Chapter 67 - Heating and Air-Conditioning System Service - Chapter Quiz Questions

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Last updated 2:22 PM on 9/1/26
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10 Terms

1
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heater core

An evaporator is being replaced on a vehicle. It is recommended that the _________ also be replaced at the same time.

a. blower motor

b. heater core

c. radiator

d. blower resistor

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Technician A only

Two technicians are discussing replacing heater hoses. Technician A says that the replacement hoses should be the same length as the original hoses. Technician B says that the replacement hoses should be cut as short as possible to allow more coolant to flow through the heater core faster. Which technician is correct?

a. Technician A only

b. Technician B only

c. Both Technicians A and B

d. Neither Technician A nor B

3
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The refrigerant should be identified

What service procedure should be performed before recovering refrigerant from an A/C system?

a. Flush the radiator

b. The refrigerant should be identified

c. Recover all of the refrigerant oil

d. Replace the drier

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Either a or c

O-rings are usually made from ________.

a. HSN

b. natural rubber

c. neoprene

d. Either a or c

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Quick-disconnect valves

What type of service valves are used with R-134a?

a. Schrader valves

b. Gate valves

c. Quick-disconnect valves

d. Saddle valves

6
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500 microns

Which reading represents the lowest vacuum reading?

a. 27-in. Hg

b. 28-in. Hg

c. 29-in. Hg

d. 500 microns

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Air

What is a noncondensable gas?

a. Air

b. R-12

c. Ozone

d. R-134a

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Technician B only

Technician A says that all orifice tubes on all vehicles use the same orifice size. Technician B says that orifice tubes vary the orifice size by application. Which technician is correct?

a. Technician A only

b. Technician B only

c. Both Technicians A and B

d. Neither Technician A nor B

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Both a and b

Which part must be used when refitting a vehicle from R-12 to R-134a refrigerant?

a. A new (larger) condenser

b. A new service fitting and a retrofit label

c. A high-pressure cut-off switch

d. Both a and b

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Whenever the system is opened for service

When should the accumulator be replaced with a new one?

a. Whenever the system is opened for service

b. Every 5 years

c. Whenever the engine cooling system is flushed

d. It never needs changing