Section 22: HEATING AND AIR CONDITIONING
PA1593
7
The condenser coil mounted on the opposite
side of the evaporator is ventilated by four axial
fans. The fan motors are protected by a
manually-resettable 70 amp circuit breaker
(CB7) mounted on the rear junction panel and
accessible from the engine compartment curb-
side door.
FIGURE 8: CONDENSER COMPARTMENT 22299
Furthermore, the following relays, diodes and
multiplex module are located in the evaporator
compartment (Fig. 9). They are mounted in the
HVAC junction box located inside the evaporator
compartment door.
FIGURE 9: A/C JUNCTION BOX
A/C Junction Box
Multiplex Module
A54 I/O-B
Relays
R10 Condenser Fan Sp. 2
R12 Evaporator Fan
R20 Water Pump Relay
Diodes
D9 HVAC
D11 Pass. Liq. Sol. D17 Lugg. 5
th
Compt
D19 Lugg. 2
nd
Compt D20 Lugg. 1
st
Compt
D25 Evap. Fan D30 Water Pump
D73 Opt. D80 Opt.
4. HVAC UNIT MAINTENANCE
No special maintenance is required on the
passengers and driver's HVAC units, with the
exception of cleaning their respective coils and air
filters, plus periodic inspection for broken drains,
hoses and charging of system.
MAINTENANCE
Squeeze rubber discharge tubes located
underneath the appropriate compartment to
eliminate the accumulated water and dirt
every three months.
4.1 COIL CLEANING
Check the external surface of the coil at regular
intervals for dirt or any foreign matter.
MAINTENANCE
For the driver's HVAC unit, remove the grill
and the access panels and back flush the coil
every 12,500 miles (20 000 km) or once a year,
whichever comes first
FIGURE 10: DRIVER'S HVAC UNIT COIL ACCESS PANEL
MAINTENANCE
For the passengers’ section evaporator coil,
remove the access panel and back flush the
coil every 12,500 miles (20 000 km) or once a
year, whichever comes first
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