Kia 2004.5 Spectra Service Technical Training page 229

2004.5 Spectra Technology
BLOWER MOTOR CONTROL
OPERATION
Heating, Ventilation, & Air Conditioning (HVAC)
When the ignition switch is in the ON position and the
mode switch is in any position except OFF, the blower
switch in any speed position energizes the blower
motor relay coil. The blower motor fan relay is located
next to the blower motor.
The relay provides B+ to the blower motor. Ground is
provided to the blower motor through the blower
resistor block and the blower switch. As the blower
switch is moved from LOW to HIGH (four speed
steps), resistance of the resistors (built into the blower
resistor) and therefore ground resistance will decrease,
which will increase the blower motor speed. When the
blower motor switch is in HI, all of the resistors and
resistance to ground are bypassed and the blower
motor runs at the highest speed.
19