1999 DODGE RAM refrigerant type
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system. If A/C specification label and specifications in this
article differ, use underhood label specifications.
REFRIGERANT OIL & R-134a REFRIGERANT CAPACITY (CARS)
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Application ( 1) Oil Oz. Refrigerant Oz.
Chrysler Corp.
Avenger & Sebring Coupe
2.0L (DOHC) ...................... 2.7-4.1 ......... 24.7-26.1\
2.5L (SOHC) ...................... 5.7-6.4 ......... 24.7-26.1\
Breeze, Cirrus & Stratus ............. 5.0 ................ 20.0
Concorde, Intrepid, LHS & 300M ....... 5.0 ................ 28.0
Neon ................................. 6.8 ................ 28.0
Sebring Convertible .................. 5.0 ................ 20.0
Ford Motor Co.
Continental .......................... 7.0 ................ 34.0
Contour, Cougar & Mystique ........... ( 1) ................. ( 1)
Crown Victoria & Grand Marquis ....... 7.0 ................ 38.0
Escort, Coupe & Tracer ............... 7.0 ................ 28.0
Mustang .............................. 7.0 ................ 34.0
Sable & Taurus ....................... 7.0 ................ 34.0
Town Car ............................. 7.0 ................ 38.0
General Motors
"C" Body ............................. 9.0 ................ 32.0
"E" & "K" Bodies ................ ( 1) 8.0-9.0 ............. 32.0
"F" Body ............................. 9.0 ................ 24.0
"G" Body
With HD6/HT6 Compressor ............ 8.0 ................ 32.0
With V5 Compressor ................. 9.0 ................ 32.0
"H" Body ............................. 9.0 ................ 32.0
"J" Body ............................. 9.0 ................ 24.0
"M" Body ............................. 3.4 ........... 19.0-21.0
"N" Body ............................. 9.0 ................. ( 2)
"S" Body ......................... ( 3) 4.1 ........... 22.9-26.5
"V" Body ............................. 9.0 ................ 33.5
"W" Body ............................. 9.0 ................ 30.0
"Y" Body ............................. 9.0 ................ 24.0
"Z" Body ............................. 5.0 ................ 24.0
( 1) - Total system capacity, unless otherwise noted. Refer to
underhood A/C specification label in engine compartment for
specified oil type.
( 2) - Refrigerant capacity for Alero and Grand Am is 36.0 ounces.
Refrigerant capacity for Cutlass and Malibu is 28.0 ounces.
( 3) - Compressor oil capacity.
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REFRIGERANT OIL & R-134a REFRIGERANT CAPACITY (LIGHT TRUCKS & VANS) \
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Application ( 1) Oil Oz. Refrigerant Oz.
Chrysler Corp.
Caravan, Town & Country, & Voyager
Without Rear Unit ................... 9.0 ............... 34.0
With Rear Unit ..................... 13.4 ............... 44.0
Dakota ................................ 8.1 ............... 28.0
Durango
Without Rear Unit ................... 5.5 ............... 28.0
With Rear Unit ...................... 8.0 ............... 30.0
Ram Pickup ............................ 8.1 ............... 30.0
Ram Van/Wagon
Without Rear Unit ................... 8.0 ............... 34.0
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With Rear Unit ..................... 10.0 ............... 46.0
Ford Motor Co.
"E" Series
With Rear Unit ..................... 13.0 ............... 64.0
Without Rear Unit ................... 9.0 ............... 44.0
Expedition & Navigator ................ (2) ................ ( 2)
Explorer & Mountaineer ................ 7.0 ............... 30.0
F150/F250 Pickup ...................... 9.0 ............... 32.0
F250HD/F350 Pickup .................... 9.0 ............... 32.0
Ranger ................................ 7.0 ............... 30.0
Villager
With Rear Unit ..................... 11.0 ............... 56.0
Without Rear Unit ................... 7.0 ............... 32.0
Windstar
With Rear Unit ..................... 13.0 ............... 56.0
Without Rear Unit ................... 9.0 ............... 44.0
General Motors
"C" & "K" Series
Pickup & Sierra ..................... 8.0 ............... 32.0
Crew Cab & Utility .................. 8.0 ............... 36.0
Suburban, Tahoe & Yukon
With Rear Unit ..................... 11.0 ............... 64.0
Without Rear Unit ................... 8.0 ............... 36.0
"G" Series
With Rear Unit ..................... 11.0 ............... 78.0
Without Rear Unit ................... 8.0 ............... 48.0
"J" Series ............................ 3.4 ............... 21.0
"L" & "M" Series
With Rear Unit ..................... 11.0 ............... 48.0
Without Rear Unit ................... 8.0 ............... 32.0
"P" Series ............................ 8.0 ................ ( 2)
"S" & "T" Series
2.2L ................................ 9.0 .......... 30.0-32.0
4.3L ................................ 8.0 .......... 30.0-32.0
"U" Series
With Rear Unit ..................... 11.0 ............... 46.0
Without Rear Unit ................... 8.0 ............... 32.0
Jeep
Cherokee .............................. 8.1 ............... 20.0
Grand Cherokee ........................ 5.8 ............... 24.0
Wrangler .............................. 8.1 ............... 20.0
( 1) - Total system capacity, unless otherwise noted. Refer to
underhood A/C specification label in engine compartment for
specified oil type.
( 2) - Refrigerant oil and/or refrigerant capacity not available from
manufacturer. Refer to underhood A/C specification label in
engine compartment.
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REFRIGERANT OILS
* PLEASE READ THIS FIRST *
NOTE: Use ONLY the specified oil for the A/C system or compressor.
Always check the underhood A/C specification label or A/C
compressor label before adding refrigerant oil to A/C
compressor/system.
NOTE: For compressor applications, see COMPRESSOR APPLICATIONS &
BODY DESIGNATIONS. DO NOT exceed A/C system refrigerant oil
capacity when servicing system. See CAPACITIES.
Page 65 of 1691
Bracket broken, affecting
performance ............ A ............ Require replacement.
Bracket broken, not
affecting performance .. .. ........ No service suggested or
required.
Bracket corroded,
affecting performance .. A .. Require repair or replacement.
Bracket corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Bracket cracked, affecting
performance ............ A .. Require repair or replacement.
Bracket cracked, not
affecting performance .. 1 .. Suggest repair or replacement.
Bracket holes elongated,
affecting performance .. A .. Require repair or replacement.
Bracket holes elongated,
not affecting
performance ............ .. ........ No service suggested or
required.
Bracket loose, affecting
performance ............ A .. Require repair or replacement.
Bracket loose, not
affecting performance .. 1 .. Suggest repair or replacement.
Bracket missing ......... C ............ Require replacement.
Housing broken, affecting
performance ............ A .. Require repair or replacement.
Housing broken, not
affecting performance .. .. ........ No service suggested or
required.
Housing cracked, affecting
performance ............ A .. Require repair or replacement.
Housing cracked, not
affecting performance .. 1 .. Suggest repair or replacement.
Inoperative ............. A ........... (1) Require repair or
replacement.
Leaking ................. A .. Require repair or replacement.
Noisy ................... 2 ........... ( 2) Suggest repair or
replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
Tubing connection
leaking ................ A .. Require repair or replacement.
( 1) - Inoperative includes intermittent operation or out of
OEM specification.
( 2) - Compressor noise can also be caused by low oil level,
state of charge, air contamination, or type of
refrigerant.
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CONDENSER AIR SEALS
CONDENSER AIR SEAL INSPECTION \
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Condition Code Procedure
Leaking ................. A . Require repair or replacement.
Missing ................. C ........... Require replacement.
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CONDENSER FAN MOTORS
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missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A ... Require repair or replacement
of hardware.
Contaminated, affecting
performance ............ A ............ Require replacement.
Dessicant bag
deteriorated ........... A ........ (1) Require replacement.
Further inspection required.
Dessicant at the end of
its useful life (saturated
with moisture) ......... 1 .. Suggest repair or replacement.
Fusible plug leaking .... A .... Require replacement of plug.
Leaking ................. A ............ Require replacement.
Pressure relief device
leaking ................ A . Require replacement of pressure
relief device.
Restricted .............. A .. Require repair or replacement.
Sight glass no longer
transparent ............ 2 ... Suggest replacement of drier.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
Tubing connection
leaking ................ A .. Require repair or replacement.
( 1) - Inspect system to determine effects of dessicant bag
deterioration.
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REFRIGERANT
NOTE: Refrigerants include any SNAP (Significant New Alternative
Policy)-approved blends.
REFRIGERANT INSPECTION
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Condition Code Procedure
Contaminated (other than
refrigerant blends) .... B ........ Require service to remove
contamination.
Different types of
refrigerants in the same
system (other than
refrigerant blends) .... B ................. Require repair.
Overcharged ............. B ................. Require repair.
Refrigerant type
does not match
fittings and label ..... B ................. Require repair.
Undercharged ............ B ................. Require repair.
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REFRIGERANT OIL
REFRIGERANT OIL INSPECTION \
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Condition Code Procedure
Contaminated ............ 1 .. Require repair or replacement.
Overfilled .............. B ................. Require repair.
Page 84 of 1691
![DODGE RAM 1999 Service Repair Manual SERVICE PORT INSPECTION \
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Condition Code](/manual-img/12/56915/w960_56915-83.png "DODGE RAM 1999 Service Repair Manual SERVICE PORT INSPECTION \
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Condition Code")
SERVICE PORT INSPECTION \
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Condition Code Procedure
Application
does not match
refrigerant type ....... B ............ Require replacement.
Leaking ................. A .. Require repair or replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
Valve cap leaking ....... A ... Require repair or replacement
of cap.
Valve cap missing ....... C .... Require replacement of valve
cap.
Valve core sticking ..... B .. Require repair or replacement.
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SPRING LOCK COUPLINGS
SPRING LOCK COUPLING INSPECTION \
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Condition Code Procedure
Leaking ................. A ........... ( 1) Require repair or
replacement.
( 1) - Require inspection of mating and sealing surface and
repair or replace as necessary.
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SUCTION THROTTLING VALVES (STVS)
SUCTION THROTTLING VALVE (STV) INSPECTION \
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Condition Code Procedure
Connection damaged ...... B .. Require repair or replacement.
Fitting damaged ......... B .. Require repair or replacement.
Inoperative ............. A ........... ( 1) Require repair or
replacement.
Leaking ................. A .. Require repair or replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
( 1) - Inoperative includes intermittent operation or out of
OEM specification.
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SWITCHES (ELECTRICAL)
SWITCH (ELECTRICAL) INSPECTION \
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Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Page 92 of 1691
A/C -H EA TE R S YSTE M
1999 D odge P ic ku p R 1500
1999 MANUAL A/C-HEATER SYSTEMS
CHRYSLER
Dakota, Durango & Ram Pickup
SPECIFICATIONS
SPECIFICATIONS \
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Application Specification
Compressor Type .............................. Sanden SD-7H15 7-Cyl.
Compressor Belt Tension ........................................ ( 1)
Refrigerant (R-134a) Capacity
With Rear A/C Unit ....................................... 30 ozs.
Without Rear A/C Unit .................................... 28 ozs.
System Oil Capacity
Dakota & Ram Pickup ................................. ( 2) 8.1 ozs.
Durango
With Rear A/C Unit ................................. ( 2) 8.0 ozs.
Without Rear A/C Unit .............................. ( 2) 5.5 ozs.
System Operating Pressures ( 3)
High Side ......................... 190-220 psi (13.4-15.5 kg/cm
)
Low Side .............................. 32-40 psi (2.2-2.8 kg/cm)
( 1) - Dynamic tensioner automatically adjusts belt. Tension is okay if
indicator is within marked limits on belt tensioner.
( 2) - Use SP-20 PAG refrigerant oil.
( 3) - Measured at ambient air temperature of 80
F (27C). \
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WARNING: To avoid injury from accidental air bag deployment, read and
carefully follow all SERVICE PRECAUTIONS and DISABLING &
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG SYSTEM SAFETY
article.
CAUTION: When battery is disconnected, radio will go into anti-theft
protection mode. Obtain radio anti-theft protection code from
owner prior to servicing vehicle.
DESCRIPTION
These systems are a blend-air type. Outside air enters
through a cowl at base of the windshield and flows through a plenum
chamber into blower housing. Airflow velocity is controlled by blower
speed selector switch. Air flows across evaporator and is directed by
a blend-air door to go either through or by-pass the heater core.
On Dakota and Durango, temperature control cable operates
blend-air door and allows immediate control of outlet air temperature.
It also controls operation of recirculation door. On Ram Pickup,
temperature is regulated by a blend-air servo motor controlled from
A/C-heater control panel rotary temperature dial. On all models, mode
selector switch controls vacuum-operated doors to direct conditioned
air to selected outlets.
Durango may also be equipped with an optional rear A/C unit.
The rear A/C unit consists of a blower motor and evaporator. It will
only operate while the front A/C is on. The optional rear A/C-heater
unit is controlled using fan and temperature switches.
Page 93 of 1691
OPERATION
CONTROL PANEL
Blower Motor Switch
Fan speed is controlled with a rotary switch. On front A/C-
heater systems, there are 4 different fan speed settings. Low, medium-
low, medium-high, and high. On rear A/C-heater systems, there are 3
different fan speed settings. Low, medium, and high.
Mode Control Knob
Mode rotary switch is used to change direction of air flow.
There are 7 different modes of operation: recirculation, panel with
A/C, floor/panel, panel without A/C (vent), floor, floor/defrost, and
defrost.
Temperature Control Knob
Temperature rotary switch controls temperature blend/air door
position by a cable on Dakota and Durango, and by vacuum actuator for
Ram Pickup. When cold temperature is selected, no air flows across
heater core. When hot temperature is selected, all air flows through
heater core. Temperature may vary by any setting between cold and hot.
CLUTCH CYCLING PRESSURE SWITCH
Dakota & Ram Pickup
Clutch cycling low pressure switch is mounted on a Schrader-
type valve fitting that is part of the accumulator. It is connected in
series with the high pressure cut-off switch and control panel,
between ground and PCM. Switch contacts open and close due to changes
in A/C system pressure. Opening and closing of switches will cause PCM
to turn compressor clutch on and off, regulating system pressure which
controls temperature of evaporator.
Clutch cycling low pressure switch contacts are normally open
when suction (low side) pressure drops below 25 psi (1.8 kg/cm
) on
Ram Pickup; 20.5 psi (1.4 kg/cm) on Dakota. Extreme cold weather will
also open contacts. When contacts are open, PCM will de-energize
compressor clutch relay, disengaging compressor clutch.
Clutch cycling pressure switch contacts will close when
suction (low side) pressure rises above 43 psi (3.0 kg/cm
) on Ram
Pickup or 36 psi (2.5 kg/cm) on Dakota. When contacts are closed, PCM
will energize compressor clutch relay, engaging compressor clutch.
ELECTRONIC CYCLING CLUTCH SWITCH
Durango
The electronic cycling clutch switch is mounted to Thermal
Expansion Valve (TXV), also referred to as an "H" valve, in engine
compartment. It provides evaporator temperature to the PCM. Using this
information, the PCM will cycle the compressor clutch to prevent
evaporator icing. The switch is used for the front evaporator only.
Electronic cycling clutch switch is connected in series with
mode control switch, high pressure cut-out switch, low pressure cut-
out switch, and PCM. The electronic cycling clutch switch opens when
refrigerant temperature is below about 37
F (2.8C) and will close
when refrigerant temperature is about 40F (4.4C).
FIXED ORIFICE TUBE
Dakota & Ram Pickup
The fixed orifice tube is located in outlet line of the
condenser. The orifice tube inlet and outlet ends have a screen to
Page 130 of 1691
of underhood labels with R-134a refrigerant clearly printed on labels.
See Fig. 2 . The underhood label used on Ford Motor Co. vehicles is
Yellow. See Fig. 3. Most manufacturers will identify refrigerant type
with labels affixed to compressor. Before servicing an A/C system,
always determine which refrigerant is being used.
Fig. 2: Underhood Refrigerant Identification Labels (Typical)
Courtesy of chrysler corp.
Fig. 3: Underhood Refrigerant Identification Label (Typical)
Courtesy of ford motor co.
REFRIGERANT OILS