Heating & Air Conditioning
Work Example 5

WorkKey Level: 4
NATEF Automotive Tasks: VII.C.5

You have 12 quarts of antifreeze in a 20-quart system.
   1. What would the boiling point be?
   2. What would the freezing point be?

Freeze/Boil Protection Chart
* Using a 15-PSI Pressure Cap

% of Cooling System Capacity	Protects from Freezing Down to	Protects from Boiling Up to*
50	–34° F	265° F
60	–62° F	270° F
70	–-84° F	276° F

 

 

 

Solution:

12 quarts of antifreeze/20-quart system = 12/20 = 3/5 = 60%.

1. Reading off of the chart:
   60% of Cooling System Capacity has a boiling point up to 270 degrees Fahrenheit.
2. Reading off the chart:
   60% of Cooling System Capacity has a freezing point down to –62 degrees Fahrenheit.