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ASE T7 HVAC (Medium Heavy Truck) Practice Questions - ASE T7 - Heating, Ventilation & Air Conditioning (Medium Heavy Truck) Certification Exam

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About this Exam

Prepare with the ASE T7 HVAC (Medium Heavy Truck) Practice Questions - ASE T7 - Heating, Ventilation & Air Conditioning (Medium Heavy Truck) Certification Exam practice quiz. This question bank includes 100 questions covering truck, technician, compressor, refrigerant, and says. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

Sample Questions

Question 1
A medium-duty truck A/C system cools poorly. The technician finds the discharge air at the dash vents is only 15°F below ambient and the high-side pressure is normal. Which is the BEST first diagnostic step?
Verify refrigerant charge weight with a recovery/recharge machine
Replace the A/C compressor immediately
Replace the receiver-drier and recharge
Add one can of refrigerant until vents feel colder
Question 2
Technician A says low airflow at the vents on a sleeper-cab truck can be caused by a clogged cabin air filter. Technician B says it can be caused by an evaporator iced over from a stuck-open expansion valve allowing too much refrigerant. Who is correct?
Technician A only
Both A and B
Technician B only
Neither A nor B
Question 3
During a performance test on a Class 8 truck A/C system at 1,500 rpm with doors open, the manifold gauges read 45 psi low side and 350 psi high side on R-134a with high ambient temperature. Vent temperature is high. What does this MOST likely indicate?
Compressor not engaging
Low refrigerant charge
Overcharge or restricted condenser airflow
Blend door stuck on full heat
Question 4
A truck owner reports the A/C 'works on the highway but blows warm at idle.' Which condition BEST explains this symptom?
Refrigerant overcharge only at idle
Low cabin air filter restriction
TXV stuck wide open
Inadequate condenser airflow at low engine/fan speed
Question 5
Before connecting a manifold gauge set or recovery machine to a truck A/C system, the technician must FIRST identify which refrigerant the system uses. What is the safest way to confirm whether the system is R-134a or R-1234yf?
Check the underhood refrigerant label and use a refrigerant identifier
Connect the gauges and watch the pressure
Smell the service port
Assume R-134a because the truck is older

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Additional Information

ASE T7 HVAC (Medium Heavy Truck) Practice Questions - ASE T7 - Heating, Ventilation & Air Conditioning (Medium Heavy Truck) Certification Exam

This practice set contains 100 questions from the matching question bank and focuses on truck, technician, compressor, refrigerant, and says. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Frequently Asked Questions

This quiz contains a total of 100 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.

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