Coolant needs changing because chemicals in the coolant break down and become less effective over time. This use ends up ...

The Prestone AF-1420 is a straightforward analog ... we have the ABN Deluxe Antifreeze and Coolant Tester. This is a more traditional tester that you use by drawing the fluid up using a squeeze ...

When doing this job, make sure the coolant you're using is still good. An unopened bottle of antifreeze has a shelf life of up to five years, although Prestone claims its products can stay fresh ...