Section 22: HEATING AND AIR CONDITIONING
PA1553
50
b) Tighten the nipple in place in the body
cavity as per figure 59. Fasten pilot
solenoid vale to the pneumatic water
valve. Reconnect air supply pressure and
electrical current to the pilot solenoid
valve.
c) Check for proper operation.
o Pilot Solenoid Valve
a) No maintenance is needed unless a
malfunction occurs.
b) A pilot solenoid valve replacement seal kit
is available: 871390.
o Valve Troubleshooting
PROBLEM PROCEDURE
Valve fails to close. 1. Check electrical supply with a voltmeter. It should agree with
nameplate rating.
2. Check pressure at pilot solenoid valve inlet. It must be at least
equal to the minimum pressure stamped on the nameplate. It
should not go below minimum while valve is operating.
Valve fails to open. 1. Check that the closure member assembly, and that main actuator
and cylinder springs are free to travel.
2. Check that there is no restriction to the air escaping from the
actuator casing.
3. Make sure that pilot solenoid valve operates properly.
11.1.7 Water Recirculating Pump
This vehicle is provided with a water
recirculating pump which is located in the
evaporator compartment (Fig. 60). The water
recirculating pump consists of a centrifugal
pump and an electric motor which are mounted
on a common shaft in a compact assembly.
The (seal less) pump requires no periodic
maintenance other than replacement of motor
brushes. Replacement of motor brushes can be
performed without removing the pump
assembly. Inspection of the pump, to determine
if the pump is working properly, should be made
while the pump is in operation. If there is
evidence that the pump is not operating as per
specifications, the unit must be disassembled for
corrective measures.
Disassembly of the pump will be necessary only
in the case of a rotor failure or motor failure.
FIGURE 60: PUMP LOCATION 22178G
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