DPE 5020 - Heating Ventilation & AC

Safety

• Identify and practice general shop safety rules and procedures.
• Utilizing safe procedures for handling of tools and equipment.
• Identifying and using proper placement of floor jacks and jack stands.
• Identifying and using proper procedures for safe lift operation.
• Utilizing proper ventilation procedures for working within the lab/shop area.
• Identifying marked safety areas.
• Identifying the location and the types of fire extinguishers and other fire safety equipment.
• Demonstrating knowledge of the procedures for using fire extinguishers and other fire safety equipment.
• Identifying the location and use of eye wash stations.
• Identifying the location of the posted evacuation routes.
• Complying with the required use of safety glasses, ear protection, gloves, and shoes during lab/shop activities.
• Identifying and wearing appropriate clothing for lab/shop activities.
• Securing hair and removing jewelry for lab/shop activities.
• Demonstrating awareness of the safety aspects of supplemental restraint systems (SRS), electronic brake control systems, and hybrid vehicle high voltage circuits.
• Demonstrating awareness of the safety aspects of high voltage circuits (such as high intensity discharge (HID) lamps, ignition systems, injection systems, etc.).
• Locating and demonstrating knowledge of material safety data sheets (MSDS).

Tools and Equipment

• Identify tools and their usage in automotive applications.
• Identifying standard and metric designation.
• Demonstrating safe handling and use of appropriate tools.
• Demonstrating proper cleaning, storage, and maintenance of tools and equipment.
• Demonstrating proper use of precision measuring tools Examples: micrometer, dial-indicator, dial-caliper.

HVAC Systems

• Verify the need for service or repair of HVAC systems based on unusual operating noises; determine needed action.
• Verify the need for service or repair of HVAC systems based on unusual visual, smell, and touch conditions; determine needed action.
• Identify system type and components (cycling clutch orifice tube - CCOT, expansion valve) and conduct performance test(s) on HVAC systems; determine needed action.
• Retrieve diagnostic codes; determine needed action.
• Identify causes of temperature control problems in the A/C system; determine needed action.
• Identify refrigerant and lubricant types; check for contamination; determine needed action.
• Identify A/C system problems indicated by pressure gauge and temperature readings; determine needed action.
• Identify A/C system problems indicated by visual, audible, smell, and touch procedures; determine needed action.
• Perform A/C system leak test; determine needed action.
• Recover, evacuate, and recharge A/C system using appropriate equipment.
• Identify contamination in the A/C system components; determine needed action.
• Interface with vehicle’s on-board computer; perform diagnostic procedures using recommended electronic service tool(s) (including PC based software and/or data scan tools); determine needed action.

Compressor and Clutch

• Identify A/C system problems that cause protection devices (pressure, thermal, and electronic) to interrupt system operation; determine needed action.
• Inspect, test, and replace A/C system pressure, thermal, and electronic protection devices.
• Inspect and replace A/C compressor drive belts, pulleys, and tensioners; adjust belt tension and check alignment.
• Inspect, test, adjust, service, or replace A/C compressor clutch components or assembly.
• Inspect and correct A/C compressor lubricant level (if applicable).
• Inspect, test, or replace A/C compressor.
• Inspect, repair, or replace A/C compressor mountings and hardware.

Evaporator, Condenser, and Related Components

• Correct system lubricant level when replacing the evaporator, condenser, receiver/drier or accumulator/drier, and hoses.
• Inspect A/C system hoses, lines, filters, fittings, and seals; determine needed action.
• Inspect and test A/C system condenser. Check for proper airflow and mountings; determine needed action.
• Inspect and replace receiver/drier or accumulator/drier.
• Inspect and test cab/sleeper refrigerant solenoid, expansion valve(s); check placement of thermal bulb (capillary tube); determine needed action.
• Remove and replace orifice tube.
• Inspect and test cab/sleeper evaporator core; determine needed action.
• Inspect, clean, or repair evaporator housing and water drain; inspect and service/replace evaporator air filter.
• Identify and inspect A/C system service ports (gauge connections); determine needed action.
• Identify the cause of system failures resulting in refrigerant loss from the A/C system high pressure relief device; determine needed action.

Heating and Engine Cooling Systems

• Identify causes of outlet air temperature control problems in the HVAC system; determine needed action.
• Identify window fogging problems; determine needed action.
• Perform engine cooling system tests for leaks, protection level, contamination, coolant level, coolant type, temperature, and conditioner concentration; determine needed action.
• Inspect engine cooling and heating system hoses, lines, and clamps; determine needed action.
• Inspect and test radiator, pressure cap, and coolant recovery system (surge tank); determine needed action.
• Inspect water pump; determine needed action.
• Inspect and test thermostats, by-passes, housings, and seals; determine needed repairs.
• Recover, flush, and refill with recommended coolant/additive package; bleed cooling system.
• Inspect thermostatic cooling fan system (hydraulic, pneumatic, and electronic) and fan shroud; replace as needed.
• Inspect and test heating system coolant control valve(s) and manual shut-off valves; determine needed action.
• Inspect and flush heater core; determine needed action.

Electrical Operating Systems and Related Controls

• Identify causes of HVAC electrical control system problems; determine needed action.
• Inspect and test HVAC blower motors, resistors, switches, relays, modules, wiring, and protection devices; determine needed action.
• Inspect and test A/C compressor clutch relays, modules, wiring, sensors, switches, diodes, and protection devices; determine needed action.
• Inspect and test A/C related electronic engine control systems; determine needed action.
• Inspect and test engine cooling/condenser fan motors, relays, modules, switches, sensors, wiring, and protection devices; determine needed action.
• Inspect and test electric actuator motors, relays/modules, switches, sensors, wiring, and protection devices; determine needed action.
• Inspect and test HVAC system electrical/electronic control panel assemblies; determine needed action.
• Interface with vehicle’s on-board computer; perform diagnostic procedures using recommended electronic service tool(s) (including PC based software and/or data scan tools); determine needed action.

Mechanical Operating Systems and Related Controls

• Identify causes of HVAC air and mechanical control problems; determine needed action.
• Inspect and test HVAC system air and mechanical control panel assemblies; determine needed action.
• Inspect, test, and adjust HVAC system air and mechanical control cables and linkages; determine needed action.
• Inspect and test HVAC system actuators and hoses; determine needed action.
• Inspect, test, and adjust HVAC system ducts, doors, and outlets; determine needed action.

Refrigerant Recovery, Recycling, and Handling

• Maintain and verify correct operation of certified equipment.
• Identify and recover A/C system refrigerant.
• Recycle or properly dispose of refrigerant.
• Handle, label, and store refrigerant.
• Test recycled refrigerant for non-condensable gases.