GMC chevrolet camaro 2000 Service Manual page 242

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HVAC
Defrost
570797
Outside air is drawn into the vehicle, heated
(depending on the position of the temperature control
knob) and directed to the defrost outlet. A small
amount of air is routed to the floor air outlet.
Blower Motor Description
The blower motor consists of the following
components:
• A permanent magnet type motor (3)
• A squirrel cage type fan (1)
1
2
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The blower operates at various speeds. The various
speeds are determined by the resistance of the blower
motor resistor which is controlled by the blower
motor speed control.
HVAC Systems - Manual 1-145
Blower Motor Resistor Description
The following components, when used in combination,
determine the blower speed:
• The blower resistor.
• The blower switch.
The blower resistor consists of 3 resistors located in
the same housing.
With the blower switch in LO, the following
actions occur:
• The blower circuit uses all 3 resistors.
• The blower motor runs at the lowest speed.
With the blower switch in M1, the following
actions occur:
• Two of the resistors are in use.
O
The blower motor runs faster.
With the blower switch in M2, the following
actions occur:
• Only one of the resistors is in use.
• The blower motor runs even faster.
With the blower switch in HI, the following
actions occur:
• None of the resistors are in use.
• The blower motor runs at maximum speed.
Control Assembly Description (Pontiac)
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283259
The heating, ventilation and air conditioning (HVAC)
control head uses three knobs and one push button in
order to control the following features:
• The air delivery
• The air temperature
• The blower motor speed
• The rear defroster