Section 22: HEATING AND AIR CONDITIONING
PA1593
23
* Expansion valve not controlling properly.
Unloader Valve Stuck Open
Symptom:
* Loss of unit capacity at all temperatures.
* Higher than normal suction pressure.
* Even cylinder head temperature.
Cause:
* Unloader body stem bent.
* Foreign material binding unloader piston or
plunger.
7.2 MAGNETIC CLUTCH
Refer to Carrier service information entitled
“Housing-Mounted Electric Clutch” at the end of
this section for the description and maintenance
of the magnetic clutch.
7.3 EVAPORATOR MOTOR
The evaporator motor is installed in the
evaporator compartment (L.H. side of vehicle)
(Fig. 26). It is a 27.5 volt, 2 HP (1.5 kW) motor
which activates a double blower fan unit.
FIGURE 26: EVAPORATOR COMPARTMENT 22372
7.3.1 Removal
Set the battery master switch (master cut-
out) to the “OFF” position and trip circuit
breakers CB3.
Open the last L.H. side baggage
compartment door. Pull the black release
button located on the L.H. side in order to
unlock and open the evaporator
compartment door.
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 (Fig. 27 & 28).
FIGURE 27: 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.
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