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The A7 exam has 60 questions and runs 1 hours 15 minutes.
These 10 free A7 questions are organized by exam domain, so you can see how each part of the Automobile & Light Truck Certification - A7 Heating & Air Conditioning blueprint is tested. Reveal the answer and explanation under each question.
A technician is preparing to recover refrigerant from a customer's vehicle at a shop that charges for the service. Technician A says that holding ASE A7 certification satisfies the federal requirement to service motor vehicle air conditioning systems for compensation. Technician B says the applicable federal requirement is found in Section 608 of the Clean Air Act. Who is correct?
Correct answer: D - Neither A nor B
A hybrid vehicle equipped with an inverter-driven high-voltage A/C compressor requires lubricant after the compressor is replaced. Which lubricant must be used, and why?
Correct answer: C - POE (ester) oil, because PAG is electrically conductive and can damage the motor windings
An R-134a TXV system is performance tested at 90°F ambient with the engine at 1,500 RPM and the blower on high. The low side reads 55 psi, the high side reads 145 psi, and the suction line is frosted back to the compressor. Center vent temperature is 62°F. Which is the MOST likely cause?
Correct answer: B - An expansion valve stuck open and overfeeding the evaporator
An A/C system has been repaired and evacuated. It holds a deep vacuum for 30 minutes with no measurable rise. Technician A says this confirms the system is leak-free and ready to charge. Technician B says a system can hold a vacuum and still leak under high-side operating pressure. Who is correct?
Correct answer: B - B only
A vehicle returns three days after a coolant replacement with an intermittent no-heat complaint and a temperature gauge that fluctuates. The reservoir level is correct and no external leaks are found. What was MOST likely done incorrectly during the service?
Correct answer: D - The cooling system was not properly bled of trapped air
Refrigerant recovered from a customer's vehicle registers 91% R-134a purity on an SAE J2912 identifier. What is the correct disposition of this refrigerant?
Correct answer: A - Recover it with contaminated-refrigerant equipment and send it for reclamation
A technician is leak testing an R-1234yf system after a repair. All of the following are acceptable practices EXCEPT:
Correct answer: C - Pressurizing the system with compressed air from the shop air supply
A customer reports that airflow from the vents has been weak for several weeks and that cooling became poor only recently. At 85°F ambient with the blower on high, the low side reads 12 psi, the high side reads 165 psi, and the evaporator is found to be iced. Which is the MOST likely root cause?
Correct answer: B - A severely restricted cabin air filter
A vehicle with an externally controlled variable displacement compressor is being diagnosed for poor cooling. The compressor runs continuously and never cycles off. Technician A says the clutch cycling switch is faulty and should be replaced. Technician B says continuous operation without cycling is normal for this compressor design. Who is correct?
Correct answer: B - B only
A compressor has failed internally and metal debris is found in the discharge line. The vehicle uses a parallel-flow (microchannel) condenser. Which action is required?
Correct answer: D - Replace the condenser, because parallel-flow designs cannot be reliably flushed
The A7 exam also covers these domains. Drill them in the full free practice test:
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