Cooling & Accessory Drive Systems

Question 1

How long does a serpentine belt last?

Answer 1

100k / 4 years

Question 2

How do you measure belt tension?

Answer 2

Press belt midway by the longest span between 2 pulleys, if belt moves more then 1.25cm per 30cm, it should be adjusted

Question 3

What is a V-belt?

Answer 3

Belt only rides on the inside of the belt, and makes contact on the belt sides

Question 4

What is a V-Ribbed?

Answer 4

Belt rides and flexes both ways

Question 5

What is the operating temperature of an engine?

Answer 5

just below 100 degrees

Question 6

How much is a Rad cap typically rated for?

Answer 6

14PSI to 21PSI

Question 7

What is the purpose of a Block Heater?

Answer 7

Heats up the coolant to warm up the combustion chamber allowing the liquid fuel to vaporize easier and not flood

Question 8

How can a Voltmeter be used to check the condition of the coolant?

Answer 8

Can be checked for electrolysis. Attach negative to ground and place the positive lead into the coolant.
Readings of 0 to 0.3 volts are normal for a cast-iron engines and about half for aluminum engine

Question 9

What is the most common cause for coolant hose failure?

Answer 9

Electrochemical degradation

Question 10

If a thermostat has a locating pin, what orientation does it go?

Answer 10

Always up

Question 11

How often should IAT coolants be flushed?

Answer 11

2 years

Question 12

How often should DexCool or OAT coolants be flushed?

Answer 12

5 years

Question 13

When doing a coolant flush, how much coolant should be added to the machine?

Answer 13

First determine the vehicles coolant capacity, then determine your coolant/water mixture (i.e. 60-40). Multiple the capacity by 0.01 times the coolant percentage (i.e. 0.6)

Question 14

How much does water boiling point increase for every PSI increase?

Answer 14

1.6 degrees Celsius for every 1PSI

Question 15

When does a thermostat begin opening and when is it fully open?

Answer 15

begins opening at 1.6 degrees Celsius above/below operating temp, and is fully open 11 degrees Celsius above that

Question 16

What is the minimum percentage of coolant required in any climate?

Answer 16

44%

Question 17

What is Cavitation?

Answer 17

Erosion or pitting caused by the formation & rapid collapse of vapor bubbles formed in fast-moving or boiling coolant

Question 18

What are the 5 types of coolants?

Answer 18

Ethylene Glycol, Propylene Glycol, Phosphate-free, Organic Acid Technology (OAT) and Hybrid-OAT

Question 19

Which coolant type is least abrasive to waterpumps?

Answer 19

Hybrid Organic Acid Technology

Question 20

What coolant type is often referred to as DexCool?

Answer 20

Organic Acid Technology

Question 21

What coolant type is most poisonous and typically green in color?

Answer 21

Ethylene Glycol

Question 22

What coolant tester uses a pickup hose, reservoir and squeeze ball to test for coolants freezing point?

Answer 22

Hydrometer

Question 23

How much should pulleys be in alignment of one another?

Answer 23

1.6mm per 30cm (1ft.)

Question 24

What is the Wax in a Thermostat made up of?

Answer 24

Copper, Graphite and/or Aluminum

Question 25

What is the freezing and boiling point for a 50/50 coolant mixture?

Answer 25

Freezes at -37 degrees Celsius and boils at 107 degrees Celsius