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HVAC
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ii) BLOWER RESISTER
The speed of the blower can be controlled by em-
ploying either a Blower resister. The blower resister
is used in models with manual HVAC.
A blower resister used is for a four-speed control of
blower speed. This is achieved by having a combina-
tion of three different resistances. The blower
resister is placed in the intake air flow to allow it to
dissipate heat freely.
It is located on the lower side of the HVAC unit to the
right of the blower.
CIRCUIT DIAGRAM
PIN OUT
A
Medium Low Resistance
(ML)
B
Medium High Resistance
(MH)
C
High Speed
(directly engaged)
D
Low speed resistance
INSPECTION
Measure the current at the harness side connecter at
4 speeds by rotating the blower switch. The current
measurement should as per the table below.
FAN SPEED
CURRENT IN AMPS
1
st
Speed
3.5 – 5.9
2
nd
Speed
6 – 8.5
3
rd
Speed
10.5 – 13.5
4
th
Speed
14 – 25.0
The resistance can also be checked. For resistance
values refer circuit diagram of blower resistor.