There are two checks you can easily do on your coolant: whether you have enough of it and if it’s still protecting your engine in cold temperatures.

Checking your car's engine coolant level regularly is important. Check out the Drive’s Garage Guide for detailed instructions to check your coolant level.

Faster is not better when it comes to engine coolant flow rate. The purpose of a radiator is to support heat transfer, which is a time-dependent process.