1999 DODGE RAM Service Repair Manual

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Page 17 of 1691

DODGE RAM 1999 Service Repair Manual Use only NEW, moisture-free refrigerant oil in A/C systems.
Refrigerant oil is highly refined with a very low moisture content.
Oil container must be tightly closed when not in use, or moistu

Use only NEW, moisture-free refrigerant oil in A/C systems.
Refrigerant oil is highly refined with a very low moisture content.
Oil container must be tightly closed when not in use, or moisture from
air will be absorbed into refrigerant oil.
Refrigerant R-134a systems use Polyalkylene Glycol (PAG)
refrigerant oil. Using a mineral oil based lubricant with R-134a
systems will result in A/C compressor failure due to lack of proper
lubrication.
All compressors have different lubrication requirements and
use different Polyalkylene Glycol (PAG) refrigerant oils. Use only the\
specified PAG refrigerant oil for the appropriate system and A/C
compressor. Always check the underhood A/C specification label or A/C
compressor label before adding refrigerant oil to A/C
compressor/system. See listing of refrigerant oils currently available
from the vehicle manufacturers.
NOTE: PAG oil absorbs moisture very rapidly, 2.3-5.6 percent by
weight as compared to a mineral oil absorption rate of .005
percent by weight.
CHRYSLER CORP., JEEP & EAGLE
Use ND-8 PAG oil, SUN PAG 56 oil, SP-10 PAG oil, or SP-20 PAG
oil.
FORD MOTOR CO.
Use YN-12B or YN-12C PAG Refrigerant Oil (specification WSH-
M1C231-B) or SP-20 PAG Oil (specification WST-M1C231-B2).
GENERAL MOTORS
On all models except Saturn, use PAG Refrigerant Oil (Part
No. 12345923). On Saturn, use Saturn PAG refrigerant oil.
SERVICING PRECAUTIONS
DISCHARGING SYSTEM
Discharge A/C system, using approved refrigerant
recovery/recycling equipment before loosening any fittings. Follow
refrigerant recovery/recycling equipment manufacturer's instructions.
DISCONNECTING LINES & FITTINGS
After system is discharged, carefully clean area around all
fittings to be opened. Always use 2 wrenches when loosening or
tightening fittings. Some refrigerant lines are connected with a
spring-lock coupling. Special tools may be required to disconnect
lines. To prevent dirt and moisture from entering system, cap all
openings as soon as lines are removed. DO NOT remove service valve
caps until ready to connect lines and fittings.
NOTE: All R-134a based systems use 1/2-16 ACME threaded fittings.
Ensure all replacement parts match the connections of the
system being worked on.
CONNECTING LINES & FITTINGS
Always use new a gasket or "O" rings when connecting lines or

Page 18 of 1691

DODGE RAM 1999 Service Repair Manual fittings. Coat "O" rings with refrigerant oil, and ensure it is not
twisted during installation. To prevent damage to lines and fittings,
always use 2 wrenches or specified tools. Keep refrigerant oil

fittings. Coat "O" rings with refrigerant oil, and ensure it is not
twisted during installation. To prevent damage to lines and fittings,
always use 2 wrenches or specified tools. Keep refrigerant oil off
fitting threads. Long term contact of oil on threads may cause future
damage to threads.
PLACING SYSTEM IN OPERATION
After component service or replacement has been completed,
evacuate system thoroughly with a vacuum pump. Charge system with
proper amount of refrigerant. See REFRIGERANT OIL & REFRIGERANT
SPECIFICATIONS article in GENERAL SERVICING. Perform leak test. After
system has been leak tested, check system operation.
NOTE: A/C systems normally will not need additional refrigerant oil
unless oil loss has occurred due to ruptured lines, leaking
compressor seals, compressor overhaul or component
replacement.
CHECKING COMPRESSOR OIL
FORD FS-10 10-CYLINDER
1) Slowly discharge A/C system, using approved refrigerant
recovery/recycling equipment. Remove A/C compressor. Drain as much
compressor oil from suction and discharge ports as possible. Rotate
compressor shaft 6-8 revolutions by hand, while pouring oil from
ports. Collect oil in a clean container and measure amount drained. DO
NOT reuse old refrigerant oil.
2) If amount drained is 3-5 ounces, add amount drained plus
one ounce of refrigerant oil to replacement compressor. If amount
drained is more than 5 ounces, add the same amount that was drained
from old compressor. If amount drained is less than 3 ounces, add 3
ounces to compressor. See FORD FS-10 COMPONENT REFRIGERANT OIL
CAPACITIES table. Add refrigerant oil to replacement compressor
through suction port.
3) Use new "O" rings on refrigerant lines. Install A/C
compressor. Evacuate and charge system. Perform leak test. Ensure A/C
system is operating properly.
FORD FS-10 COMPONENT REFRIGERANT OIL CAPACITIES
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Component Ounces
Accumulator/Receiver-Drier
Except Villager .............................................. ( 1)
Villager ..................................................... 2.0
Condenser
Except Contour, Cougar, Mystique, Villager & Windstar ........ 1.0
Contour & Mystique ........................................... 0.7
Villager ................................................. 1.0-1.7
Windstar ..................................................... 1.5
Evaporator
Except Contour, Mystique, Villager & Windstar ................ 3.0
Contour & Mystique ........................................... 0.7
Villager (Front Or Rear) ................................. 1.5-2.5\
Windstar ..................................................... 4.0
Other Components ( 2) ........................................... 2.0
Refrigerant Lines ( 3)
Contour, Cougar & Mystique ................................ 1.0-1.7
( 1) - Drain and measure oil from old accumulator. On Continental,

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DODGE RAM 1999 Service Repair Manual Contour, Cougar, Escort, Mustang, Mystique, Tracer and Windstar,
drill two 1/2" holes in bottom of old accumulator, and drain. On
all models, add the same amount of oil drained plus

Contour, Cougar, Escort, Mustang, Mystique, Tracer and Windstar,
drill two 1/2" holes in bottom of old accumulator, and drain. On
all models, add the same amount of oil drained plus 2 ounces of
refrigerant oil to new accumulator.
(2) - Add refrigerant oil following replacement of other system
components such as hoses, fixed orifice tube, A/C clutch cycling
switch, A/C compressor pressure relief valve, system pressure
cut-off switch, or service valve, compressor shaft seal, "O"
ring or hose leaks.
( 3) - If all lines have been replaced.
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HARRISON HD6/HT6, HD6/HR-6HE 6-CYL., V5 5-CYL. & V7 7-CYL.
NOTE: Replacement compressor may be shipped with 8-9 ounces of
refrigerant oil. Drain shipping refrigerant oil into a clean
container and retain for use.
1) If possible, operate system for several minutes to
stabilize system. Turn engine off. Discharge A/C system, using
approved refrigerant recovery/recycling equipment. Remove A/C
compressor. Drain and measure refrigerant oil from old compressor
through suction and discharge ports, and drain plug.
2) If no compressor oil leaks exist, and more than one ounce
is drained, add amount drained from old compressor. If less than one
ounce is drained from old compressor, add 2 ounces of refrigerant oil.
3) When replacing other A/C components, add specified amount
of refrigerant oil to component. See HD6/HT6, HD6/HR-6HE, V5 & V7
COMPONENT REFRIGERANT OIL CAPACITIES table. Install compressor drain
plug and compressor. Evacuate and charge system. Perform leak test.
Ensure A/C system is operating properly.
NOTE: Approximately 3 ounces of refrigerant oil, suspended in
refrigerant, will be lost due to a large, abrupt leak. When
replacing a faulty A/C component, add amount of oil specified
for component plus 3 ounces to compensate for oil loss. If
oil cannot easily be added to component, add it to
accumulator.
HD6/HT6, HD6/HR-6HE V5 & V7 COMPONENT REFRIGERANT OIL CAPACITIES
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Component Ounces
Cars
Accumulator/Receiver-Drier
Except "F", "N", "V" & "W" Bodies .......................... 3.5
"F", "N", "V" & "W" Bodies ................................. ( 1)
Compressor
"C" Body ................................................... ( 2)
"E", "K", "V" & "Y" Bodies ................................. 2.0
"F", "G", "H", "J", "P", "N" & "W" Bodies .................. ( 3)
Condenser .................................................... 1.0
Evaporator ................................................... 3.0
Trucks & Vans
Accumulator/Receiver-Drier
Except "U" Series .......................................... 3.5
"U" Series ................................................. ( 4)
Compressor
Except "U" Series .......................................... ( 3)
"U" Series ................................................. ( 2)
Condenser
Except "U" Series .......................................... 1.0
"U" Series ................................................. ( 4)

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DODGE RAM 1999 Service Repair Manual Evaporator
Except "U" Series .......................................... 3.0
"U" Series ................................................. (4)
( 1) - Add amount drained from old accumulato

Evaporator
Except "U" Series .......................................... 3.0
"U" Series ................................................. (4)
( 1) - Add amount drained from old accumulator/receiver-drier plus one
ounce.
( 2) - Ensure replacement compressor contains the same amount of
refrigerant oil as was drained from old compressor.
( 3) - Drain and measure refrigerant oil from old compressor. If old
compressor had less than one ounce, add 2 ounces of refrigerant
oil to replacement compressor. If old compressor had more than
one ounce, add the same amount of refrigerant oil to replacement
compressor.
( 4) - Information not available from manufacturer.
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NIPPONDENSO 10-CYLINDER
General Motors (Metro & Tracker)
1) Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Remove A/C compressor. Drain, measure
and discard refrigerant oil from old compressor. Drain refrigerant oil
from replacement compressor. Add refrigerant oil to replacement
compressor equal to amount drained from oil compressor.
2) Add specified amount of refrigerant oil to components that
are replaced during compressor replacement. See NIPPONDENSO 10-
CYLINDER COMPONENT REFRIGERANT OIL CAPACITIES table. Install A/C
compressor. Evacuate and charge system. Perform leak test.
NIPPONDENSO 10-CYLINDER COMPONENT REFRIGERANT OIL CAPACITIES
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Component Ounces
Compressor ..................................................... 3.0
Condenser .................................................. 0.7-1.0
Receiver-Drier ................................................. 0.3
System Total ................................................... 3.4
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NIPPONDENSO 10PA17/10PA17C 10-CYL.
Chrysler Corp. (Avenger & Sebring Coupe)
1) Remove A/C compressor. Drain and measure oil from old
compressor. Replacement compressor is shipped with 3.4 ounces of oil.
From replacement compressor, drain the difference between system oil
capacity and amount of oil drained from replacement compressor.
2) Add specified amount of refrigerant oil to components that
are replaced during compressor replacement. See 10PA17/10PA17C
COMPONENT REFRIGERANT OIL CAPACITIES table. When replacing components
listed, DO NOT exceed system total capacity.
Chrysler Corp. & Jeep (Caravan, Concorde, Grand Cherokee,
Intrepid, LHS, Neon, Town & Country, Voyager & 300M)
1) Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Disconnect refrigerant hoses at
compressor. Remove compressor bolts and A/C compressor.
2) Remove suction port on top of A/C compressor, and drain
and measure oil. On Grand Cherokee, add the same amount of oil drained
from old compressor to replacement compressor.
3) On all other models, add amount of oil to compressor equal
to the total system capacity minus amount retained in components that
are not being replaced. See 10PA17/10PA17C COMPONENT REFRIGERANT OIL
CAPACITIES table. Install A/C compressor. Evacuate and charge A/C

Page 21 of 1691

$DODGE RAM 1999 Service Repair Manual system. Perform leak test. 10PA17/10PA17C COMPONENT REFRIGERANT OIL CAPACITIES ��\ ��\ ��\ ��\ ��\ ��\ �$

system. Perform leak test.
10PA17/10PA17C COMPONENT REFRIGERANT OIL CAPACITIES
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Component Ounces
Avenger & Sebring Coupe
Compressor ................................................... (1)
Condenser .................................................... 1.4
Evaporator ................................................... 1.4
Receiver-Drier ............................................... 0.3
Suction Hose ................................................. 0.3
System Total ................................................. 2.7
Concorde, Intrepid, LHS & 300M
Compressor ............................................... ( 1) 5.0
Condenser .................................................... 1.0
Evaporator ................................................... 2.0
Receiver-Drier ............................................... 1.0
Leaking/Blown Line ........................................... 1.5
System Total ................................................. 5.0
Caravan, Town & Country, & Voyager
With Rear Unit
Compressor ................................................. ( 1)
Condenser .................................................. 1.0
Front Evaporator ........................................... 2.0
Rear Evaporator ............................................ 2.0
Receiver-Drier ............................................. 1.0
A/C System Total ........................................... 7.4
Without Rear Unit
Compressor ................................................. ( 1)
Condenser .................................................. 1.0
Evaporator ................................................. 2.0
Receiver-Drier ............................................. 1.0
A/C System Total ........................................... 5.0
Grand Cherokee
Accumulator .................................................. 4.0
Compressor ................................................... ( 2)
Condenser .................................................... 1.0
Evaporator ................................................... 2.0
Refrigerant Line ............................................. 1.0
System Total ................................................. 7.4
Neon
Compressor ................................................... ( 3)
Condenser .................................................... 1.0
Evaporator ................................................... 2.0
Receiver-Drier ............................................... 1.0
Refrigerant Line ............................................. 1.5
System Total ................................................. 6.8
( 1) - Replacement compressor is shipped with specified amount of
refrigerant oil.
( 2) - Ensure replacement compressor contains the same amount of
refrigerant oil as was drained from old compressor.
( 3) - Add amount drained from removed compressor, plus amount
recovered from system, to replacement compressor. DO NOT exceed
system total.
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SANDEN SCROLL
Ford Motor Co. (Taurus 3.4L SHO)
1) Slowly discharge A/C system, using approved refrigerant
recovery/recycling equipment. Remove A/C compressor. Drain as much

Page 22 of 1691

DODGE RAM 1999 Service Repair Manual compressor oil from suction and discharge ports as possible. Rotate
compressor shaft 6-8 revolutions by hand, while pouring oil from
ports. Collect oil in a clean container and measure amount drained.

compressor oil from suction and discharge ports as possible. Rotate
compressor shaft 6-8 revolutions by hand, while pouring oil from
ports. Collect oil in a clean container and measure amount drained. DO
NOT reuse old refrigerant oil.
2) If amount drained is 3-5 ounces, add amount drained plus
one ounce of refrigerant oil to compressor. If amount drained is more
than 5 ounces, add the same amount that was drained from compressor.
If amount drained is less than 3 ounces, add 3 ounces to compressor.
See SANDEN SCROLL COMPONENT REFRIGERANT OIL CAPACITIES (TAURUS 3.4L
SHO) table. Add refrigerant oil through suction port.
3) Use new "O" rings on refrigerant lines. Install A/C
compressor. Perform leak test. Evacuate and charge system. Ensure A/C
system is operating properly.
SANDEN SCROLL COMPONENT REFRIGERANT OIL CAPACITIES (TAURUS 3.4L SHO)
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Component Ounces
Accumulator .................................................... (1)
Condenser ...................................................... 1.0
Evaporator ..................................................... 3.0
Other Components ........................................... ( 2) 2.0
( 1) - Drill two 1/2" holes in bottom of old accumulator, and drain and
measure oil. Add the same amount of oil drained plus 2 ounces of
new refrigerant oil to replacement accumulator.
( 2) - Add specified amount of refrigerant oil following replacement of
other system components such as hoses, fixed orifice tube, A/C
clutch cycling switch, compressor pressure relief valve, system
pressure cut-off switch, or service valve, compressor shaft
seal, "O" ring or hose leaks.
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SANDEN MSC90-C SCROLL
Chrysler Corp. (Avenger & Sebring Coupe)
1) Drain oil from old compressor, and measure amount drained.
Replacement compressor is shipped with 5.7 ounces of refrigerant oil.
From replacement compressor, drain the difference between system oil
capacity and amount of oil drained from replacement compressor.
2) Add specified amount of refrigerant oil for components
that are replaced. See SANDEN MSC90-C COMPONENT REFRIGERANT OIL
CAPACITIES table. When replacing components listed, DO NOT exceed
system total capacity.
SANDEN MSC90-C COMPONENT REFRIGERANT OIL CAPACITIES
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Component Ounces
Condenser ...................................................... 0.5
Evaporator ..................................................... 2.0
Receiver-Drier ................................................. 0.3
Refrigerant Line ............................................... 0.3
System Total ................................................... 5.7
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SANDEN SD-7H15 7-CYLINDER
Chrysler Corp. & Jeep (Cherokee, Dakota, Durango, Ram Pickup
& Wrangler)
1) Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Remove compressor and drain refrigerant
oil. Measure amount of oil removed and discard old oil.

Page 23 of 1691

DODGE RAM 1999 Service Repair Manual 2) Drain oil from replacement compressor. Using new
refrigerant oil, fill replacement compressor with the same amount of
oil drained from the old compressor. If replacing A/C components, add

2) Drain oil from replacement compressor. Using new
refrigerant oil, fill replacement compressor with the same amount of
oil drained from the old compressor. If replacing A/C components, add
specified amount of refrigerant oil to each component. See SD-7H15
COMPONENT REFRIGERANT OIL CAPACITIES table for component capacities.
If oil cannot easily be added to component, add oil to accumulator.
Evacuate and charge system. Perform leak test.
Ford Motor Co. (Super Duty Pickup)
1) Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Remove A/C compressor. Drain as much
compressor oil from suction and discharge ports as possible. Rotate
compressor shaft 6-8 revolutions by hand, while pouring oil from
ports. Collect oil in a clean container and measure amount drained. DO
NOT reuse old refrigerant oil.
2) If amount drained is 3-5 ounces, add amount drained plus
one ounce of refrigerant oil to compressor. If amount drained is more
than 5 ounces, add the same amount that was drained from compressor.
If amount drained is less than 3 ounces, add 3 ounces to compressor.
See SD-7H15 COMPONENT REFRIGERANT OIL CAPACITIES table. Add
refrigerant oil through suction port.
3) Use new "O" rings on refrigerant lines. Install A/C
compressor. Perform leak test. Evacuate and charge system.
SANDEN SD-7H15 COMPONENT REFRIGERANT OIL CAPACITIES
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Component Ounces
Chrysler Corp
Dakota, Durango & Ram Pickup
Accumulator ................................................ 4.0
Compressor ................................................. ( 1)
Condenser .................................................. 1.0
Evaporator ................................................. 2.0
System Total ............................................... 7.8
Ford Motor Co.
Super Duty Pickup
Accumulator ................................................ ( 2)
Condenser .................................................. 1.0
Evaporator ................................................. 3.0
Other Components ( 3) ....................................... 2.0
Jeep
Cherokee & Wrangler
Accumulator ................................................ 4.0
Compressor ................................................. ( 1)
Condenser .................................................. 1.0
Evaporator ................................................. 2.0
Refrigerant Line ........................................... 1.0
System Total ............................................... 8.1
( 1) - Drain and measure oil from old compressor. Using new refrigerant
oil, add the same amount drained from old compressor to
replacement compressor.
( 2) - Ensure replacement accumulator contains the same amount of
refrigerant oil that was drained from old accumulator, plus 2
ounces.
( 3) - Add specified amount of refrigerant oil when replacing other
components such as a fixed orifice tube or hose.
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SANDEN TRS-90 & TR-105 SCROLL
1) Slowly discharge A/C system, using approved refrigerant

Page 24 of 1691

DODGE RAM 1999 Service Repair Manual recovery/recycling equipment. Measure amount of oil drained during A/C
system discharge. Disconnect refrigerant hoses at compressor. Remove
compressor bolts and A/C compressor.
2) Drain and m

recovery/recycling equipment. Measure amount of oil drained during A/C
system discharge. Disconnect refrigerant hoses at compressor. Remove
compressor bolts and A/C compressor.
2) Drain and measure oil from suction and discharge ports of
old compressor. Drain oil from replacement compressor and save. Add
the same amount of refrigerant oil to replacement compressor as was
drained from old compressor. When repairing an excessive leak in A/C
system, add one ounce additional oil to compressor.
3) Add proper amount of refrigerant oil to any components
being replaced. DO NOT add more refrigerant oil than A/C system total.
See SANDEN TRS-90 & TR-105 COMPONENT REFRIGERANT OIL CAPACITIES table.
Install compressor. Evacuate, charge and leak test A/C system. Ensure
A/C system operates properly.
SANDEN TRS-90 & TR-105 COMPONENT REFRIGERANT OIL CAPACITIES
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Component Ounces
Breeze, Cirrus, Sebring Convertible & Stratus
Compressor ................................................... (1)
Condenser .................................................... 1.0
Evaporator ................................................... 2.0
Receiver-Drier ............................................... 1.0
Refrigerant Line ............................................. 1.5
System Total ................................................. 5.0
Ram Van/Wagon
Compressor ................................................... ( 1)
Condenser .................................................... 1.0
Evaporator
Front ...................................................... 2.0
Rear ....................................................... 2.0
Receiver-Drier ............................................... 1.0
System Total
With Rear Unit ............................................ 10.0
Without Rear Unit .......................................... 8.0
( 1) - Ensure replacement compressor contains the same amount of
refrigerant oil as was drained from old compressor.
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ZEXEL ROTARY VANE
1) Slowly discharge A/C system, using approved refrigerant
recovery/recycling equipment. Remove old A/C compressor. Install
compressor oil drain Adapters (SA9149AC-5 and SA9149AC-6) to service
ports. Drain compressor oil from high-side port first and then low-
side port. Rotate compressor clutch plate in both directions to remove
oil from compressor. Measure oil amount drained, and discard oil.
2) New compressors are shipped with 5 ounces of refrigerant
oil and nitrogen gas. Open compressor sealing plugs slowly to release
nitrogen gas. Drain and measure oil into a clean container (this oil
will be used in new compressor).
3) Ensure amount of refrigerant oil in replacement compressor
is the same as amount removed from old compressor plus amount removed
during refrigerant recovery. This represents total system capacity,
minus amount retained in components that have not been replaced. See
ZEXEL COMPONENT REFRIGERANT OIL CAPACITIES table. Install compressor.
Evacuate, charge and leak test A/C system. Ensure A/C system operates
properly.
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