5. Figure 49–1 The three major portions of the A/C and heat system are air inlet, plenum, and air distribution. The shaded portions show the paths of the four control doors. Continued
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15. Figure 49–3 A block diagram showing the inputs to the electronic control assembly and the outputs; note that some of the outputs have feedback to the ECM. See the chart on Page 567 of your textbook.
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17. Figure 49–4 A typical cabin filter being removed from behind the glove compartment. NOTE: Some cabin filters contain activated charcoal which absorbs hydrocarbons and helps to deodorize the air as it enters the interior. For best results, use the designated replacement filter.
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20. Figure 49–6 Three electric actuators can be easily seen on this demonstration unit. However, accessing these actuators in a vehicle can be difficult. Figure 49–7 The feedback circuit signals the AC control unit with the blend door position.
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22. Figure 49–8 A typical blower motor assembly with attached squirrel cage blower. A replacement motor does not include the squirrel cage blower so it needs to be switched to the replacement. Figure 49–9 A “credit card” resistor used in the rear blower assembly in a Dodge minivan.
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24. Figure 49–10 A dual climate control system showing the airflow and how it splits.
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27. Figure 49–13 A sticker on a vehicle equipped with rear heat and air-conditioning warning that a special service procedure is needed when replacing engine coolant.
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