SECTION 22: HEATING AND AIR CONDITIONING
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
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Open the evaporator compartment door.
On the HVAC module (FIGURE 11).
Disconnect circuit 90H1 from evaporator
relay R12.
Remove the evaporator motor and coil
access panel.
Identify the L.H. side discharge duct inside
compartment and remove the Phillips head
screws retaining the flexible member to duct.
Repeat step 4 for the R.H. side air duct.
Disconnect the electrical motor speed
control connections on the motor plate.
From under the vehicle, remove the eight
bolts retaining the evaporator fan motor
support. Remove the complete unit from the
evaporator compartment (Figure 32).
FIGURE 32: EVAPORATOR MOTOR ASSY FIXING
BOLTS
22315
CAUTION
Never support evaporator motor by its output
shafts while moving it.
On a work bench, unscrew the fan square
head set screws, the Phillips head screws
retaining cages to support and slide out the
assemblies from the evaporator motor
output shaft.
7.3.2 Installation
To reinstall the evaporator motor, reverse
"Evaporator Motor Removal" procedure.
FIGURE 33: EVAPORATOR MOTOR ASSEMBLY
7.4 CONDENSER
The A/C system condenser coil is hinge
mounted on the R.H. side of the vehicle on the
A/C condenser door. Since condenser’s purpose
is to dissipate heat from the hot refrigerant, it is
important to keep the cooling coils and fins
clean. A clogged coil will cause high discharge
pressure and insufficient cooling.
7.4.1 Condenser Fan Motors
Four 2-speed brushless fan motors (Figure 35),
28.5 V - (0.6 HP - 0.42 kW) are mounted on the
condenser coil and swing out with it. The fans
draw outside air through the condenser coil and
discharge it through an opening at bottom of
compartment. When temperature drops inside
condenser, the pressure in the refrigerant line
also drops. Consequently, when pressure drops
to 175 psi, the motors will run at low speed and
if the pressure continues to drop to 120 psi, a
pressure switch stops the motors so that fans do
not operate needlessly. When pressure rises to
145 psi, the pressure switch reactivates the
motors at low speed. If the pressure rises to 205
psi, the motors will switch to high speed.
