4-- 16© 2012 Mobile Climate Control T-299 Rev. 08/2012
NOTE
If evaporator fan motor is only functioning
in 1 or 2 of the 3 speeds, the resistor is bad,
not the fan motor.
4.16 CONDENSER FAN ASSEMBLY
Condenser fan assemblies for GEN 4 and GEN 5 are
identical in function and fit. Replace a co ndenser fan
assembly as follows:
a. Disconnect bus battery.
b. While supporting both parts, remove hardware (4
places) securing the fan guard and condenser fan
assembly to the condenser venturi.
c. Un-plug fan assembly from condenser harness.
d. Repair or replace as necessary.
e. Reassemble by reversing steps a. thru c.
f. Check condenser fan assembly operation.
4.17 REPLACING THERMOSTATIC BLOCK VALVE
The Thermostatic BlockValve isan automatic device
which regulates the flow of refrigerant into the
evaporator coil. Properly operating it will also
prevent liquid refrigerant from returning to the
compressor. If the valve is defective, it must be
replaced.
a. Disconnect bus battery.
b. Recover refrigerant from air conditioning system.
c. Pop-off the snap cap covers and remove all screws
holding the cover to the unit assembly. Remove
the evaporator cover .
d. Remove no-drip insulating tape from block valve
and fitting connections.
e. Carefully loosen fittings con n ected to the block
valve.
WARNING
There may be liquid refrigerant trapped
behind the block valve. Slowly loosen the
fitting and avoid contact with exposed skin
or eyes.
f. Remove and rep lace block valve, lubricating the
fittings with mineral oil before torquing to
required specifications (Refer to paragraph 4.10).
NOTE
Do not attempt to adjust the replacement
block valve. Valves are preset at the factory.
g. Insulate block valve with no-drip insulating tape.
h. Leak ch eck and evacuate per paragraphs 4.5 & 4.6.
i. Charge system with the recovered refrigerant.
j. Check operation of the system. Adjust refrigerant
charge as needed.
4.18 CHECKING AND REPLACING HIGH
PRESSURE SWITCH
4.18.1 Replacing High or Low Pressure Switch
a. The high and low pressure switches are
equipped with schrader valve to allow removal
and installation without pumping the unit down.
b. Disconnect wiring from defective switch.
c. Install new cuto u t switch after verifying switch
settings. (Refer to paragraph 4.18.2)
4.18.2 Checking High Pressure Switch
WARNING
Do not use a nitrogen cylinder without a
pressure regulator. Do not use oxygen in
or near a refrigeration system or as an
explosion may occur.
a. Remove switch from unit. All units are equipped
with schrader valves at the high and low pressure
switch co n n ections.
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