SECTION 22: HEATING AND AIR CONDITIONING
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.1 Feb 2015)
47
8.6.4 Pilot Solenoid Valve
1. No maintenance is needed unless a
malfunction occurs.
2. A pilot solenoid valve replacement seal kit is
available. See your vehicle Parts Manual for
replacement parts.
FIGURE 58: PNEUMATIC WATER VALVE
22330
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.
8.7
HOT WATER CIRCULATING PUMP
This vehicle is provided with a brushless/sealess
water circulation pump which is in the
compartment located aft of the evaporator
compartment (Figure 59). The assembly
consists of a centrifugal pump and an electric
motor which are mounted in a compact
assembly.
FIGURE 59: PUMP LOCATION
The brushless DC sealess circulating pump
requires no periodic maintenance. The sealess
design offers leak-proof protection and the
capability to resist harsh environmental
conditions. The pump magnetically couples to
the brushless DC motor without a wet seal to
wear or replace, this coupling method also
enables easy motor removal without requiring
system draining. The pump electronically
commutated brushless DC motor provides
virtually maintenance-free operation over time
by eliminating brush maintenance and
associated brush motor failure.
Inspection of the circulating pump, to determine
if the pump is working properly, should be made
while the pump is in operation.
