Title: Check the coolant for contamination, additive package concentration, aeration, and protection level (i.e., freeze point).
Course: Diesel Equipment Technology I (20107-I) > Section: Preventive Maintenance and Inspection: Servicing the Cooling System

Checking should include

- performing a visual examination of the coolant, looking for solid particles (i.e., contaminants)
- submitting a coolant sample to a lab for analysis
- using a hydrometer or refractometer to measure the freeze protection of the coolant.

Process/Skill Questions:

- What is the purpose of the various additives found in antifreeze?
- What is the difference between standard antifreeze and extended-life antifreeze?
- What temperature will cause a 50/50 mixture of water and antifreeze to freeze?