ASE A7 · Heating & Air Conditioning
HVAC & Engine Cooling Diagnosis/Service
The largest A7 area: HVAC performance and pressure diagnosis, leak testing, refrigerant recovery, evacuation and charging, refrigerant handling, and engine cooling and heater service.
- Questions on the A7 test
- 21
- Share of the test
- 42%
- GearheadPass questions
- 43
- With exhibits
- 11
What this area covers
ASE's task list for HVAC & Engine Cooling Diagnosis/Service on the A7 Heating & Air Conditioning test groups into these tasks. Expect diagnosis-first questions: what's the most likely cause, what should be checked next, and which technician is right.
- Performance tests and pressure readings
- Leak testing and contamination
- Recovery, evacuation and charging
- Refrigerant ID, recycling and storage
- Hybrid/EV A/C service procedures
- Engine cooling, heater core and fans
How to study it
- This area carries 21 of the A7 test's questions (42%). Give it study time in proportion.
- Work the free questions first, then read every explanation, including the ones you got right; the reasoning is what transfers to new questions.
- 1 of the 5 free questions here are Technician A/B items. Judge each statement on its own before you pick A only, B only, Both or Neither.
- 1 free question uses an exhibit. Read the exhibit's numbers before the answer options.
- Always confirm specifications in the vehicle manufacturer's service information. Test questions assume you would.
Free practice quiz
5 HVAC & Engine Cooling Diagnosis/Service questions with explanations
All 43 HVAC & Engine Cooling Diagnosis/Service questions are in the app
Plus a full-length A7 mock, flash cards, and English or Spanish on every question.
More A7 content areas
A7 · 10 questions on the test
Refrigeration System Components
Diagnosing and replacing A/C refrigeration components: compressors and clutches, protection devices, condensers, evaporators, expansion valves, orifice tubes and driers.
A7 · 19 questions on the test
Operating Systems & Related Controls
Diagnosing HVAC controls: blower and compressor clutch circuits, fan controls, electric and vacuum actuators, ducts and doors, and automatic temperature control systems.