Major Work Activity I - Services, diagnoses and repairs climate control systems
Table of Contents
- Task I-37 Services, diagnoses and repairs heating and ventilation systems
- Task I-38 Services, diagnoses and repairs air conditioning systems
Task I-37 Services, diagnoses and repairs heating and ventilation systems
Task Descriptor
Truck and transport mechanics service, diagnose and repair heating and ventilation systems for the comfort of the vehicle occupants.
I-37.01 - Services heating and ventilation systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| I-37.01.01P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| I-37.01.02P | clean components | components are cleaned according to manufacturers’ service information |
| I-37.01.03P | perform sensory inspections | sensory inspections are performed to identify worn, damaged and defective components |
| I-37.01.04P | measure air temperature and flow | air temperature and flow are measured to determine if they meet manufacturers’ service information |
| I-37.01.05P | remove and replace consumables | consumables are removed and replaced according to manufacturers’ service information |
| I-37.01.06P | recycle and dispose of consumables | consumables are recycled and disposed of according to jurisdictional regulations |
| I-37.01.07P | record service information and inspection findings | service information and inspection findings are recorded according to manufacturers’ requirements for warranty, and for future reference and tracking |
Range of Variables
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- components (to be cleaned) include: filters, heater cores, ducting
- sensory inspections include: visual check of levels, listening for motor noise and solenoid engagement, feeling air flow and temperature, smelling coolant leaks
- components include: fins, heater controls, flow valves, blowers, pumps, resistors, modules, heater cores, ducting
- consumables include: coolant, filters
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| I-37.01.01L | demonstrate knowledge of heating and ventilation systems, their components, consumables, characteristics, applications and operation | identify types of heating and ventilation systems, their components and consumables, and describe their characteristics and applications |
| describe operating principles of heating and ventilation systems, and their components | ||
| interpret information pertaining to heating and ventilation systems, and their components found in manufacturers’ service information | ||
| I-37.01.02L | demonstrate knowledge of procedures to service heating and ventilation systems, and their components and consumables | identify tools and equipment used to service heating and ventilation systems, and their components and consumables, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to heating and ventilation systems, and their components | ||
| describe procedures to inspect heating and ventilation systems, and their components and consumables | ||
| describe procedures to clean heating and ventilation system components | ||
| describe procedures to measure air flow and temperature | ||
| describe procedures to remove, replace, recycle and dispose of heating and ventilation system consumables | ||
| I-37.01.03L | demonstrate knowledge of emerging technologies and practices pertaining to heating and ventilation systems | identify emerging technologies pertaining to heating and ventilation systems |
Range of Variables
- components include: fins, heater controls, flow valves, blowers, pumps, resistors, modules, heater cores, ducting
- consumables include: coolant, filters
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- hazards include: hot surfaces, sharp edges, hot coolants
- emerging technologies include: alternative auxiliary heaters
I-37.02 - Diagnoses heating and ventilation systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| I-37.02.01P | identify symptoms of problems | symptoms of problems are identified by consulting with customer or operator |
| I-37.02.02P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| I-37.02.03P | perform sensory inspections | sensory inspections are performed to confirm complaint and establish preliminary diagnosis |
| I-37.02.04P | perform diagnostic procedures and tests | diagnostic procedure and tests are performed by following manufacturers’ service information to determine failure |
| I-37.02.05P | perform failure analysis | failure analysis is performed to determine root cause of failure |
| I-37.02.06P | record test results and inspection findings | test results and inspection findings are recorded according to manufacturers’ requirements for warranty, and for future reference and tracking |
| I-37.02.07P | interpret diagnostic results | diagnostic results are interpreted to determine next steps |
Range of Variables
- symptoms of problems include:malfunctioning heat controls, steaming windshield, coolant smell, no heat
- tools and equipment include: breakout harnesses, multimeters, thermometers, air flow gauges, vacuum cleaners, electronic service tools
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- sensory inspections include: visual check of levels, listening for motor noise and solenoid engagement, feeling air flow and temperature, smelling coolant leaks
- tests include: operational, air flow, temperature
- next steps include: repairs, component replacement or adjustment, further diagnosis
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| I-37.02.01L | demonstrate knowledge of heating and ventilation systems, their components, characteristics, applications and operation | identify types of heating and ventilation systems, and their components, and describe their characteristics and applications |
| describe operating principles of heating and ventilation systems, and their components | ||
| interpret information pertaining to heating and ventilation systems, and their components found in manufacturers’ service information | ||
| I-37.02.02L | demonstrate knowledge of procedures to diagnose heating and ventilation systems, and their components | identify tools and equipment used to diagnose heating and ventilation systems, and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to heating and ventilation systems, and their components | ||
| describe procedures to inspect heating and ventilation systems, and their components | ||
| describe procedures to diagnose and test heating and ventilation systems, and their components | ||
| describe common causes and symptoms of problems | ||
| I-37.02.03L | demonstrate knowledge of emerging technologies and practices pertaining to heating and ventilation systems | identify emerging technologies pertaining to heating and ventilation systems |
Range of Variables
- components include: fins, heater controls, flow valves, blowers, pumps, resistors, modules, heater cores, ducting
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- tools and equipment include: breakout harnesses, multimeters, thermometers, air flow gauges, vacuum cleaners, electronic service tools
- hazards include: hot surfaces, sharp edges, hot coolants
- symptoms of problems include:malfunctioning heat controls, steaming windshield, coolant smell, no heat
- emerging technologies include: alternative auxiliary heaters
I-37.03 - Repairs heating and ventilation systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| I-37.03.01P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| I-37.03.02P | remove and replace worn, damaged and faulty components | worn, damaged and faulty components are removed and replaced according to manufacturers’ service information |
| I-37.03.03P | repair components | components are repaired by changing worn, damaged and defective parts according to manufacturers’ service information |
| I-37.03.04P | clean components | components are cleaned according to manufacturers’ service information |
| I-37.03.05P | verify repairs | repairs are verified using methods |
| I-37.03.06P | document repairs and verifications performed | repairs and verifications performed are documented for warranty, liability, future reference and tracking |
Range of Variables
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- components (to be replaced) include: thermostats, blowers, flow valves, heater cores, radiators, heater boxes, actuators, filters
- components (to be repaired) include: flow valves, solenoids, auxiliary heaters
- components (to be cleaned) include: blowers, heater cores, radiators, heater boxes, filters
- methods include: road testing, sensory observations, air flow and temperature testing
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| I-37.03.01L | demonstrate knowledge of heating and ventilation systems, their components, characteristics, applications and operation | identify types of heating and ventilation systems, and their components, and describe their characteristics and applications |
| describe operating principles of heating and ventilation systems, and their components | ||
| interpret information pertaining to heating and ventilation systems, and their components found in manufacturers’ service information | ||
| I-37.03.02L | demonstrate knowledge of procedures to repair heating and ventilation systems, and their components | identify tools and equipment used to repair heating and ventilation systems, and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to heating and ventilation systems, and their components | ||
| describe procedures to remove, replace, clean and repair heating and ventilation systems, and their components | ||
| I-37.03.03L | demonstrate knowledge of practices and emerging technologies pertaining to heating and ventilation systems | identify emerging technologies pertaining to heating and ventilation systems |
Range of Variables
- components include: thermostats, blowers, flow valves, heater cores, radiators, heater boxes, actuators, filters, solenoids, auxiliary heaters
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- hazards include: hot surfaces, sharp edges, hot coolants
- emerging technologies include: alternative auxiliary heaters
Task I-38 Services, diagnoses and repairs air conditioning systems
Task Descriptor
Truck and transport mechanics service, diagnose and repair air conditioning systems for the comfort of the vehicle occupants.
I-38.01 - Services air conditioning systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| I-38.01.01P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| I-38.01.02P | clean components | components are cleaned according to manufacturers’ service information |
| I-38.01.03P | perform sensory inspections | sensory inspections are performed to identify worn, damaged and defective components |
| I-38.01.04P | measure air temperature and flow | air temperature and flow are measured to determine if they meet manufacturers’ service information |
| I-38.01.05P | remove, replace, recycle and dispose of filters | filters are removed, replaced, recycled and disposed of according to manufacturers’ service information |
| I-38.01.06P | record service information and inspection findings | service information and inspection findings are recorded according to manufacturers’ requirements for warranty, and for future reference and tracking |
Range of Variables
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- components (to be cleaned) include: condensers, evaporator cores, filters, blower motors
- sensory inspections include: performing visual check of levels, feeling air flow and temperature, listening for motor noise, checking for frost, listening for compressor engagement, looking for signs of leakage
- components include: evaporators, condensers, compressors, receiver dryers, expansion valves, orifice tubes, accumulators, sensors, controls, lines, filters, blower motors
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| I-38.01.01L | demonstrate knowledge of air conditioning systems, their components, characteristics, applications and operation | identify air conditioning systems and their components, and describe their characteristics and applications |
| describe operating principles of air conditioning systems and their components | ||
| identify types of refrigerants and describe their characteristics and applications | ||
| I-38.01.02L | demonstrate knowledge of procedures to service air conditioning systems and their components | identify tools and equipment used to service air conditioning systems and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to air conditioning systems and their components | ||
| describe procedures to inspect air conditioning systems and their components | ||
| describe procedures to clean air conditioning systems and their components | ||
| I-38.01.03L | demonstrate knowledge of training and certification requirements pertaining to air conditioning systems | identify training and certification requirements pertaining to air conditioning systems |
| I-38.01.04L | demonstrate knowledge of regulatory requirements pertaining to air conditioning systems | identify and interpret standards and regulations pertaining to air conditioning systems |
| I-38.01.05L | demonstrate knowledge of emerging technologies and practices pertaining to air conditioning systems | identify technologies that address ozone depletion and pollution, and describe their characteristics and applications |
| identify emerging technologies pertaining to air conditioning systems |
Range of Variables
- components include: evaporators, condensers, compressors, receiver dryers, expansion valves, orifice tubes, accumulators, sensors, controls, lines, filters, blower motors
- types of refrigerants include: R-12, R-134a, R-1234yf
- hazards include: high pressure, flammable, sharp edges, pinch/crush points, moving parts, corrosive materials, irritants
- training and certification requirements include: refrigerant handling training and certification
- standards and regulations include: reclaiming, recycling and disposal regulations
- emerging technologies include: auxiliary air conditioning units, refrigerant technology
I-38.02 - Diagnoses air conditioning systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| I-38.02.01P | identify symptoms of problems | symptoms of problems are identified by consulting with customer or operator |
| I-38.02.02P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| I-38.02.03P | perform sensory inspections | sensory inspections are performed to identify worn, damaged and defective components |
| I-38.02.04P | confirm complaint and establish preliminary diagnosis | complaint is confirmed and preliminary diagnosis is established |
| I-38.02.05P | perform diagnostic procedures and tests | diagnostic procedures and tests are performed by following manufacturers’ service information to determine failure |
| I-38.02.06P | compare test results to manufacturers’ service information or expected values | test results are compared to manufacturers’ service information or expected values to verify diagnosis |
| I-38.02.07P | perform failure analysis | failure analysis is performed to determine root cause of failure |
| I-38.02.08P | record test results and inspection findings | test results and inspection findings are recorded according to manufacturers’ requirements for warranty, and for future reference and tracking |
| I-38.02.09P | interpret diagnostic results | diagnostic results are interpreted to determine next steps |
Range of Variables
- symptoms of problems include: poor cooling, noises, windows fogging
- tools and equipment include: air conditioning recovery machines, pressure gauges, nitrogen, multimeters, electronic service tools, temperature and flow gauges, leak detectors
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- sensory inspections include: performing visual check of levels, feeling air flow and temperature, listening for motor noise, checking for frost, listening for compressor engagement, looking for signs of leakage
- components include: evaporators, condensers, compressors, receiver dryers, expansion valves, orifice tubes, accumulators, sensors, controls, lines, filters, blower motors
- tests include: pressure, electrical, leakage, vacuum
- next steps include: repairs, component replacement or adjustment, further diagnosis
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| I-38.02.01L | demonstrate knowledge of air conditioning systems, their components, characteristics, applications and operation | identify air conditioning systems and their components, and describe their characteristics and applications |
| describe operating principles of air conditioning systems and their components | ||
| interpret information pertaining to air conditioning systems found in manufacturers’ service information | ||
| identify types of refrigerants and describe their characteristics and applications | ||
| I-38.02.02L | demonstrate knowledge of procedures to diagnose air conditioning systems and their components | identify tools and equipment used to diagnose air conditioning systems and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to air conditioning systems and their components | ||
| describe procedures to inspect air conditioning systems and their components | ||
| describe procedures to test air conditioning systems and their components | ||
| describe procedures to diagnose air conditioning systems and their components | ||
| describe common causes and symptoms of problems | ||
| I-38.02.03L | demonstrate knowledge of training and certification requirements pertaining to air conditioning systems | identify training and certification requirements pertaining to air conditioning systems |
| I-38.02.04L | demonstrate knowledge of regulatory requirements pertaining to air conditioning systems | identify and interpret standards and regulations pertaining to air conditioning systems |
| I-38.02.05L | demonstrate knowledge of emerging technologies and practices pertaining to air conditioning systems | identify technologies that address ozone depletion and pollution, and describe their characteristics and applications |
| identify emerging technologies pertaining to air conditioning systems |
Range of Variables
- components include: evaporators, condensers, compressors, receiver dryers, expansion valves, orifice tubes, accumulators, sensors, controls, lines, filters, blower motors
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- types of refrigerants include: R-12, R-134a, R-1234yf
- tools and equipment include: air conditioning recovery machines, pressure gauges, nitrogen, multimeters, electronic service tools, temperature and flow gauges, leak detectors
- hazards include: high pressure, flammable, sharp edges, pinch/crush points, moving parts, corrosive materials, irritants
- symptoms of problems include: poor cooling, noises, windows fogging
- training and certification requirements include: refrigerant handling training and certification
- standards and regulations include: reclaiming, recycling and disposal regulations
- emerging technologies include: auxiliary air conditioning units, refrigerant technology
I-38.03 - Repairs air conditioning systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| I-38.03.01P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| I-38.03.02P | remove and replace worn, damaged and faulty components | worn, damaged and faulty components are removed and replaced |
| I-38.03.03P | adjust refrigerant pressures | refrigerant pressures are adjusted to ensure proper operation of components and equipment |
| I-38.03.04P | braze or solder lines | lines are brazed or soldered using welding equipment |
| I-38.03.05P | evacuate, clean and recharge system refrigerant | system refrigerant is evacuated, cleaned and recharged according to manufacturers’ service information |
| I-38.03.06P | recycle refrigerant | refrigerant is recycled according to jurisdictional regulations |
| I-38.03.07P | verify repair | repair is verified by running air conditioning system |
| I-38.03.08P | document repairs and verifications performed | repairs and verifications performed are documented for warranty, liability, future reference and tracking |
Range of Variables
- tools and equipment include: air conditioning recovery system, pressure and temperature gauges, vacuum pumps, refrigerant identifiers, welding equipment
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- components include: evaporators, condensers, compressors, receiver dryers, expansion valves, orifice tubes, accumulators, sensors, controls, lines, filters, blower motors
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| I-38.03.01L | demonstrate knowledge of air conditioning systems, their components, characteristics, applications and operation | identify air conditioning systems and their components, and describe their characteristics and applications |
| describe operating principles of air conditioning systems and their components | ||
| identify types of refrigerants and describe their characteristics and applications | ||
| I-38.03.02L | demonstrate knowledge of procedures to repair air conditioning systems and their components | identify tools and equipment used to repair air conditioning systems and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to air conditioning systems and their components | ||
| describe procedures to remove, replace, adjust and repair air conditioning systems and their components | ||
| I-38.03.03L | demonstrate knowledge of training and certification requirements pertaining to air conditioning systems | identify training and certification requirements pertaining to air conditioning systems |
| I-38.03.04L | demonstrate knowledge of regulatory requirements pertaining to air conditioning systems | identify and interpret standards and regulations pertaining to air conditioning systems |
| I-38.03.05L | demonstrate knowledge of emerging technologies and practices pertaining to air conditioning systems | identify technologies that address ozone depletion and pollution, and describe their characteristics and applications |
| identify emerging technologies pertaining to air conditioning systems |
Range of Variables
- components include: evaporators, condensers, compressors, receiver dryers, expansion valves, orifice tubes, accumulators, sensors, controls, lines, filters, blower motors
- types of refrigerants include: R-12, R-134a, R-1234yf
- tools and equipment include: air conditioning recovery system, pressure and temperature gauges, vacuum pumps, refrigerant identifiers, welding equipment
- hazards include: high pressure, flammable, sharp edges, pinch/crush points, moving parts, corrosive materials, irritants
- training and certification requirements include: refrigerant handling training and certification
- standards and regulations include: reclaiming, recycling and disposal regulations
- emerging technologies include: auxiliary air conditioning units, refrigerant technology