Chrysler Sebring, Stratus sedan, Sebring Convertible. Manual - part 727

(8) If the air outlet temperature fails to meet the

specifications in the A/C Performance Temperature
and Pressure chart, or if the compressor discharge
pressure is high, refer to the A/C Pressure Diagnosis
chart.

A/C PRESSURE DIAGNOSIS

Condition

Possible Causes

Correction

Rapid compressor clutch
cycling (ten or more cycles
per minute).

1. Low refrigerant system
charge.

1. See Refrigerant System Leaks in this group.
Test the refrigerant system for leaks. Repair,
evacuate and charge the refrigerant system, if
required.

Equal pressures, but the
compressor clutch does not
engage.

1. No refrigerant in the
refrigerant system.

1. See Refrigerant System Leaks in this group.
Test the refrigerant system for leaks. Repair,
evacuate and charge the refrigerant system, if
required.

2. Faulty fuse.

2. Check the fuses in the power distribution
center. Repair the shorted circuit or component
and replace the fuses, if required. Refer to Group
8.

3. Faulty A/C compressor
clutch coil.

3. See A/C Compressor Clutch Coil in this group.
Test the compressor clutch coil and replace, if
required.

4. Faulty A/C compressor
clutch relay.

4. See A/C Compressor Clutch Relay in this
group. Test the compressor clutch relay and relay
circuits. Repair the circuits or replace the relay, if
required.

5. Improperly installed or
faulty evaporator temperature
sensor.

5. See Evaporator Temperature Sensor in this
group. Test the sensor and replace, if required.

6. Faulty A/C pressure
transducer.

6. See A/C Pressure Transducer in this group.
Test the sensor and replace, if required.

7. Faulty Powertrain Control
Module (PCM).

7. Refer to the proper Diagnostic Procedures
manual for testing of the PCM. Test the PCM and
replace, if required.

Normal pressures, but A/C
Performance Test air
temperatures at center panel
outlet are too high.

1. Excessive refrigerant oil in
system.

1. See Refrigerant Oil Level in this group.
Recover the refrigerant from the refrigerant
system and inspect the refrigerant oil content.
Restore the refrigerant oil to the proper level, if
required.

2. Blend door actuator
improperly installed or faulty.

2. See Blend Door Actuator in this group. Inspect
the actuator for proper operation and replace, if
required.

3. Blend door inoperative or
sealing improperly.

3. See HVAC Housing in this group. Inspect the
blend door for proper operation and sealing.
Repair if required.

HEATING & AIR CONDITIONING

24 - 7

HEATING & AIR CONDITIONING (Continued)

Condition

Possible Causes

Correction

The low side pressure is
normal or slightly low, and the
high side pressure is too low.

1. Low refrigerant system
charge.

1. See Refrigerant System Leaks in this group.
Test the refrigerant system for leaks. Repair,
evacuate and charge the refrigerant system, if
required.

2. Refrigerant flow through
the A/C evaporator is
restricted.

2. See A/C Evaporator in this group. Replace the
restricted A/C evaporator, if required.

3. Faulty A/C compressor.

3. See A/C Compressor in this group. Replace
the compressor, if required.

The low side pressure is
normal or slightly high, and
the high side pressure is too
high.

1. A/C condenser air flow
restricted.

1. Check the A/C condenser for damaged fins,
foreign objects obstructing air flow through the
condenser fins, and missing or improperly
installed air seals. Clean, repair, or replace
components as required.

2. Refrigerant flow through
the receiver/drier is
restricted.

2. See Receiver/Drier in this group. Replace the
restricted receiver/drier, if required.

3. Inoperative radiator
cooling fan.

3. Test the radiator cooling fan and replace, if
required. Refer to Group 7.

4. Refrigerant system
overcharged.

4. See Refrigerant System Charge in this group.
Recover the refrigerant from the refrigerant
system. Charge the refrigerant system to the
proper level, if required.

5. Air in the refrigerant
system.

5. See Refrigerant System Leaks in this group.
Test the refrigerant system for leaks. Repair,
evacuate and charge the refrigerant system, if
required.

6. Engine overheating.

6. Test the engine cooling system and repair, if
required. Refer to Group 7.

The low side pressure is too
high, and the high side
pressure is too low.

1. Accessory drive belt
slipping.

1. Inspect the accessory drive belt condition and
tension. Tighten or replace the accessory drive
belt, if required. Refer to Group 7.

2. Faulty A/C expansion
valve.

2. See A/C Expansion Valve in this group.
Replace the valve, if required.

3. Faulty A/C compressor.

3. See A/C Compressor in this group. Replace
the compressor, if required.

The low side pressure is too
low, and the high side
pressure is too high.

1. Restricted refrigerant flow
through the refrigerant lines.

1. See Liquid Line, Suction Line and Discharge
Line in this group. Inspect the refrigerant lines for
kinks, tight bends or improper routing. Correct
the routing or replace the refrigerant line, if
required.

2. Restricted refrigerant flow
through the A/C expansion
valve.

2. See A/C Expansion Valve in this group.
Replace the valve, if required.

3. Restricted refrigerant flow
through the A/C condenser.

3. See A/C Condenser in this group. Replace the
restricted condenser, if required.

24 - 8

HEATING & AIR CONDITIONING

HEATING & AIR CONDITIONING (Continued)

HEATER PERFORMANCE

WARNING: Review safety precautions and warnings
in this group before performing this procedure
(Refer to 24 - HEATING & AIR CONDITIONING/
PLUMBING - WARNINGS) and (Refer to 24 - HEAT-
ING & AIR CONDITIONING/PLUMBING - CAUTIONS).
Failure to follow the warnings and cautions could
result in possible personal injury or death.

Before performing the following tests, refer to

Group 7 - Cooling System for the procedures to check
the engine coolant level and flow, engine coolant
reserve/recovery system operation, accessory drive
belt condition and tension, radiator air flow and the
fan drive operation. Perform the Heating and A/C
System Self Diagnostics (Refer to 24 - HEATING &
AIR CONDITIONING - DIAGNOSIS AND TESTING
- HEATING AND A/C SELF DIAGNOSTICS). If any
diagnostic trouble codes (DTCs) are found in the body
control module (BCM) or the powertrain control mod-
ule (PCM), repair as necessary.

HEATER PERFORMANCE TEST

Engine coolant is delivered to the heater core

through two heater hoses. With the engine idling at
normal operating temperature, set the temperature
control to the full hot position, the mode control to
the floor position, and the blower motor control to the
highest speed position. Using a test thermometer,
check the temperature of the air being discharged at
the HVAC housing floor outlets. Compare the test
thermometer reading to the Heater Temperature Ref-
erence chart.

HEATER TEMPERATURE REFERENCE

Ambient Temperature

Minimum Floor Outlet

Temperature

Celsius

Fahrenheit

Celsius

Fahrenheit

15.5°

60°

62.2°

144°

21.1°

70°

63.8°

147°

26.6°

80°

65.5°

150°

32.2°

90°

67.2°

153°

If the heater outlet air temperature is below the

minimum specification, refer to Group 7 - Cooling
System. Both of the heater hoses should be hot to the
touch. The coolant return heater hose should be
slightly cooler than the coolant supply heater hose. If
the return hose is much cooler than the supply hose,
locate and repair the engine coolant flow obstruction
in the cooling system. Refer to Group 7 - Cooling Sys-
tem for more information.

OBSTRUCTED COOLANT FLOW

• Faulty water pump.

• Faulty thermostat.

• Pinched or kinked heater hoses.

• Improper heater hose routing.

• Plugged heater hoses or supply and return ports

at the cooling system connections.

• A plugged heater core.

• Air locked heater core or air in cooling system.
If proper coolant flow through the cooling system is

verified, and heater outlet air temperature is still
low, a mechanical problem may exist.

MECHANICAL PROBLEMS

Possible locations or causes of insufficient heat:
• An obstructed cowl air intake.

• Obstructed heater system outlets.

• A faulty, obstructed or improperly installed

blend-air door or actuator.

• A faulty blower system.

• A faulty A/C-heater control.

TEMPERATURE CONTROL

If the heater outlet air temperature cannot be

adjusted with the temperature control on the heater-
A/C control panel, the following could require service:

• A faulty A/C-heater control.

• Faulty blend door actuator.

• A faulty, obstructed or improperly installed

blend-air door.

• An obstructed cowl air intake.

• The engine cooling system.

HEATING & AIR CONDITIONING

24 - 9

HEATING & AIR CONDITIONING (Continued)

SPECIFICATIONS

HEATING-A/C SYSTEM

A/C SYSTEM - 2.7L/2.4L NA

Item

Description

Notes

A/C
Compressor

Visteon HS-15
(piston type)

VC-46 PAG oil

Freeze–up
Control

Evaporator
temperature
sensor

A/C evaporator
mounted

Low psi Control

A/C pressure
transducer

Discharge line
mounted

High psi Control

Refrigerant
Charge
Capacity

Refer to A/C
Underhood
Specification
Label located in
the engine
compartment

R-134a
refrigerant

A/C Clutch
Current Draw

2 - 4 amps

@ 12V ± 0.5V
@ 21° C (70° F)

A/C Clutch Air
Gap

0.35 - 0.75 mm
(0.014 - 0.030
in.)

A/C SYSTEM - 2.0L/2.4L TURBO

Item

Description

Notes

A/C
Compressor

Sanden
TRS-090 (scroll
type)

SP-15 PAG oil

Freeze-up
Control

Evaporator
temperature
sensor

A/C evaporator
mounted

Low psi Control

A/C pressure
transducer

Discharge line
mounted

High psi Control

Refrigerant
Charge
Capacity

Refer to A/C
Underhood
Specification
Label locared in
the engine
compartment

R-134a
refrigerant

A/C Clutch
Current Draw

2 - 4.15 amps

@ 12 V ± 0.5V
@ 21° C (70° F)

A/C Clutch Air
Gap

0.33 - 0.63 mm
(0.013 - 0.025
in.)

FASTENER TORQUE

Description

N·m

Ft. Lbs.

In. Lbs.

All Screws NOT Listed Below

–

A/C Compressor Shaft Bolt (2.4L NA/2.7L)

–

115

A/C Compressor Shaft Nut (2.0L/2.4L Turbo)

17.5

–

155

A/C Compressor Manifold Bolts (2.4L NA/2.7L)

–

A/C Compressor Mounting Bolts (2.4L NA/2.7L)

–

A/C Compressor Mounting Bolts (2.0L/2.4L Turbo)

–

A/C Condenser Bolts

–

A/C Expansion Valve Bolts

–

Auto Transaxle Cooler Lines to Condenser Nuts

–

Discharge Line to Compressor Bolt

–

Discharge Line to Condenser Bolt

–

Liquid Line to Condenser Bolt (2.0L/2.4L NA/2.7L)

–

Refrigerant Lines to Expansion Valve Nut

–

Suction Line to Compressor Bolt

–

24 - 10

HEATING & AIR CONDITIONING

HEATING & AIR CONDITIONING (Continued)

Content .. 725 726 727 728 ..