1999 DODGE RAM light


A/C C O M PR ESSO R S ER VIC IN G
1999 D odge P ic ku p R 1500
1999 GENERAL SERVICING
A/C Compressor Servicing
All Models
* PLEASE READ THIS FIRST *
NOTE: Always refer to underhood A/C specification label in engine
compartment or A/C compressor label while servicing A/C
system. If A/C specification label and A/C COMPRESSOR
SERVICING article specifications differ, use underhood label
specifications.
BODY DESIGNATIONS
BODY DESIGNATIONS (CHRYSLER CORP. CARS)








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Model ( 1) Body Designation
Avenger & Sebring Coupe ................................ "FJ22" Body
Breeze, Cirrus & Stratus ................................. "JA" Body
Concorde, Intrepid, LHS & 300M ........................... "LH" Body
Neon ..................................................... "PL" Body
Sebring Convertible ...................................... "JX" Body
( 1) - Body codes are determined by fifth character of VIN code.









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BODY DESIGNATIONS (CHRYSLER CORP. LIGHT TRUCKS & VANS)








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Model Body Designation
Caravan, Town & Country, & Voyager ..................... "NS" Series
Dakota ................................................. "AN" Series
Durango ................................................ "DN" Series
Ram Pickup .......................................... "BR/BE" Series
Ram Van/Wagon .......................................... "AB" Series









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BODY DESIGNATIONS (FORD MOTOR CO. LIGHT TRUCKS & VANS)








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Model Body Designation
Explorer & Mountaineer .................................. "U" Series
Pickup .................................................. "F" Series
Ranger .................................................. "R" Series
Van ..................................................... "E" Series









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BODY DESIGNATIONS (GENERAL MOTORS CARS)








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Model ( 1) Body Designation
Alero, Cutlass, Grand Am & Malibu ......................... "N" Body
Aurora & Riviera .......................................... "G" Body
Bonneville, Eighty Eight, LeSabre & LSS ................... "H" Body
Camaro & Firebird ......................................... "F" Body
Catera .................................................... "V" Body
Cavalier & Sunfire ........................................ "J" Body

Century, Grand Prix, Intrigue, Lumina, Monte Carlo &
Regal .................................................... "W" Body
DeVille & Seville ......................................... "K" Body
Corvette .................................................. "Y" Body
Eldorado .................................................. "E" Body
Metro ..................................................... "M" Body
Park Avenue ............................................... "C" Body
Prizm ..................................................... "S" Body
Saturn .................................................... "Z" Body
(1) - Body codes are determined by fourth character of VIN code.









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BODY DESIGNATIONS (GENERAL MOTORS LIGHT TRUCKS & VANS)








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Model ( 1) Body Designation
Astro & Safari
2WD ................................................... "M" Series
4WD ................................................... "L" Series
Blazer, Bravada, Envoy, Jimmy, Pickup & Sonoma
2WD ................................................... "S" Series
4WD ................................................... "T" Series
Commercial Chassis & Motorhome .......................... "P" Series
Escalade, Pickup, Sierra, Silverado, Suburban, Tahoe & Yukon
2WD ................................................... "C" Series
4WD ................................................... "K" Series
Express & Savana ........................................ "G" Series
Tracker ................................................. "J" Series
Montana, Silhouette & Venture ........................... "U" Series
( 1) - Series codes are determined by fifth character of VIN code.









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BODY DESIGNATIONS (JEEP LIGHT TRUCKS)








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Model ( 1) Body Designation
Cherokee ............................................... "XJ" Series
Grand Cherokee ......................................... "WJ" Series
Wrangler ............................................... "TJ" Series
( 1) - Series codes are determined by fifth character of VIN code.









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COMPRESSOR APPLICATIONS
COMPRESSOR APPLICATIONS (CARS)








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Application Compressor
Chrysler Corp.
Avenger & Sebring Coupe
2.0L (DOHC) ........................ Nippondenso 10PA17C 10-Cyl.\
2.5L (SOHC) .............................. Sanden MSC90-C Scroll\
Breeze, Cirrus & Stratus .................... Sanden TRS-90 Scroll
Concorde, Intrepid, LHS & 300M ........ Nippondenso 10PA17 10-Cyl.
Neon .................................. Nippondenso 10PA17 10-Cyl.
Sebring Convertible ......................... Sanden TRS-90 Scroll
Ford Motor Co.
Except Taurus 3.4L SHO ........................ Ford FS-10 10-Cyl.
Taurus 3.4L SHO .................................... Sanden Scroll

General Motors (1)
"C" Body ...................................... Harrison V5 5-Cyl.
"E" Body ................................. Harrison HD6/HT6 6-Cyl.
"F" Body
3.8L Engine ................................. Harrison V5 5-Cyl.
5.7L Engine ................................. Harrison V7 7-Cyl.
"G" Body
Aurora ................................. Harrison HD6/HT6 6-Cyl.
Riviera ..................................... Harrison V5 5-Cyl.
"H" Body ...................................... Harrison V5 5-Cyl.
"J" Body ...................................... Harrison V5 5-Cyl.
"K" Body ................................. Harrison HD6/HT6 6-Cyl.
"M" Body ..................................... Nippondenso 10-Cyl.
"N" Body ...................................... Harrison V5 5-Cyl.
"S" Body ...................................... Harrison V5 5-Cyl.
"V" Body ...................................... Harrison V5 5-Cyl.
"W" Body ...................................... Harrison V5 5-Cyl.
"Y" Body ...................................... Harrison V7 7-Cyl.
"Z" Body ....................................... Zexel Rotary Vane
( 1) - Body codes are determined by fourth character of VIN code.









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COMPRESSOR APPLICATIONS (LIGHT TRUCKS & VANS)








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Application Compressor
Chrysler Corp.
Dakota & Ram Pickup ........................ Sanden SD-7H15 7-Cyl.
Durango .................................... Sanden SD-7H15 7-Cyl.
Caravan, Town & Country, & Voyager .... Nippondenso 10PA17 10-Cyl.
Ram Van/Wagon ............................... Sanden TR-105 Scroll
Ford Motor Co.
"E" Series Van ................................ Ford FS-10 10-Cyl.
Expedition & Navigator ........................ Ford FS-10 10-Cyl.
Explorer & Mountaineer ........................ Ford FS-10 10-Cyl.
"F" Series Pickup
Except Super Duty ........................... Ford FS-10 10-Cyl.
Super Duty ............................... Sanden SD-7H15 7 Cyl.
Ranger ........................................ Ford FS-10 10-Cyl.
Villager ........................................... FS-10 10-Cyl.
Windstar ...................................... Ford FS-10 10-Cyl.
General Motors ( 1)
"C" & "K" Series ......................... Harrison HD6/HT6 6-Cyl.
"G" Series .................................... Harrison V5 5-Cyl.
"J" Series ................................... Nippondenso 10-Cyl.
"L" & "M" Series ......................... Harrison HD6/HT6 6-Cyl.
"P" Series ............................... Harrison HD6/HT6 6-Cyl.
"S" & "T" Series
2.2L ........................................ Harrison V7 7-Cyl.
4.3L ................................... Harrison HD6/HT6 6-Cyl.
"U" Series .................................... Harrison V5 5-Cyl.
Jeep
Cherokee ................................... Sanden SD-7H15 7-Cyl.
Grand Cherokee ........................ Nippondenso 10PA17 10-Cyl.
Wrangler ................................... Sanden SD-7H15 7-Cyl.
( 1) - Series codes are determined by fifth character of VIN code.









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FORD FS-10 10-CYLINDER

Installation (Cherokee & Wrangler)
1) Install clutch coil and clutch coil snap ring. Install
clutch coil wire harness to compressor housing. Align pulley and
bearing assembly on front compressor housing hub. Using Installer (C-
6871), press pulley and bearing assembly onto compressor housing hub.
Thread installer on compressor shaft and tighten nut until pulley
assembly is seated.
2) Install external front snap ring with beveled side facing
outward. Ensure snap ring is properly seated. Install compressor shaft
key and original shims. Using a plastic mallet and Driver (C-6463),
install clutch plate on compressor shaft. Tighten compressor shaft nut
to 10 ft. lbs. (14 N.m).
3) Using feeler gauge, measure air gap between clutch plate
and pulley assembly in several areas. Air gap should be 0.016-0.031"
(0.41-0.79 mm). If air gap is not within specification, adjust shim
thickness as necessary. If air gap is not consistent around clutch
plate, lightly pry up or tap down on clutch plate to make corrections.
To complete installation, reverse removal procedure.
Installation (Dakota, Durango & Ram Pickup)
1) Install clutch coil and clutch coil snap ring. Install
clutch coil wire harness to compressor housing. Align pulley and
bearing assembly on front compressor housing hub.
2) Install Handle (6464) and Driver (6143) into pulley
assembly bearing cavity. Ensure outer edge of driver rests firmly on
inner race of bearing. Using hammer, install pulley and bearing
assembly. While tapping on handle, guide pulley and bearing assembly
to prevent binding. Ensure pulley assembly bottoms against compressor
housing. Install external snap ring.
3) Install original shim(s) and compressor shaft key. Use a
hammer and Shaft Protector (6141-2) to install clutch plate on
compressor shaft. Ensure clutch plate bottoms out on clutch shims.
Replace compressor shaft nut and tighten compressor shaft nut to 10
ft. lbs. (14 N.m).
4) Measure air gap between clutch plate and pulley assembly
in several areas. Air gap should be 0.016-0.031" (0.41-0.79 mm). If
air gap is not within specification, adjust shim thickness as
necessary. If air gap is not consistent around clutch plate, lightly
pry up or tap down on clutch plate to make corrections. To complete
installation, reverse removal procedure. Ensure A/C system operates
properly.
5) After completing compressor clutch installation, start
engine. Set A/C-heater control to recirculated air mode and high
blower motor speed. Set engine speed to 1500-2000 RPM. Cycle
compressor on for 5 seconds and off for 5 seconds, about 20 times to
break-in clutch.
Removal (Ford "F" Series Super Duty Pickup)
1) Disconnect and isolate negative battery cable. Discharge
A/C system, using approved refrigerant recovery/recycling equipment.
Disconnect clutch coil harness connector and remove compressor. Drain
oil from compressor, and measure amount drained.
2) Using Spanner Wrench (T70P-4067-A), hold clutch plate and\
remove compressor shaft nut. See Fig. 1. If necessary, use a steering
wheel puller to remove clutch plate and shim(s).
3) Using a flat-blade screwdriver, remove pulley assembly
bearing dust cover. Remove compressor shaft key and internal bearing
snap ring. Remove external front housing snap ring.
4) Install jaws of rotor puller into pulley assembly internal
bearing snap ring groove. Install shaft protector over compressor
shaft. Install puller flange plate on jaws. Install 2 puller bolts
through puller flange plate into jaws and hand tighten. Tighten pulley
center bolt clockwise and remove pulley assembly from compressor.

filter the refrigerant. The orifice tube is used to meter the flow of
liquid refrigerant into the evaporator core.
HIGH PRESSURE CUT-OUT SWITCH
High pressure cut-out switch is located on compressor
discharge line, near compressor. On Dakota and Ram Pickup, it is
connected in series with the clutch cycling pressure switch and
control panel, between ground and PCM.
On Durango, it is connected in series with the electronic
cycling clutch switch, low pressure cut-out switch and control panel,
between ground and PCM. PCM controls compressor clutch operation.
On all models, when discharge pressure reaches 450-490 psi
(31.6-34.5 kg/cm
), high pressure cut-out switch interrupts A/C
request signal to PCM. PCM de-energizes compressor clutch relay,
disengaging compressor clutch. When discharge pressure drops to 270-
330 psi (23.2-19 kg/cm
) switch will close, thus restoring A/C request
signal to PCM.
HIGH PRESSURE RELIEF VALVE
High pressure relief valve is located on compressor manifold.
Valve vents system pressure if pressure is greater than 500-600 psi
(35.1-42.2 kg/cm
). Valve will reset when pressure decreases to 400
psi (28.1 kg/cm).
LOW PRESSURE CUT-OUT SWITCH OPERATION
Durango
Low pressure cut-out switch is located on suction line near
firewall. It is connected in series with the electronic cycling clutch
switch, high pressure cut-out switch and control panel, between ground
and PCM. PCM controls compressor clutch operation.
When discharge pressure reaches 10 psi (.7 kg/cm
), switch
interrupts A/C request signal to PCM. PCM de-energizes compressor
clutch relay, disengaging compressor clutch. When discharge pressure
increases to 13-27 psi (.9-1.9 kg/cm
), switch will close thus
restoring A/C request signal to PCM.
ADJUSTMENTS
TEMPERATURE CONTROL CABLE ADJUSTMENT
Dakota & Durango
1) Ensure temperature control cable housing and core are
connected at both A/C-heater control panel and A/C-heater assembly.
Ensure A/C-heater control panel is installed.
2) Rotate temperature control knob so that knob pointer is at
12 o'clock position. Pull temperature control knob straight out from
A/C-heater control panel until perimeter of knob (not knob pointer)
protrudes about .25" (6 mm) from face of A/C-heater control panel.
3) Rotate temperature control knob clockwise so that knob
pointer is at one o'clock position. Push in on knob slightly and
continue rotating knob to its full clockwise stop. Place knob pointer
at a position about .32" (8 mm) beyond end of Red stripe. Release
knob. If knob is pointing at about .32" (8 mm) beyond end of Red
stripe, go to next step. If knob is not pointing at about .32" (8 mm)
beyond end of Red stripe, go back to step 2) and repeat adjustment
procedure.
4) Rotate temperature control knob counterclockwise so that
knob pointer is at 12 o'clock position. Push temperature control knob
straight into A/C-heater control panel until perimeter of knob (not

knob pointer) is flush with base of A/C-heater control panel.
5) Rotate temperature control knob to its full clockwise
stop. Release knob. Knob pointer should be aimed at end of Red stripe.
If knob is pointed at end of Red stripe, go to next step. If knob is
not pointed at end of Red stripe, go back to step 2) and repeat
adjustment procedure.
6) Rotate temperature control knob to its full
counterclockwise stop. Release knob. If knob springs back, self-
adjuster clip securing temperature control cable to blend-air door
lever is improperly installed. See TEMPERATURE CONTROL CABLE R & I. If
knob does not spring back, temperature control cable adjustment is
complete.
TESTING
* PLEASE READ THIS FIRST *
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.
A/C-HEATER CONTROL PANEL TEST
1) Connect a vacuum gauge in line with Black A/C-heater
vacuum supply hose, located at tee near power brake booster (Dakota)
or in engine compartment (Durango and Ram Pickup). Position gauge so
it can be viewed from passenger compartment.
2) Start engine. While observing gauge, rotate mode control
knob to each mode position (one position at a time). Pause after each
selection. Test gauge should drop, then return to 8 in. Hg shortly
after each selection is made. If gauge reading is as specified, go to
next step. If gauge reading is not as specified, check for vacuum leak
in vacuum lines or A/C-heater control panel.
3) Move temperature control knob quickly to full hot and full
cold positions. A distinct sound of blend-air door hitting its stops
should be heard. No spring-back of knob should exist.
4) If temperature control knob operates as specified,
temperature control system is okay. On Dakota and Durango, if
temperature control knob does not operate as specified, check
condition, routing, installation, and adjustment of temperature
control cable. See TEMPERATURE CONTROL CABLE ADJUSTMENT . Also check
blend air door for proper installation, obstructions, or faulty seals.
A/C SYSTEM PERFORMANCE
1) Park vehicle out of direct sunlight. Ensure ambient
temperature is at least 70F (21C). Connect tachometer and manifold
gauge set to vehicle. Turn A/C on. Turn mode control to panel and
recirculated air positions, temperature control lever to maximum
cooling, and blower to high.
2) Start engine and allow it to run at 1000 RPM, with A/C
compressor clutch engaged. Engine should be at operating temperature
with doors, windows, and hood closed. Insert thermometer into left
center air outlet.
3) Run engine and operate system for 5 minutes. The A/C
compressor clutch may cycle, depending on temperature. If A/C
compressor clutch cycles, stop engine and disconnect negative battery
cable. Remove clutch cycling pressure switch connector. Place a jumper
wire across terminals of clutch cycling pressure switch harness
connector.
4) Connect negative battery cable. Turn A/C on. Start and

control panel and blower motor.
Fig. 3: Identifying Blower Motor Switch Connector Terminals (Typical)\
Courtesy of Chrysler Corp.
Rear (Durango)
1) Disconnect negative battery cable. Remove rear blower
motor switch located in headliner. See BLOWER MOTOR SWITCH (REAR)
under REMOVAL & INSTALLATION. Disconnect rear blower motor switch
connector. Using an ohmmeter, check continuity between rear blower
motor switch connector Black wire and ground. If continuity exists, go
to next step. If continuity does not exist, repair open in Black wire
between rear blower motor switch connector and ground connector
located at left rear of vehicle body.
2) Place blower motor switch knob to any position except OFF.
Using an ohmmeter, check for continuity between rear blower motor
switch connector Black wire and Black/Light Blue wire, and
Black/Orange wire and Dark Green wire while rotating blower motor
switch.
3) If continuity does not exist at any terminal, replace
faulty blower motor switch. If continuity exists as specified, check
for open in circuits between blower motor switch and blower motor
resistor. Also check for an open in circuit between blower motor
switch connector and blower motor relay.
CLUTCH CYCLING PRESSURE SWITCH
Dakota & Ram Pickup
1) Locate clutch cycling pressure switch on side or top of
A/C accumulator. Ensure clutch cycling pressure switch is properly
installed on A/C accumulator fitting. Ensure system pressure is
correct. See A/C SYSTEM PERFORMANCE test.
2) Start and run engine with A/C on. If clutch cycles, turn
engine off and disconnect negative battery cable. Disconnect clutch
cycling pressure switch connector. Place a jumper wire across
terminals of clutch cycling pressure switch harness connector. Connect
negative battery cable. Connect manifold gauge set. Set A/C-heater

controls to A/C. Start and operate engine at idle speed.
3) Using an ohmmeter, check for continuity between switch
terminals. Continuity should exist when suction pressure reading is
above 38 psi (2.7 kg/cm
) on Dakota; 43 psi (3.0 kg/cm) on Ram
Pickup. Continuity should not exist when suction pressure reading
drops below 20.5 psi (1.4 kg/cm
) on Dakota; 25 psi (1.8 kg/cm) on
Ram Pickup. If switch is okay, test and repair clutch control circuit
as needed. If switch is not okay, replace faulty clutch cycling
pressure switch.
ELECTRONIC CYCLING CLUTCH SWITCH
Durango
1) Locate electronic cycling clutch switch on thermal
expansion valve in engine compartment. Ensure system pressure is
correct. See A/C SYSTEM PERFORMANCE test. Ensure low pressure cut-out
switch and high pressure cut-out switch are working properly. See
LOW PRESSURE CUT-OUT SWITCH TEST and HIGH PRESSURE CUT-OUT SWITCH
test.
2) Disconnect negative battery cable. Disconnect electronic
cycling clutch switch and high pressure cut-out switch connectors.
Using an ohmmeter, check for continuity in Light Green/White wire
between electronic cycling clutch switch and high pressure cut-out
switch. If continuity exists in Light Green/White wire, go to next
step. If continuity does not exist in Light Green/White wire, repair
wire as necessary.
3) Disconnect low pressure cut-out switch connector. Using an
ohmmeter, check for continuity in Dark Blue/Yellow wire between
electronic cycling clutch switch and low pressure cut-out switch. If
continuity exists in Dark Blue/Yellow wire, go to next step. If
continuity does not exist in Dark Blue/Yellow wire, repair wire as
necessary.
4) Connect low pressure cut-out switch and high pressure cut-
out switch connectors. Connect negative battery cable. Turn ignition
on. Using voltmeter, check for battery voltage at electronic cycling
clutch switch connector terminal No. 2 (White wire). If battery
voltage exists, go to step 6).
5) If battery voltage does not exist, check fuse No. 7 (15-
amp) at junction block located at bottom left of instrument panel. If
fuse is okay, check for short or open in White wire between electronic
cycling clutch switch connector and fuse No. 7 (15-amp) at junction
block.
6) Connect electronic cycling clutch switch connector. Ensure
ambient temperature is between 68-90
F (20-30C). Start engine and
turn A/C on. If compressor clutch cycles 2-3 times per minute, replace
faulty electronic cycling clutch switch. If compressor clutch does not
cycle, check PCM for proper operation. See appropriate G - TESTS
W/CODES article in ENGINE PERFORMANCE section.
HIGH PRESSURE CUT-OUT SWITCH
1) Locate high pressure cut-out switch on compressor
discharge line, near compressor. Ensure system pressure is correct.
See A/C SYSTEM PERFORMANCE test. Disconnect negative battery cable.
Disconnect high pressure cut-off switch connector.
2) Using an ohmmeter, check for continuity between switch
terminals. If continuity exists, test and repair clutch control
circuit as needed. If continuity does not exist, replace faulty
switch.
LOW PRESSURE CUT-OUT SWITCH TEST
Durango