Deck 21: Cooling System Service

Question 1

1)A plugged radiator will cause overheating at freeway speeds.

Answer 1

True

Question 2

7)While having a discussion, Technician A says that if the voltmeter reads 0.4 volt or more, the system should be flushed and refilled with new coolant to prevent corrosion of the metal parts in the system. Technician B says that the system should be flushed if the voltmeter reading is less than 0.4. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Answer 2

A

Question 3

8)All of the following statements are true EXCEPT:

A) aluminum oxide is very abrasive; it is what sand paper is made of.
B) if there is aluminum oxide in the cooling system, it looks like black sand beads.
C) when flushing a cooling system with aluminum oxide contamination, heat the engine to operating temperature and reflush the system at least three times, heating to full temperature each time.
D) using a commercial chemical cleaner, the radiator can be flushed but it must be removed from the car.

Answer 3

D

Question 4

2)Today's high-temperature engines do not require an intact fan shroud for the cooling fan to be efficient.

Question 5

17)To bleed a cooling system without an airlift, remove a heater hose at the highest place in the system while filling the ____________________.

Question 6

4)Coolant loses some of its protective ability during use and can become corrosive from contamination.

Question 7

13)Which of the following statements is LEAST-Likely true?

A) A recovery tank is a good feature to add to an older car if it does not already have one.
B) When a tank vibrates on rough roads, it can be torn from its mount.
C) If the radiator cap needs to be replaced on a recovery tank system, be sure the new cap includes a seal that works against the top of the filler neck, too.
D) One gallon of water weighs about 5 pounds.

Question 8

6)While having a discussion, Technician A says that a loose water pump drive belt can cause overheating on an older engine without a spring-loaded belt tensioner. If this happens, he states, the belt will probably squeal as it slips. Technician B say that if that is the case, the charging system light on the instrument panel will probably illuminate and the battery charge level will drop. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 9

16)Older vehicles had radiator tanks made of brass, soldered to a copper radiator core. If the fins of the core are in good condition, a restricted copper/brass radiator can be disassembled and ____________________ by a shop specializing in radiator repairs.

Question 10

14)What is the MOST-Likely material that will not corrode and that routinely replaces steel core plugs in cast iron blocks?

A) copper
B) brass
C) aluminum
D) lead

Question 11

10)All of the following statements are true EXCEPT:

A) ethylene glycol can be ignited by a flame at 100⁰F.
B) ethylene glycol is a poison.
C) be careful when handling extremely cold coolant.
D) research by General Motors has shown that an explosion can actually occur if a mist of pressurized ethylene glycol coolant mixture is sprayed on an open flame.

Question 12

12)If the engine stops with a piston down in its cylinder and the valves are closed, the engine will be ____ and the crankshaft will not be able to turn.

A) overheated
B) blocked
C) hydrolocked
D) cooled

Question 13

11)Most thermostats start to open at between ____.

A) 50⁰F and 100⁰F
B) 188⁰F and 195⁰F
C) 190⁰F and 200⁰F
D) 250⁰F and 300⁰F

Question 14

5)Radiator cleaners used to remove rust and scale are alkaline.

Question 15

9)Which of the following statements is LEAST-Likely true?

A) Ethylene glycol coolant is mixed with purified water until its concentration is correct.
B) When coolant strength has been allowed to become weak or additives are depleted, a coolant flush and change is recommended.
C) Draining off a quart of coolant and adding straight coolant can weaken a slightly weak concentration.
D) Coolant in too high a concentration can be further diluted with purified water.

Question 16

19)When there is an internal leak, coolant will flow into the cylinder during the ____________________ stroke and when the engine is off.

Question 17

15)What is the MOST-Likely temperature at which one popular hybrid system used by several manufacturers stores heated coolant for up to three days?

A) 145⁰F
B) 167⁰F
C) 176⁰F
D) 193⁰F

Question 18

3)A radiator can be damaged by a collision with the cooling fan blade if a fan clutch or water pump bearing fails.

Question 19

20)The ____________________ test provides another means of testing for leakage of exhaust gas into the cooling system.

Question 20

18)When a leak is somewhere on the engine that cannot be easily seen, use an inspection ____________________ with a flashlight.

Question 21

24)What are the steps involved in physically testing a fan clutch?

Question 22

23)What is the process involved in removing a thermostat?

Question 23

25)How does the heater core receive engine coolant?

Question 24

22)What is the process involved in testing the thermostat in the car?

Question 25

21)What items would you check on a radiator cap?