Engine Repair Work Example 17

WorkKey Level: 4
NATEF Task(s): I.D.3., I.D.7

Problem:

1. When filling a 15-quart system with a solution that is 40% water and 60% coolant, how many quarts of coolant would be required?

2. The chart below shows the relationship between the boiling point and freezing point of ethylene glycol coolant and the percent antifreeze coolant content of the coolant. According to the following chart, if you had a 15-quart system that contained 9 quarts of antifreeze and 6 quarts water what would the boiling point of the antifreeze in the system be?

Antifreeze Boiling and Freeze Protection Chart Percent Antifreeze Freezing Point (°C) Boiling Point (°C)
49% 50% 60% 70%	–24 –37 –52 –64	126 129 132 136

Conditions: 100 kilopascals (15 psig) radiator cap in good condition

Solution:

1. 40% of 15 = (.40)(15) = 6
   6 qts water
   15 – 6 = 9 qts of coolant

2. 132°C @ 60% from chart