ASE A7 study plan
ASE A7 · Give each week a clear focus.
8 weeks · About 6 hours per week
HVAC System Components, Operation, and Air Distribution
Label the major components of a typical automotive HVAC air-handling assembly (blower, evaporator, heater core, blend door, mode doors, recirculation door, case outlets) on a blank diagram
Trace the airflow path from the blower inlet to each outlet in both fresh-air and recirculation modes
Explain how blend-door position controls outlet air temperature and how mode-door position selects panel, floor, and defrost delivery
Describe the function of the blower motor, blower resistor or control module, cabin air filter, and case drains in air distribution and volume
Your checkpoint
Hand-drawn, fully labeled air-distribution diagram (all doors, actuators, and outlets) plus a 10-question self-quiz on Domain A scored at 80% or higher
Refrigeration System Components and Operation
Describe the pressure-temperature relationship of refrigerant and identify the state change (liquid/vapor) occurring at the compressor, condenser, expansion device, and evaporator
Compare orifice-tube/accumulator (CCOT) systems with TXV/receiver-drier systems, and state the function of each unique component
Explain compressor clutch engagement, cycling switches, and variable-displacement compressor control
Define superheat and subcooling and explain what each indicates about system charge and restriction
Your checkpoint
Two labeled system flow charts (one CCOT, one TXV) with a written explanation of five pressure-based symptoms and their causes
Heating, Ventilation, and Engine Cooling Systems
Trace coolant flow from the engine through the thermostat, radiator, and heater core, and explain thermostat and pressure-cap operation
Explain how heater control valves and blend doors regulate outlet temperature on cable, vacuum, and electric-servo systems
Describe operation and testing of the radiator cooling fan (mechanical clutch vs electric) and the water pump
Diagnose common no-heat and overheating complaints by listing the likely causes and the specific test used to confirm each
Your checkpoint
A table of eight heating/cooling performance complaints, each with probable cause, confirming test, and expected specification
HVAC Operating Controls, Electrical/Electronic Controls, and Automatic Climate Control
Trace a complete blower-motor circuit including fuse, relay, resistor pack or solid-state controller, switch, and grounds on a wiring diagram
Compare vacuum, cable, and electric-servo actuators and describe how to test each type in place
Explain automatic climate control inputs (in-car temperature sensor, ambient sensor, sunload sensor, evaporator temperature sensor) and how the control module commands blend, mode, and blower speed
Identify open/high-resistance feed and ground faults in an HVAC control circuit using voltage-drop logic
Your checkpoint
A completed wiring-trace worksheet for a blower circuit and actuator circuit, plus a timed 40-question mixed quiz covering Domains A through D scored at 80% or higher
Refrigerant Recovery, Recycling, Handling, and Regulatory Compliance
State the Section 609 requirements: certification before service, prohibition on intentional venting, and refrigerant identification prior to recovery
Describe the correct recovery, recycling, evacuation, and recharge sequence, and the equipment requirements for each step
Differentiate handling procedures for R-12, R-134a, and R-1234yf, including cross-contamination risks and equipment separation
Apply personal and shop safety practices: eye and skin protection, frostbite prevention, ventilation, and safe handling and storage of pressurized cylinders
Your checkpoint
A written 20-item compliance and safety checklist plus a 15-question regulatory quiz scored at 90% or higher
HVAC System Inspection, Diagnosis, Testing, and Repair
Interpret manifold gauge readings on both CCOT and TXV systems and match abnormal pressure sets to likely faults
Select and apply leak-detection methods (electronic detector, UV dye, soap solution, pressure test) appropriate to the situation
Measure vent temperature and ambient/humidity-corrected delta-T, and use a vent temperature chart to judge system performance
Work through a diagnostic flowchart that separates electrical, refrigerant-charge, and airflow faults
Your checkpoint
A 10-case diagnostic write-up including gauge readings, vent temperatures, chosen tests, root cause, and recommended repair for each case
HVAC System Components, Operation, and Air Distribution & Refrigeration System Components and Operation & Heating, Ventilation, and Engine Cooling Systems & HVAC Operating Controls, Electrical/Electronic Controls, and Automatic Climate Control & Refrigerant Recovery, Recycling, Handling, and Regulatory Compliance & HVAC System Inspection, Diagnosis, Testing, and Repair
Re-attempt every missed question from weeks 1 through 6 and record the underlying fact behind each error
Rehearse the recovery, recycling, and recharge procedure end to end on shop equipment or a trainer
Re-practice gauge interpretation and vent-temperature measurement until each step is performed without reference notes
Consolidate weak areas identified in earlier quizzes into a prioritized review list
Your checkpoint
A full 50-question mixed practice exam completed under time pressure with a score of 85% or higher, plus a written list of remaining weak areas
HVAC System Components, Operation, and Air Distribution & Refrigeration System Components and Operation & Heating, Ventilation, and Engine Cooling Systems & HVAC Operating Controls, Electrical/Electronic Controls, and Automatic Climate Control & Refrigerant Recovery, Recycling, Handling, and Regulatory Compliance & HVAC System Inspection, Diagnosis, Testing, and Repair
Drill the highest-miss topics from the week 7 weak-area list until each is explained aloud without notes
Complete two full-length timed practice exams under test-day conditions
Review all regulatory and safety points one final time, emphasizing venting prohibition, certification, and refrigerant identification
Write a one-page summary sheet from memory covering system operation, controls, diagnostics, and compliance
Your checkpoint
Two timed practice exams both scored at 85% or higher, and a one-page from-memory summary sheet covering all six domains
Milestones
Week 2: Explain the complete refrigerant cycle and the difference between CCOT and TXV systems out loud without notes, and correctly read a normal gauge set
Week 4: Score 80% or higher on the 40-question A-D mixed quiz and correctly identify every component on a blank HVAC system diagram within 15 minutes
Week 6: Score 90% or higher on the regulatory and safety quiz and correctly diagnose at least 8 of 10 written diagnostic cases
Week 8: Score 85% or higher on both timed full-length practice exams and complete the from-memory summary sheet with no more than two gaps