Air doors are controlled by all of the following methods EXCEPT:

With the use of , maintaining vaporization and condensing points at normal ambient temperatures is simply done by raising or reducing the pressure of the refrigerant.

Before charging the air-conditioning system, be sure to have a minimum of _____ (2.3 kg) plus your charge amount in the air-conditioning machine.

The ECU sends output commands to which type of component to control fan speed, heater core coolant flow, and air-conditioning clutch activation?

In a system equipped with a rear climate control panel, with the rear air control panel selected on the front panel, the rear passengers can typically select ______.

The purpose of the air conditioner compressor is to:

______ sniffers are supersensitive microphones that can pick up the hiss of a leak that is too small to be heard by human ears.

Most automatic temperature control doors are typically operated by which of the following methods?

Technician A says that conduction is when heat transfers through solids. Technician B says that radiation is when heat travels through space. Who is correct?

Charging a system is performed only after the air-conditioning system has been evacuated and:

A(n) HVAC system uses an ECU to determine when to run the compressor and the amount of heat required to match and maintain the desired temperature selected by the operator.

______ made it possible for air-conditioning systems to be used by consumers with no apparent harm, unlike the ammonia systems.

______ is the term used to describe the process of making the system perform to its maximum ability and comparing that to specifications.

If the climate control system that is being worked on has a(n)____ panel, there will be a rotary or linear switch for fan speed, a rotary or linear switch for modes (floor, defrost, vent, or vent and floor), and a rotary or linear switch for temperature.

The air box typically contains two doors to control temperature and function. They are known as the blend door and the door.

If the velocity of the liquid rises, the pressure of the liquid must drop according to the _____ principle.

In the automotive refrigerant system, low-pressure liquid leaves the metering device and travels into the in the passenger compartment.

The first step in the diagnostic process of the HVAC system is .

Technician A says that when troubleshooting an automatic temperature-controlled air-conditioning or heating problem, one of the first steps should be to check codes for any related faults. Technician B says that codes should only be consulted if you get stuck during diagnosis. Who is correct?

The first use of air heated from to warm the passenger compartment dates from the late 1920s.

Technician A states that using UV light and refrigerant dye is a common way to test for leaks in an air-conditioning system. Technician B states that some vehicle manufacturers add dye during the manufacturing process. Who is correct?

Technician A states that failure to change vacuum pump oil will result in increased pump wear. Technician B states that increased pump wear causes the pump to not be able to draw as deep of a vacuum. Who is correct?

Technician A states that the fully automatic system control panel typically has an auto mode that takes care of the entire system. Technician B states that the control panel usually has a digital display to show the temperature selected. Who is correct?

The automotive air-conditioning cycle starts with the ______.

The _______ acts as a low-pressure safety switch for the air-conditioning system.

Which of the following sub-systems does an automatic climate system NOT control?

Types of electronic sniffers include all of the following EXCEPT:

During an air-conditioning system performance test, what should the engine rpm be raised to?

If the oil removed during the air-conditioning system reclaiming process was more than _______, the air-conditioning system needs to be flushed, and a base charge of oil needs to be established.

Heat always travels:

Removing refrigerant from a system is known as reclaiming or:

Vacuum pump oil is one of the regular maintenance items that you will be prompted to change after approximately each ______ of vacuum use.

If the diagnosis of a faulty HVAC system determines that a component of the air-conditioning system is not working properly, such as a faulty cycle switch, then _______ is not needed.

Starting at the compressor, a low-pressure gas is compressed into a high-pressure gas and is pumped into the _______ located in the front of the vehicle radiator.

Technician A says that the manual-type HVAC system is the most basic type of system. Technician B says that a scan tool should be used to diagnose a manual-type HVAC system. Who is correct?

Identify the component of an R-1234yf machine that is one of the regular maintenance items that you will be prompted to change after processing 331 lbs (150.1 kg) of refrigerant?.

One of the first steps in checking the operation of an automatic or semiautomatic HVAC system is to research the system’s operation in the ________, which will give you a good idea of how to perform a thorough testing.

Which of the following types of testing requires an empty air-conditioning system?

What is the minimum amount of time an air-conditioning system should be evacuated for to effectively boil all the water out of the system?

Technician A says that the evaporator is on the high side of the system. Technician B says that the condenser transfers heat to the atmosphere. Who is correct?

Automotive air-conditioning is federally regulated by ________.

Which of the following is NOT a possible cause if a manually controlled air conditioner or heater is not delivering the proper temperature of air?

In the automotive air-conditioning system, the transformation from liquid to gas begins when the air from the passenger compartment passes over the ______ coils and fins.

Which of the following statements is NOT true regarding a recovery machine?

A performance test typically consists of turning on the air conditioner to its maximum setting with the windows closed and raising the engine rpm to _______.

Leak testing can be done by any of the following methods EXCEPT:

Electric actuators have small plastic gears inside that can strip out if the mode doors get jammed or develop excessive ________ when turning.

At what mileage increment should in-cabin air filters usually be replaced?

A manual-type HVAC system requires the operator to fully control all of the following EXCEPT: