Jeep Grand Cherokee WK. Manual — part 1785
INSTALLATION
3.7L/4.7L ENGINES
1. Position the A/C suction line (6) into the engine
compartment.
2. Remove the tape or plugs from the suction line fit-
tings and the A/C compressor (2) and A/C expan-
sion valve (8).
3. Lubricate a new O-ring and a dual plane seal with
clean refrigerant oil and install them onto the A/C
suction line. Use only the specified seals as they
are made of a special material for the R-134a sys-
tem. Use only refrigerant oil of the type recom-
mended for the A/C compressor in the vehicle.
4. Install the A/C suction line onto the A/C compres-
sor.
5. Install the nut (1) that secures the A/C suction line
to the A/C compressor. Tighten the nut to 20 N·m
(15 ft. lbs.).
6. Install the A/C suction line onto the A/C expansion
valve.
7. Install the nut (7) that secures the A/C suction line to the A/C expansion valve. Tighten the nut to 23 N·m (17 ft.
lbs.).
8. Install the air intake tube and the resonator (Refer to 9 - ENGINE/AIR INTAKE SYSTEM/AIR CLEANER HOUS-
ING - INSTALLATION).
9. Reconnect the negative battery cable.
10. Evacuate the refrigerant system (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - STANDARD
PROCEDURE - REFRIGERANT SYSTEM EVACUATE).
11. Charge the refrigerant system (Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING - STANDARD PRO-
CEDURE - REFRIGERANT SYSTEM CHARGE).
5.7L ENGINE
1. Position the A/C suction line (3) into the engine
compartment.
2. Remove the tape or plugs from the opened suction
line fittings and the compressor and expansion
valve ports.
3. Lubricate a new O-ring and a new dual plane seal
with clean refrigerant oil and install them onto the
A/C suction line. Use only the specified seals as
they are made of a special material for the R-134a
system. Use only refrigerant oil of the type recom-
mended for the A/C compressor in the vehicle.
4. Install the A/C suction line onto the A/C compressor
(4).
5. Install the nut (2) that secures the A/C suction line
to the A/C compressor. Tighten the nut to 20 N·m
(15 ft. lbs.).
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6. Install the A/C suction line (2) into the retaining
bracket (9) and to the A/C expansion valve (1).
7. Install the nut (3) that secures the A/C suction line
to the A/C expansion valve. Tighten the nut to 23
N·m (17 ft. lbs.).
8. Install the air intake tube and the resonator (Refer
to 9 - ENGINE/AIR INTAKE SYSTEM/HOUSING-
AIR CLEANER - INSTALLATION).
9. Reconnect the negative battery cable.
10. Evacuate the refrigerant system (Refer to 24 -
HEATING & AIR CONDITIONING/PLUMBING -
STANDARD
PROCEDURE
-
REFRIGERANT
SYSTEM EVACUATE).
11. Charge the refrigerant system (Refer to 24 -
HEATING & AIR CONDITIONING/PLUMBING -
STANDARD
PROCEDURE
-
REFRIGERANT
SYSTEM CHARGE).
OIL-A/C REFRIGERANT
DESCRIPTION
The refrigerant oil used in R-134a refrigerant systems is a synthetic-based, polyalkylene glycol (PAG), wax-free
lubricant. Mineral-based R-12 refrigerant oils are not compatible with PAG oils, and should never be introduced to
an R-134a refrigerant system.
There are different PAG oils available, and each contains a different additive package. The Denso 10S17 A/C com-
pressor used in this vehicle is designed to use ND-8 PAG refrigerant oil. Use only this type of refrigerant oil the
refrigerant system.
OPERATION
After performing any refrigerant recovery or recycling operation, always replenish the refrigerant system with the
same amount of the recommended refrigerant oil as was removed. Too little refrigerant oil can cause A/C compres-
sor damage, and too much can reduce A/C system performance.
PAG refrigerant oil is more hygroscopic than mineral oil, and will absorb any moisture it comes into contact with,
even moisture in the air. The PAG oil container should always be kept tightly capped until it is ready to be used.
After use, recap the oil container immediately to prevent moisture contamination.
STANDARD PROCEDURE
REFRIGERANT OIL LEVEL
When an A/C system is assembled at the factory, all components except the A/C compressor are refrigerant oil free.
After the refrigerant system has been charged and operated, the refrigerant oil in the A/C compressor is dispersed
throughout the refrigerant system. The receiver/drier, A/C evaporator, A/C condenser and the A/C compressor will
each retain a significant amount of the needed refrigerant oil.
It is important to have the correct amount of refrigerant oil in the A/C system. This ensures proper lubrication of the
A/C compressor. Too little oil will result in damage to the A/C compressor, while too much oil will reduce the cooling
capacity of the A/C system and consequently result in higher discharge air temperatures.
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CAUTION: The oil used in the Denso 10S17 A/C compressor is ND-8 PAG R-134a refrigerant oil. Only refrig-
erant oil of the same type should be used to service the A/C system. Do not use any other refrigerant oil.
The oil container should be kept tightly capped until it is ready for use and then tightly capped after use to
prevent contamination from dirt and moisture. Refrigerant oil will quickly absorb any moisture it comes in
contact with, therefore, special effort must be used to keep all R-134a system components moisture-free.
Moisture in the refrigerant oil is very difficult to remove and will cause a reliability problem with the A/C
compressor.
NOTE: Most reclaim/recycling equipment will measure the lubricant being removed during recovery. This
amount of lubricant should be added back into the system. Refer to the reclaim/recycling equipment man-
ufacturers instructions.
It will not be necessary to check the oil level in the A/C compressor or to add oil, unless there has been an oil loss.
An oil loss may occur due to a rupture or leak from a refrigerant line, a connector fitting, a component, or a com-
ponent seal. If a leak occurs, add 30 milliliters (1 fluid ounce) of refrigerant oil to the refrigerant system after the
repair has been made. Refrigerant oil loss will be evident at the leak point by the presence of a wet, shiny surface
around the leak.
Refrigerant oil must be added when a receiver/drier, A/C evaporator or A/C condenser is replaced. See the Refrig-
erant Oil Capacities chart. When an A/C compressor is replaced, the refrigerant oil must be drained from the old
compressor and measured. Drain all of the refrigerant oil from the new A/C compressor, then fill the new compres-
sor with the same amount of refrigerant oil that was drained out of the old compressor.
REFRIGERANT OIL CAPACITIES
COMPONENT NAME
ml.
oz.
Total System Fill
130 ml.
4.4 oz.
A/C Condenser
30 ml.
1.0 oz.
A/C Evaporator
40 ml.
1.4 oz.
Receiver/drier
30 ml.
1.0 oz.
A/C Compressor
Drain and measure the oil from the old
compressor. See text.
RECEIVER/DRIER-A/C
DESCRIPTION
The receiver/drier (1) stores unnecessary refrigerant,
filters the refrigerant, helps remove moisture from the
refrigerant and retains any refrigerant vapor that may
leave the A/C condenser (2) until it becomes a liquid.
The receiver/drier is installed on the high-side of the
A/C system and is connected directly to the right end
of the A/C condenser. The receiver/drier can be easily
serviced by removing the grille and air cleaner
housing.
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OPERATION
The receiver/drier performs a filtering action to prevent foreign material in the refrigerant from contaminating the A/C
expansion valve. Refrigerant enters the receiver/drier as a high-pressure, low temperature liquid. Desiccant inside
the receiver/drier absorbs any moisture which may have entered and become trapped within the refrigerant system.
In addition, during periods of high demand operation of the A/C system, the receiver/drier acts as a reservoir to
store surplus refrigerant.
The receiver/drier cannot be repaired. If the receiver/drier is faulty or damaged, or if the refrigerant system has been
contaminated or left open to the atmosphere for an indeterminable period or if the A/C compressor has failed, it
must be replaced.
REMOVAL
WARNING: Refer to the applicable warnings and cautions for this system before performing the following
operation (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.
1. Recover the refrigerant from the refrigerant system
(Refer to 24 - HEATING & AIR CONDITIONING/
PLUMBING
-
STANDARD
PROCEDURE
-
REFRIGERANT SYSTEM RECOVERY).
2. Disconnect and isolate the negative battery cable.
3. Remove the grille (Refer to 23 - BODY/EXTERIOR/
GRILLE - REMOVAL).
4. Remove the air cleaner housing and air inlet tube
(Refer to 9 - ENGINE/AIR INTAKE SYSTEM/
HOUSING-AIR CLEANER - REMOVAL).
5. Remove the nut (1) that secures the A/C liquid line
(2) to the receiver/drier (3).
6. Remove the A/C liquid line from the receiver/drier
and remove and discard the dual-plane seal.
7. Remove the screw (4) that secures the receiver/
drier to the radiator and fan shroud (5).
8. Remove the nut (6) that secures the receiver/drier
to the A/C condenser (7).
9. Disconnect the receiver/drier from the A/C condenser and remove and discard the dual-plane seal.
10. Install plugs in, or tape over the opened receiver/drier fitting and port and the condenser port.
INSTALLATION
NOTE: If the receiver/drier is being replaced, add 30 milliliters (1 fluid ounce) of refrigerant oil to the refrig-
erant system. Use only the refrigerant oil of the type recommended for the A/C compressor in the vehicle.
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