Heating & Air Conditioning
Work Example 7

WorkKey Level: 4
NATEF Automotive Tasks: VII.C.5, VII.C.6

Use the chart below to answer the following question.  How
many quarts of antifreeze coolant are needed for a 4-gallon
system to –34^°F?                      (1 gallon = 4 quarts)

 

Cooling System Capacity in Quarts	Quarts of Antifreeze required for protection to Temperatures (°F) shown
	2	3	4	5	6	7	8	9	10	11
5	–12	–62
6	0	–-34
7	6	–17	–54
8		–7	–34	–69
9		0	–21	–-50	–70
10		4	–12	–-34	–-62
11		8	–6	–23	–47	–65
12		10	0	–15	–-34	–57
13			3	–-9	–25	–45	–-64
14			6	–-5	–18	–-34	–54	–68
15			8	0	–12	–26	–43	–-62
16			10	2	–8	–19	–34	–-52	–-64
17				5	–4	–14	–-27	–42	–58	–69
18				7	0	–10	–-21	–34	–50	–62
19				9	2	–7	–16	–28	–-42	–56
20				10	4	–3	–12	–22	–34	–48
21					6	0	–9	–17	–28	–41
22					3	2	–5	–14	–23	–-34

Solution:

Since one gallon is equal to four quarts, then four gallons equals 16 quarts. (4)(4) = 16

Reading off of the chart, 16 quarts at –34-degrees Fahrenheit requires 8 quarts of antifreeze.