1 Copyright © 2007 General Motors Corporation. All Rights Reserved.

2 HVAC System and Operations D D2 Welcome to

3 The material contained in this course component was accurate and current at the time of course development

4 Web Site

5 Question 1 In which of the following regions is your dealership located? A.Atlanta B.Chicago C.Dallas D.Los Angeles E.New York A.Atlanta B.Chicago C.Dallas D.Los Angeles E.New York

6 Upon successful completion of this course, you will be able to diagnose and repair HVAC system concerns. Course Goal

7  HVAC, Stage 1 WBT ( W1)  HVAC, Stage 2 WBT ( W2)  HVAC, Stage 1 WBT ( W1)  HVAC, Stage 2 WBT ( W2) Recommended Prerequisites

8  Identify engine coolant and ventilation system  Identify proper methods to diagnose an electrical concern on an A/C system  Identify engine coolant and ventilation system  Identify proper methods to diagnose an electrical concern on an A/C system Session Objectives

9  Identify the components and operation of the engine cooling system  Identify the internal components and operation of the HVAC housing  Identify heating and ventilation flow  Identify the components and operation of the engine cooling system  Identify the internal components and operation of the HVAC housing  Identify heating and ventilation flow Module 4 Objectives

10  Radiator  Water pump  Thermostat  Heater core  Radiator  Water pump  Thermostat  Heater core Engine Cooling Components

11  Coolant surge tank  Coolant  Cooling fans  Coolant surge tank  Coolant  Cooling fans Engine Cooling Components cont.

12 RadiatorsRadiators

13 Fin Straightening Tool

14 Water Pump

15 ThermostatThermostat

16 Heater Core

17 Coolant Surge Tank

18 DEX-COOL ® Coolant

19 Cooling Fans

20 Does anyone have any concerns or unique problems that they have run into concerning the heating and ventilation on GM vehicles? Question

21 Film Valve

22 Cable Controlled Systems  Connected from control head  Usually adjustable  Consult SI for adjustment procedures  Connected from control head  Usually adjustable  Consult SI for adjustment procedures

23 Vacuum Actuators  Used to direct vacuum to actuator  Used on some vehicles  Used to direct vacuum to actuator  Used on some vehicles

24 Two Wire Actuator

25 Three Wire Actuator

26 Five Wire Actuator

27 Tech Tip Never attempt to operate an actuator once removed from the HVAC housing. If you do, the internal actuator gears will go beyond their designed travel limit. This will render the actuator inoperative. Never attempt to operate an actuator once removed from the HVAC housing. If you do, the internal actuator gears will go beyond their designed travel limit. This will render the actuator inoperative.

28 Automatic Climate Control

29 Dual Zone Climate Control

30 Rear Zone Climate Control

31  Identified the components and operation of the engine cooling system  Identified the internal components and operation of the HVAC housing  Identified heating and ventilation flow  Identified the components and operation of the engine cooling system  Identified the internal components and operation of the HVAC housing  Identified heating and ventilation flow Module 4 Summary

32 Posttest Question 1 All of the following are components of the engine cooling system EXCEPT __________. A.radiator B.condenser C.thermostat D.heater core A.radiator B.condenser C.thermostat D.heater core

33 Posttest Question 2 Coolant provides lubrication for which of the following? A.Water pump B.Cooling fans C.Cooling surge tank D.Heater core A.Water pump B.Cooling fans C.Cooling surge tank D.Heater core

34 Posttest Question 3 Placing the thermostat on the radiator outlet hose or the ________ will allow for more precise temperature control of coolant. A.upper intake B.water pump inlet C.radiator D.cylinder head A.upper intake B.water pump inlet C.radiator D.cylinder head

35 Posttest Question 4 The water pump is designed to circulate coolant through all of the following components EXCEPT the ____________. A.heater core B.engine C.radiator D.evaporator A.heater core B.engine C.radiator D.evaporator

36 Posttest Question 5 At what temperature does coolant begin to flow through the radiator on MOST vehicles? A.66°C (150°F) B.38°C (100°F) C.121°C (250°F) D.88°C (190°F) A.66°C (150°F) B.38°C (100°F) C.121°C (250°F) D.88°C (190°F)

37  Identify proper methods to diagnose an electrical concern on an A/C system Module 5 Objective

38  Class 2  GM Local Area Network (LAN)  Local Interconnect Network (LIN)  Class 2  GM Local Area Network (LAN)  Local Interconnect Network (LIN) Communication Network Overview

39  A/C pressure transducer  High and low pressure switches  Evaporator temperature sensors  A/C pressure transducer  High and low pressure switches  Evaporator temperature sensors System Sensors

40  Ambient air temperature sensor  Inside air temperature sensor  Outlet air temperature sensor  Sunload sensor  Ambient air temperature sensor  Inside air temperature sensor  Outlet air temperature sensor  Sunload sensor Additional System Sensors

41 Ambient Air Temperature Sensor A B C D General Overview

42 Ambient Air Temperature Sensor

43 Inside Air Temperature Sensor

44 Outlet Air Temperature Sensor

45 Sunload Sensor

46 Vehicle:2007 Cadillac CTS Concern:Insufficient cooling – vehicle is too warm Vehicle:2007 Cadillac CTS Concern:Insufficient cooling – vehicle is too warm Diagnostic Scenario #2

47  A/C compressor is not coming ON  Cooling fans are working  ACR2000 was installed  System appears to be charged  No visible damage to A/C or electrical components  A/C compressor is not coming ON  Cooling fans are working  ACR2000 was installed  System appears to be charged  No visible damage to A/C or electrical components Quick Checks

48 Why do you feel Step 4 is important? Question

49 Which tools should be used to properly perform Step 4? Question

50  Identified proper methods to diagnose an electrical concern on an A/C system Module 5 Summary

51 Posttest Question 6 The ambient air temperature sensor may also be referred to as the inside air temperature sensor. TrueFalseTrueFalse

52 Posttest Question 7 The ambient temperature sensor is used during automatic temperature control operation to vary the _________. A.engine fan speed B.inlet air temperature C.engine temperature D.outlet duct temperature A.engine fan speed B.inlet air temperature C.engine temperature D.outlet duct temperature

53 Posttest Question 8 A voltage below.2 volts on the pressure sensor will indicate high refrigerant levels TrueFalseTrueFalse

54 Posttest Question 9 Which of the following sensors uses a photoconductive diode to provide a controller with information? A.Inside air temperature sensor B.Ambient air temperature sensor C.Outlet air temperature sensor D.Sunload sensor A.Inside air temperature sensor B.Ambient air temperature sensor C.Outlet air temperature sensor D.Sunload sensor

55 Posttest Question 10 According to SBD, which of the following steps specifically requires testing of power and ground? A.Preliminary checks B.Published diagnostic system checks C.Repair and verify fix D.Verify customer concern A.Preliminary checks B.Published diagnostic system checks C.Repair and verify fix D.Verify customer concern

56 To Obtain Posttest Results After 5 Business Days go to:   Select “Training Records” from menu  Select “View Your Training Records” After 5 Business Days go to:   Select “Training Records” from menu  Select “View Your Training Records”

57 Session Summary  Identify engine coolant and ventilation system  Identify proper methods to diagnose an electrical concern on an A/C system  Identify engine coolant and ventilation system  Identify proper methods to diagnose an electrical concern on an A/C system

58  Turn to evaluation module; remove and complete evaluation  Use keypad to answer questions  Turn to evaluation module; remove and complete evaluation  Use keypad to answer questions  Press the “Next Quest” key after each question  Press “Yes” when completed  Press the “Next Quest” key after each question  Press “Yes” when completed Evaluation Instructions

59 Evaluation Instructions cont.  Fill out back of the evaluation form  Include today’s date, time and time zone  Fax to the Detroit IDL Center at (586)  Fill out back of the evaluation form  Include today’s date, time and time zone  Fax to the Detroit IDL Center at (586)

60 HVAC System and Operations D D2 Thank you for attending

61 Copyright © 2007 General Motors Corporation. All Rights Reserved.