Which property of water makes it to use in car radiators

The property of water that makes it a good choice for a coolant is the ability absorb heat.

For a liquid to become a coolant, there are many properties it should satisfy other than the ability to take a long time before heating up. An appropriate coolant has to be easily available or abundant and affordable, it also has to be non-toxic.  

Water meets all the above-mentioned requirements as one of the common resources on planet earth. With a neutral pH of 7, it means it is neither acidic nor alkaline making it a perfect choice for a radiator coolant. Using any acidic liquid can cause harm and reduce the life of the radiator.