Jeep Liberty KJ. Manual — part 1401
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 accumulator is
restricted.
2. See A/C Accumulator in this group. Replace
the restricted accumulator, if required.
3. Refrigerant flow through
the A/C evaporator is
restricted.
3. See A/C Evaporator in this group. Replace the
restricted A/C evaporator, if required.
4. Faulty A/C compressor.
4. See A/C Compressor in this group. Replace
the A/C 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. Inoperative radiator
cooling fan.
2. Test the radiator cooling fan and replace, if
required. Refer to Group 7.
3. Refrigerant system
overcharged.
3. See Refrigerant System Charge Level in this
group. Recover the refrigerant from the
refrigerant system. Charge the refrigerant system
to the proper level, if required.
4. Air in the refrigerant
system.
4. See Refrigerant System Leaks in this group.
Test the refrigerant system for leaks. Repair,
evacuate and charge the refrigerant system, if
required.
5. Engine overheating.
5. 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 orifice tube.
2. See A/C Orifice Tube in this group. Replace
the liquid line, if required.
3. Faulty A/C compressor.
3. See A/C Compressor in this group. Replace
the A/C 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 A/C
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 orifice tube.
2. See A/C Orifice Tube in this group. Replace
the liquid line, 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.
HEATER PERFORMANCE
Before performing the following tests, refer to Group 7 - Cooling for the procedures to check the engine coolant
level and flow, engine coolant reserve/recovery system operation, accessory drive belt condition and tension, radi-
ator air flow and the fan drive operation.
WARNING: Do not remove radiator cap when engine is hot, personal injury can result.
24 - 6
HEATING & AIR CONDITIONING
KJ
If vehicle has been run recently, wait 15 minutes before removing the radiator cap. Place a rag over the cap and
turn it to the first safety stop. Allow pressure to escape through the overflow tube. When the system pressure sta-
bilizes, remove the cap completely.
MAXIMUM HEATER OUTPUT
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 front floor outlets. Compare the test thermometer reading to the Heater Temperature Reference
chart.
HEATER TEMPERATURE REFERENCE
Ambient Air Temperature
16° C
(60° F)
21° C
(70° F)
26° C
(80° F)
32° C
(90° F)
Minimum Air Temperature at
Floor Outlet
52° C
(125° F)
56° C
(133° F)
59° C
(139° F)
62° C
(144° F)
If the heater outlet air temperature is below the minimum specification, refer to Group 7 - Cooling. 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 for more information.
OBSTRUCTED COOLANT FLOW
Possible locations or causes of obstructed coolant flow are as follows:
•
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.
•
Plugged heater core.
If proper coolant flow through the cooling system is verified, and heater outlet air temperature is low, a mechanical
problem may exist.
MECHANICAL PROBLEMS
Possible causes of insufficient heat due to mechanical problems are as follows:
•
Obstructed cowl air intake.
•
Obstructed heater system outlets.
•
Faulty engine thermostat.
•
Faulty blower motor system.
•
Faulty A/C-heater control.
•
Faulty blend door actuator.
•
Faulty, obstructed or improperly installed blend-air door.
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be adjusted with the temperature control on the A/C-heater control, the
following could require service:
•
Faulty A/C-heater control.
•
Faulty blend door actuator.
•
Faulty, obstructed or improperly installed blend-air door.
•
Faulty related wiring harness or connectors.
•
Improper engine coolant temperature.
KJ
HEATING & AIR CONDITIONING
24 - 7
SPECIFICATIONS
A/C SYSTEM
Item
Description
Notes
A/C Compressor
Denso 10S17 (2.8L diesel engine)
ND-8 PAG oil
Visteon HS-18 (3.7L engine)
VC-46 PAG oil
Freeze–up Control
A/C low pressure switch
Input to PCM, accumulator mounted
- cycles clutch off below -1° C (30°
F), cycles back on above 7.2° C
(45° F)
Low psi Control
A/C low pressure switch
Opens below 141 kPa (20.5 psi),
resets above 234 - 262 kPa (34 - 38
psi)
High psi Control
A/C high pressure switch (diesel
engine)
A/C discharge line mounted - opens
at discharge pressure above 3100 -
3375 kPa (450 - 490 psi), resets at
1860 - 2275 kPa (270 - 330 psi)
A/C pressure transducer (gasoline
engines)
A/C discharge line mounted - opens
at discharge pressure above 2971
kPa (431 psi) and below 206 kPa
(30 psi)
Refrigerant Charge Capacity
Refer to the A/C Underhood
Specification Label located in the
engine compartment.
R-134a refrigerant
A/C Clutch Coil Draw
2.2 - 2.3 amps @ 12V ± 0.5V @
21° C (70° F)
2.8L diesel engine. A/C Clutch Field
Coil Resistance when measured
across coil lead connector is 3.6 ±
0.2 ohms.
3.1 - 4 amps @ 12V ± 0.5V @ 21°
C (70° F)
3.7L engine
A/C Clutch Air Gap
0.35 - 0.60 mm (0.014 - 0.024 in.)
2.8L diesel engine
0.35 - 0.65 mm (0.014 - 0.025 in.)
3.7L engine
TORQUE
Description
N·m
Ft. Lbs.
In. Lbs.
All Screws NOT Listed
Below
2
—
17
A/C Compressor to Engine
(2.8L Engine)
24.5
18
—
A/C Compressor to
Mounting Bracket Bolts
(3.7L Engine–Rear and
Inboard Front Bolts)
55
41
—
A/C Compressor to
Mounting Bracket Bolt
(3.7L Engine–Outboard
Front Bolt)
40
30
—
A/C Compressor Clutch
Plate Bolt (2.8L)
20
15
—
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HEATING & AIR CONDITIONING
KJ
Description
N·m
Ft. Lbs.
In. Lbs.
A/C Compressor Clutch
Plate Bolt (3.7L)
15
—
133
A/C Condenser to
Radiator Bolts
5
—
44
Accumulator Bracket to
Dash Nuts
4.5
—
40
Automatic Transmission
Cooler to Radiator Bolts
5
—
44
Condenser Upper Bracket
to Radiator Bolts
5
—
44
Diesel Engine Coolant
Heater to Mounting
Bracket Bolts
33
25
—
HVAC Housing to Engine
Side of Dash Panel Nuts
6
—
53
HVAC Housing to
Passenger Side of Dash
Panel Nuts
6
—
53
Liquid Line Bracket to
Dash Panel Nut
5
—
44
Liquid Line Front to Rear
Section Nut
22.5
—
200
Refrigerant Lines to A/C
Evaporator Nuts (RHD
Models Only)
12.5
—
110
Refrigerant Lines to A/C
Compressor Bolts (2.8L
Engine)
12
—
106
Refrigerant Lines to A/C
Compressor Nuts (3.7L
Engine)
12
—
105
Refrigerant Lines to A/C
Condenser Nuts
22.5
—
200
Suction Line to
Accumulator Nuts
12.5
—
110
KJ
HEATING & AIR CONDITIONING
24 - 9
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