Getting your coolant mix right is the key to ensuring your engine has optimal
freeze and boil protection. After taking a quick reading with your own antifreeze tester, you
can adjust your mix by using our calculator to find out the recommended amount
of coolant you need to drain and replace with antifreeze or water.
Frequently asked questions - and their answers
How do I test my antifreeze mixture?
Watch the video >
How do I adjust antifreeze concentration?
Watch the video >
The best protection takes more than having just one
refractometer as a tester. With the Chevron Cool Tools Kit,
you'll have every tool you need to ensure freeze and
boil protection is there when you need it most