Servicing A.C. pretest

If an odor in the air-conditioning system is in all positions, the problem is likely in the __________.

• evaporator

• cooling system
• heating system
• engine system

Which of the following is NOT a method of leak testing?

• Pressurizing the A/C system with nitrogen

• Fluorescent dye and an ultraviolet lamp

• –Electronic leak detectors

• oxygenated purge

If the compressor fails internally, it may make what type of noise?

• hissing or whistling
• squeaking or chirping
• rumbling or vibrating
• grinding or knocking

The type of refrigerant must remain the same because cross-contamination will create a(n) __________.

• no impact on efficiency, system performance, or safety
• reduced efficiency, damage to the system, and potential safety hazards
• increased efficiency, improved system performance, and enhanced safety
• reduced efficiency, improved system performance, and enhanced safety

 When cleaning a condenser, shop air or a water hose may be used to remove the debris, but be careful to not fold over the __________.

• fins
• coil
• pipes
• fan

Technician A says the cabin air filter should be inspected during every service and replaced only according to the manufacturer's specified interval. Technician B says the filter should be checked for any cracks, tears, or deformities that would cause it to be ineffective. Who is correct?

• Technician A
• Neither technician
• Technician B
• Both technicians

Technician A says O-rings in the fittings must be replaced only if they show signs of wear or damage. Technician B says the removal of hoses and lines is done for replacement purposes or to access another component. Who is correct?

• Technician A
• Technician B
• Neither
• Both

Which of the following are rated in the total volume of air that can be removed every minute?

• Vacuum gauges

• Humidifiers
• Heating systems
• Air conditioners

To remove moisture from the air-conditioning system, the pressure in the lines needs to be lowered with a(n) __________.

• fan
• dehumidifier
• compressor
• vacuum pump

After adding the correct amount of refrigerant to the system, a good practice is to rotate the __________ by hand to push out any liquid that may have entered during the charging process.

• condenser
• compressor
• evaporator
• thermostat