Coolant: Service and Repair

Antifreeze Hydrometer, Checking
Calibration of hydrometer must be checked frequently to ensure accuracy.

- mix a 50/50 mixture of antifreeze and water together in a small container

- hydrometer should read -35° C (-30° F)

- if not, put a mark (paint dot) to indicate where -35° C (-30° F) should be.