Chrysler PT Cruiser Service & Repair Manual page 1914

24 - 8 HEATING & AIR COND. - LHD
HEATING & AIR COND. - LHD (Continued)
Fig. 4 A/C Compressor Removal/Installation 2.4L
1 - Power Steering Fluid Tank
2 - A/C Discharge Line
3 - High Pressure Cutoff Switch Electrical Connector
4 - Discharge Line Connection Bolt
5 - A/C Compressor Mounting Bolts (4 total)
6 - A/C Compressor
7 - High Pressure Cutoff Switch / High Side Charging Port
NOTE: Please refer to the underhood HVAC Specifi-
cation sticker for the latest refrigerant fill levels for
the vehicle being worked on.
NOTE: On vehicles equipped with the 2.4L Turbo
removal of the High Side Pressure Switch may be
required depending on your HVAC Charging Equip-
ment. Check your service equipment manual to see
if low side only servicing is permitted if not then
removal of the switch is required.
(2) Measure refrigerant (refer to capacities). Refer
to the instructions provided with the equipment
being used.
(3) Verify engine is shut off. Open the suction and
discharge valves. Open the charge valve to allow the
refrigerant to flow into the system. When the trans-
fer of refrigerant has stopped, close the suction and
discharge valve.
(4) If all of the charge did not transfer from the
dispensing device, put vehicle controls into the fol-
lowing mode:
• Automatic transaxle in park or manual trans-
axle in neutral
• Engine idling at 700 rpm
Turbo
• A/C control set in 100 percent inside air (Recir-
culation)
• Panel mode
• Blower motor ON high speed
• Vehicle windows closed
If the A/C compressor does not engage, test the
compressor clutch control circuit and correct any fail-
ure (Refer to 8 - ELECTRICAL/WIRING DIAGRAM
INFORMATION - DIAGNOSIS AND TESTING).
(5) Open the suction valve to allow the remaining
refrigerant to transfer to the system.
WARNING: TAKE CARE NOT TO OPEN THE DIS-
CHARGE (HIGH-PRESSURE) VALVE AT THIS TIME
(6) Close all valves and test the A/C system perfor-
mance.
(7) Disconnect the charging station or manifold
gauge set. Install the service port caps.
STANDARD PROCEDURE - EVACUATING
REFRIGERANT SYSTEM
NOTE: Special effort must be used to prevent mois-
ture from entering the A/C system oil. Moisture in
the oil is very difficult to remove and will cause a
reliability problem with the compressor.
If a compressor designed to use R-134a refrigerant
is left open to the atmosphere for an extended period
of time. It is recommended that the refrigerant oil be
drained and replaced with new oil or a new compres-
sor be used. This will eliminate the possibility of con-
taminating the refrigerant system.
If the refrigerant system has been open to the
atmosphere, it must be evacuated before the system
can be filled. Moisture and air mixed with the refrig-
erant will raise the compressor head pressure above
acceptable operating levels. This will reduce the per-
formance of the air conditioner and damage the com-
pressor. Moisture will boil at near room temperature
when exposed to vacuum. To evacuate the refrigerant
system:
NOTE: When connecting the service equipment
coupling to the line fitting, verify that the valve of
the coupling is fully closed. This will reduce the
amount of effort required to make the connection.
(1) Connect a suitable charging station, refrigerant
recovery machine or a manifold gauge set with vac-
uum pump and refrigerant recovery equipment.
(2) Open the suction and discharge valves and
start the vacuum pump. The vacuum pump should
run a minimum of 45 minutes prior to charge to
eliminate all moisture in system. When the suction
gauge reads -88 kPa (- 26 in. Hg) vacuum or greater
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