Q: car leaking water

asked by on

I own a BMW 750 Li, and I'm only putting water in it for coolant. My car is using up the water quickly. I have to keep adding more water all of the time. I know my car needs to have the original coolant in it, but it had a leak. Do you have ideas or suggestions? Thank you.

Hi, thanks for writing in about your BMW 750i. Water alone is not meant to handle the cooling of the engine. If only water is used in the cooling system, the water will boil off and become nothing because the engine reaches much higher temperatures than it takes water to boil.

The antifreeze that is added to the water increases the boiling point and decreases the freezing point allowing the mixture to reach much higher temperatures than water alone.

Although you have a leak, you will lose fluid much slower if you add the correct fluid to your cooling system because water alone will boil off. Even if you didn’t have a leak at all, the water would eventually run out and your engine would likely overheat.

I would recommend having your cooling system pressure tested to detect the leak, and then have the leak repaired in order to prevent any further engine damage.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. car leaking water

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Oil drained out and engine seized

If the engine will not turn over with the starter, there is a good chance that the engine has seized up due to lack of oil. I would ask for help from one of the mechanics at YourMechanic to inspect...

Q: Car is in Limp Home mode with multiple transmission codes

The codes you're getting are transmission error codes, The CAN EGS refers to a lack of communication between the electronic transmission controller and the other modules in the car. CAN is Control Area Network, the line of communication between all...

Q: Is it possible to open my radiator cap too often - to the point that doing so can damage it?

Hello, thank you for writing in. If you are not doing any damage to the cap when you remove and replace it, the cap will likely be fine. However, any time you mess with any component over and over again,...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...