surfaces.
02 / NHC MOTORS
Removing the Water Pump and Thermostat
The pump circulates coolant, while the thermostat controls its flow according to temperature. We removed the components and compared them with the replacements before assembly.
The photographs show the old parts alongside the new pump and thermostat. This stage also provides access to the surrounding hoses and connections.
03 / NHC MOTORS
Cleaning the Mating Surfaces Before Reassembly
We cleaned the mating surfaces before installing the new parts. Debris or old sealing material can leave a path for another leak.
The new water pump and thermostat were installed after the surfaces were prepared.
04 / NHC MOTORS
Coolant Exchange With BG MVP Equipment
After replacing the water pump and thermostat, we renewed the coolant using the BG MVP machine. Both the leaking components and the coolant were serviced.
05 / NHC MOTORS
Cooling System Care for a High-Mileage Car
If coolant drops again after a top-up, investigate the leak. At this mileage, the hoses and connections need attention alongside the pump and thermostat.
If a temperature warning appears while driving, stop safely and arrange an inspection. Continuing to drive an overheated engine can cause further damage.
Questions about this work
My coolant level keeps dropping a little. Can I just keep topping it up?
If it keeps dropping repeatedly, there may be a leak somewhere and the car needs to be inspected. While you keep topping up, the cause of the leak remains, and low coolant can lead to overheating.
What should I do if the coolant temperature warning comes on while driving?
Do not continue driving in that state. Pull over somewhere safe and have the car inspected. Continuing to drive while overheating can cause serious engine damage.
Related guides and work
If Your Coolant Level Keeps Dropping or You See Leak Traces on the Ground
We will locate the leak and advise which parts need replacing and which connection points should be attended to at the same time. When you contact us, it helps to have ready how often and how much coolant you have topped up, any warning light history, and recent cooling system service records.
We explain the scope of any repairs and the estimate before proceeding with your approval.
Call 031-258-1617Book on NaverBy appointment only · Gwonseon-gu, Suwon