| A. General |
| MHT6A001 |
Research vehicle service information, including refrigerant/oil type, vehicle service history, service precautions, and technical service bulletins. |
| MHT6A002 |
Identify heating, ventilation, and air conditioning (HVAC) components and configuration. |
| MHT6A003 |
Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings. |
| MHT6A004 |
Diagnose heating and air conditioning problems; determine needed action. |
| MHT6A005a |
Identify refrigerant type; test for contamination; select and connect proper gauge set/test equipment; record temperature and pressure readings. |
| MHT6A005b |
Identify refrigerant type; test for contamination; select and connect proper gauge set/test equipment; record temperature and pressure readings. |
| MHT6A005c |
Identify refrigerant type; test for contamination; select and connect proper gauge set/test equipment; record temperature and pressure readings. |
| MHT6A006 |
Perform A/C system performance test; determine needed action. |
| MHT6A007 |
Perform A/C system leak test; determine needed action. |
| MHT6A008 |
Inspect condition of refrigerant oil removed from A/C system; determine needed action. |
| MHT6A009 |
Determine oil and oil capacity for system application and/or component replacement. |
| B. Refrigeration System Components |
| MHT6B001 |
Inspect, remove, and replace A/C compressor drive belts, pulleys, and tensioners; verify proper belt alignment. |
| MHT6B002 |
Check A/C system operation including system pressures; visually inspect A/C components for signs of leaks; check A/C monitoring system (if applicable). |
| MHT6B003 |
Inspect A/C condenser for airflow restrictions; determine needed action. |
| MHT6B004 |
Inspect, test, service, and/or replace A/C compressor and clutch assembly; check compressor clutch air gap; determine needed action. |
| MHT6B005 |
Inspect, service, and/or replace A/C system hoses, lines, fittings, O-rings, seals, and service valves. |
| MHT6B006 |
Inspect, remove, and/or replace receiver/drier or accumulator/drier. |
| MHT6B007a |
Inspect, remove, and/or replace expansion valve or orifice (expansion) tube. |
| MHT6B007b |
Inspect, remove, and/or replace expansion valve or orifice (expansion) tube. |
| MHT6B008 |
Inspect evaporator housing water drain; perform needed action. |
| MHT6B009 |
Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and/or control module) to interrupt system operation; determine needed action. |
| MHT6B010 |
Determine procedure to remove and reinstall evaporator. |
| MHT6B011 |
Determine procedure to inspect and/or replace condenser. |
| C. Heating, Ventilation, and Engine Cooling Systems |
| MHT6C001 |
Inspect engine cooling system and heater system hoses and pipes; determine needed action. |
| MHT6C002 |
Inspect HVAC system heater ducts, doors, hoses, cabin filters, and outlets; determine needed action. |
| MHT6C003 |
Identify the source of A/C system odors; determine needed action. |
| MHT6C004 |
Diagnose temperature control problems in the HVAC system; determine needed action. |
| MHT6C005 |
Determine procedure to remove, inspect, reinstall, and/or replace engine coolant and heater system components. |
| D. Operating Systems and Related Controls |
| MHT6D001 |
Verify HVAC system blower motor operation; confirm proper air distribution; confirm proper temperature control; determine needed action. |
| MHT6D002 |
Inspect and test HVAC system blower motors, resistors, switches, relays, wiring, and protection devices; determine needed action. |
| MHT6D003 |
Diagnose A/C compressor clutch control systems; determine needed action. |
| MHT6D004 |
Diagnose malfunctions in the vacuum, mechanical, and electrical components and controls of the HVAC system; determine needed action. |
| E. Refrigerant Recovery, Recycling, and Handling |
| MHT6E001 |
Understand correct use and maintenance of refrigerant handling equipment. |
| MHT6E002 |
Understand how to identify A/C system refrigerant; test for sealants; recover, evacuate, and charge A/C system; add refrigerant oil as required. |
| MHT6E003 |
Understand how to recycle, label, and store refrigerant. |