ASE A7 - Heating and Air Conditioning Technician Practice Questions

A technician finds that a vehicle's air conditioning system is blowing warm air. What should be the first step in diagnosing the issue?

• AA. Inspect the cabin air filter
• BB. Examine the condenser
• CC. Check for refrigerant leaks
• DD. Verify the condition of the compressor

The technician notices that a vehicle's AC compressor is cycling on and off rapidly. What is a likely cause?

• AA. Overcharged refrigerant
• BB. Failing blower motor
• CC. Clogged expansion valve
• DD. Insufficient refrigerant

During a service, a technician observes that the evaporator coil is ice cold and covered in frost. What does this indicate?

• AA. Blocked airflow
• BB. Proper operation
• CC. Excessive humidity
• DD. Low refrigerant levels

A technician is charged with replacing a damaged condenser. What is one of the most important steps to take before removal?

• AA. Remove the expansion valve
• BB. Disconnect the battery
• CC. Recover the refrigerant
• DD. Flush the system

While diagnosing a customer's complaint about a lack of heat, the technician activates the heater. The air comes out warm, but not as hot as expected. What is a possible cause?

• AA. Faulty thermostat
• BB. Clogged heater core
• CC. Low refrigerant
• DD. Broken radiator

After replacing a faulty expansion valve, how should a technician proceed to ensure proper operation?

• AA. Evacuate and recharge the system
• BB. Add more oil
• CC. Replace condenser
• DD. Change the compressor