Chrysler PT Cruiser, Руководство по обслуживанию и ремонту, Страница: 1982 / 2078

A/C PRESSURE TRANSDUCER
DESCRIPTION
This vehicle is equipped with an a/c pressure
transducer. This transducer is screwed onto a fitting
on the liquid line between the condenser and the
high side refrigerant system service port.
OPERATION
The main function of the a/c pressure transducer is
to disengage the compressor clutch when the refrig-
erant system high pressures are too high. The PCM
senses a voltage from the transducer and converts it
to a pressure. Based on this pressure, the PCM will
disengage the clutch at 460 psi and re-engage the
clutch at 290 psi. The a/c heater control also uses the
pressure value to operate the auto-recirculation func-
tion for improved a/c performance under extreme
conditions.
DIAGNOSIS AND TESTING - A/C PRESSURE
TRANSDUCER
Before performing diagnosis of the a/c pressure
transducer switch, verify that the refrigerant system
has the correct refrigerant charge. (Refer to 24 -
HEATING & AIR CONDITIONING - DIAGNOSIS
AND TESTING)
For circuit descriptions and diagrams, (Refer to
Appropriate Wiring Information in Group 8W).
(1) Turn on engine and have a/c selected.
(2) Using the DRB-III monitor and record the
pressure value as it is sent out from the PCM.
(3) Connect the high side manifold gauge set to
the fitting on the liquid line high side refrigerant
system service port.
(4) Compare the DRB-III pressure value to the
manifold gauge set reading. The pressure reading
from the DRB-III should be similar to the reading of
the manifold gauge set value.
(5) If not, replace the a/c pressure transducer.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Unplug the wire harness connector from the
A/C pressure transducer switch, which is mounted to
a fitting on the line between the compressor and the
condenser inlet.
NOTE: On the 2.4L Turbo engine it may be neces-
sary to move or relocate the cooling module, power
steering pump or lines to gain access to the A/C
pressure transducer.
(3) Unscrew the A/C pressure transducer switch
from the discharge line fitting.
(4) Remove the A/C pressure transducer switch
from the vehicle.
(5) Remove the O-ring seal from the discharge line
fitting and discard.
INSTALLATION
(1) Lubricate a new O-ring seal with clean refrig-
erant oil and install it on the discharge line fitting.
Use only the specified O-rings as they are made of a
special material for the R-134a system. Use only
refrigerant oil of the type recommended for the com-
pressor in the vehicle.
(2) Install and tighten the A/C pressure transducer
switch on the discharge line fitting.
(3) Plug the wire harness connector into the A/C
pressure transducer switch.
NOTE: On the 2.4L Turbo Engine reposition the
cooling module, power steering pump or lines if
they were moved to gain access to the A/C pres-
sure transducer.
(4) Connect the battery negative cable.
BLOWER MOTOR RESISTOR
BLOCK
DESCRIPTION
The blower motor resistor is located in the cowl, at
the base of the windshield (Fig. 17). There are two
different resistor blocks depending on whether the
vehicle is equipped with A/C or not. The blower
motor resistors will get hot when in use. Do not
touch resistor block if the blower motor has been
running.
REMOVAL
CAUTION: Stay clear of the blower motor and resis-
tor block (Hot). Do not operate the blower motor
with the resistor block removed.
(1) Remove windshield wipers (Refer to 8 - ELEC-
TRICAL/WIPERS/WASHERS/WIPER ARMS -
REMOVAL).
(2) Remove cowl top screen (Refer to 23 - BODY/
EXTERIOR/COWL GRILLE SCREEN - REMOVAL).
(3) Disconnect the resistor block wiring connector
(Fig. 18).
(4) Remove/unsnap resistor block from vehicle.
(5) Remove the resistor block from the vehicle.
24 - 76 HEATING & AIR COND. - RHD
PT