Certified Car AC Mechanic

How It Works

  1. 1. Select Certification & Register
  2. 2. Receive a.) Online e Learning Access (LMS)    b.) Hard copy - study material
  3. 3. Take exam online anywhere, anytime
  4. 4. Get certified & Increase Employability

Test Details

  • Duration: 60 minutes
  • No. of questions: 50
  • Maximum marks: 50, Passing marks: 25 (50%).
  • There is NO negative marking in this module.
  • Online exam.

Benefits of Certification

$49.00 /-

Vskills has developed a new strategic framework for Skill Development for early school leavers and existing workers, especially in the unorganized sector to improve their employability called Trade Employable Skills (TES).

Trade Employable Skills does effective assessment and certification of candidates in different trade disciplines like Electrical, Electronics, Agriculture, Chemical, Automobile, IT, etc to make them job ready.

Why should one take this certification?

To demonstrate clear understanding and practical aspects and to get a visible recognition for this knowledge.

Table of Content


Practice Test


Companies that hire Car AC Mechanic

All small and medium companies need certified employees who have the requisite skills. There are more jobs opening up in the economy on a regular basis with the fast growth of the country.

Apply for Certification

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  • Visa Card
  • Master Card
  • American Express



  • Safety Precautions
  • Introduction
  • Air Bags (Supplementary Restraint system SRS)
  • Electrical
  • Refrigerant circuit

Various factors in Refrigeration Cycle

  • All matter can be in any 3 states
  • Methods of Refrigeration
  • Basic Refrigeration Cycle
  • Description of each phase as follows
  • Condensation
  • Expansion
  • Vaporization
  • Ton of Refrigeration
  • Example
  • Solution
  • Ambient temperature
  • Example
  • Heat of Compression

Refrigerant & Oils

  • Refrigerants
  • Refrigerants over the years
  • Identifing Refrigerants by number
  • Refrigerant-12(R-12)
  • Refrigerant-R-22
  • Refrigerant-R-134A
  • Other numbering codes
  • Refrigerant are also classified according to three levels of Toxicity & Flammability
  • Flammability
  • Other Classifications
  • Primary Refrigeratants
  • Desirable Properties of refrigerants
  • Environmental Impact of CFC & Other Refrigerants
  • Ozone Depleting Potential ( ODP)
  • R12 and R134A
  • Warning- Do not mix R12 With R134a. Make Sure you use the proper Oil
  • Purpose of A/C Refrigerant
  • Safety Rules for refrigerant
  • Importance of oil
  • Double End Capped (DEC) PAG and mineral Oils

Identification of compressor

  • Compressor
  • The function of reciprocating compressor
  • The function of swah plate compressor
  • Purpose

Identification of mechanical devices used in car air conditioning unit

  • Compressor
  • Condenser
  • Type of Condensers
  • Receiver-Drier
  • Evaporator
  • Accumulator
  • Refrigernatlines
  • A/C Blower motor
  • DUCT System

Identification of control devices of car air- conditioning cost.

  • Compressor Clutch control
  • Function of clutch coil
  • Function of dual pressure switch
  • Function of Thermo stable expression valve and orifice tube
  • Purpose- HP
  • Working
  • Orifice tubes
  • Function of thermostat
  • Thermostat control

Identification of safety devices at car air conditioning unit

  • Compressor operating controls
  • Ambient Temperature Switch
  • Thermostatic Switch
  • Low pressure cut off switch
  • High pressure relief vaive
  • Pressure Sensing (Cycling) Switch
  • Thermal limiter and superheat switch
  • Evaporator controls
  • Pilot Operated Absolute Valve (POA)
  • Valves in Receiver (VIR)
  • Evaporator Temperature Regulator Valve (ETR)
  • Cooling Fan Temperature Switch
  • High pressure fan switch
  • A/C ‘ON’ fan Switch
  • A/C fan control switch
  • Driveability Compressor Controls
  • Wide open throttle cutoff switch
  • Wide open throttle cutoff switch
  • Low vacuum switch
  • Power Brake time relay
  • Power Steering pressure cutoff switch
  • High Coolant Temperature Switch (HCTS)
  • Anti Dieseling Relay
  • Anti Dieseling relay

Function of Car Air conditioning system

  • Compressor
  • Condenser
  • Discharge line
  • Receiver driver
  • Evaporator Expansion value
  • Liquid line
  • Blower fan A
  • Suction line
  • Radiator line
  • Here’s now an air conditioning system and its component work
  • Features : Displacement (cc) 161 161 Displacement*
  • Details Product Description Specification:

Types of current

  • Types of electrical supply ( Voltage )
  • Type of current
  • AC supply
  • Alternative voltage

Identification of instruction from the data given on the dial

  • Data contained on the measuring instrument dial
  • Measuring range and measuring units
  • Types of current


  • Types of Multimeter
  • Multimeter as a DC voltmeter
  • Multimeter as a DC ammeter
  • Multimeter as an ohmmeter
  • Multimeter as a AC voltmeter
  • Method of measuring DC voltages
  • Method of measuring AC voltage
  • Method of measuring resistance
  • Method of use
  • Application of a multimeter
  • Types of multimeter

Measuring voltage and current using multimeter

  • Multi – range meter
  • Meter scale of multi – range meter
  • Multi – meter
  • Identify the scale to take reading
  • Multimeter as DC VOLMETER
  • Multimeter as DC AMMETER
  • Multi – meter as AC VOLMETER
  • Multi – meter as AC AMMETER
  • Multi – meter as OHMMETER
  • Resistance zero setting

Electrical Part of an air conditioning in car

  • The main electrical parts where as follows
  • Parts used in the system
  • Various parts are connected into the circuit
  • Electrical circuits

Inspection of the car Air conditioning system



  • Reason for Recovering Refrigerant
  • Definitions
  • Method of Recovery
  • Passive method
  • Charge migration
  • Use of System’s Compression Compressor
  • Active Method of Recovery
  • Vapor Recovery
  • Liquid Recovery

Retrofit CFC Filled car A/C with HFC

  • Retrofitting of CFC filled car a/c equipment with the HFC 134a refrigerant
  • Need to Retrofit CFC filled car a/c with HFC 134a and its advantages
  • Precaution to be taken when retrofitting CFC filled refrigerator with HFC – 134a

Evacuation of the Refrigeration System

  • Evacuation
  • Why Evacuate
  • How do we evacuate the system
  • Boiling point of water at various pressures
  • Need for a vacuum pump
  • What type of vacuum pump?
  • Construction of two stage Rotary Vacuum Pumps
  • Rotary Pumps
  • Rotary vane Pumps

Charging Refrigerant in a system

  • Refrigerant charge quantity
  • Charging by liquid or vapor
  • Vapor charging
  • Liquid charging
  • Charging Accurately
  • Refrigerant Charging
  • Charging with a charging cylinder
  • Charging by weight
  • Charging by sight glass
  • Charging refrigerant using frost line method

Performance of Auto A/C system

  • Check performance
  • How to read the graph
  • Example


  • Periodic maintenance
  • Review of Safety

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