bulb JEEP CHEROKEE 1988 Service Repair Manual
[x] Cancel search | Manufacturer: JEEP, Model Year: 1988, Model line: CHEROKEE, Model: JEEP CHEROKEE 1988Pages: 1378, PDF Size: 19.9 MB
Page 159 of 1378
* Expansion Dry Frosty-Check for moisture or
Valve restriction. Check sensing
bulb.
* STV Dry and cool to Frosty or warm-Check gauge
touch. readings for valve malfunction
* Evaporator Dry and cold to Freezing or warm-Check
touch. expansion valve, STV or thermo
switch.
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Gauge Readings Gauge Readings are
* High Side See Pressure Above or below normal-See A/C
Gauge Chart Diagnosis on next page.
* Low Side See Pressure Above or below normal-See A/C
Gauge Chart Diagnosis on next page.
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Fig. 1: AMBIENT TEMPERATURE/PRESSURE
Page 161 of 1378
Discharge air warm when low
side gauge drops into vacuum.
Normal Normal Thermostatic switch system Defective Thermo-
only-compressor cycles off static Switch
and on too rapidly.
Normal Normal Cycling clutch systems Misadjusted Thermo-
only-Compressor doesn't static Switch or
turn on soon enough. or Defective
Discharge air becomes Pressure Sensing
warm as low side pressure Switch
rises.
Low Low Bubbles in sight glass. Low R-12 Charge
Outlet air slightly cool.
Low Low Sight glass clear or oil- Excessively Low
streaked. Outlet air very R-12 Charge
warm.
Low Low Outlet air slightly cool. Expansion Valve
Sweating or frost at Stuck Closed.
at expansion valve. Screen Plugged or
Sensing Bulb
Malfunction.
Low Low Outlet air slightly Restriction on High
cool. High side line Side
cool to touch. Sweating
or frost on high side.
Low High Evaporator outlet pipe STV Stuck Open
cold. Low side goes
into vacuum when blower
is disconnected.
High Low Evaporator outlet pipe STV Stuck Open
warm. Outlet air warm.
High Low Noise from compressor. Compressor
Malfunction
High High Outlet air warm. Liquid Condenser
line very hot. Bubbles Malfunction or R-12
in sight glass. Overcharge.
High High Outlet air slightly cool. Large Amount of Air
Bubbles in sight glass. and Moisture in
System.
High High Outlet air warm. Expansion Valve
Evaporator outlet Stuck Open
sweating and frost.
(1) - If equipped with a low refrigerant charge protection system,
compressor operation may have stopped.
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Page 171 of 1378
* Switch to LOW
blower.
* Close doors. Too warm - Check control
lever operation, heater
water valve, cooling
system and gauge readings.
* Check outlet
temperature. 35-45
F (1.7-7.2 C)\
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Visual Check Visual Check Shows:
* Compressor Quiet, No Leaks Noisy - Check belts, oil
level, seals, gaskets,
reed valves.
* Condenser Free of Obstructions Blocked - Clean off.
Plugged - Flush or
replace.
* Receiver-Drier Dry and warm to Frosty - Check for re-
touch striction, replace
Desicant.
* Sight Glass Clear or few bubbles Bubbly, foamy or streaks -
Check gauge readings.
* High Side Lines Dry and warm to Frosty or very hot - Check
touch for restriction or
overcharge.
* Low Side Lines Dry and cool to Frosty or warm - Check for
touch restriction, low charge or
bad valve.
* Expansion Valve Dry Frosty - Check for moisture
or restriction. Check
sensing bulb.
* STV Dry and cool to Frosty or warm - Check
touch gauge readings for valve
malfunction.
* Evaporator Dry and cold to Freezing or warm - Check
touch expansion valve, STV or
thermo switch.
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Gauge Readings Gauge Readings are:
* High Side Gauge See Pressure Chart Above or below normal - See
A/C DIAGNOSIS.
* Low Side Gauge See Pressure Chart Above or below normal - See
A/C DIAGNOSIS.
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PRESSURE CHARTS
Page 174 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual Tiny bubbles in sight
glass. Discharge air warm
when low side gauge drops
into vacuum.
\](/img/16/57037/w960_57037-173.png "JEEP CHEROKEE 1988 Service Repair Manual Tiny bubbles in sight
glass. Discharge air warm
when low side gauge drops
into vacuum.
\")
Tiny bubbles in sight
glass. Discharge air warm
when low side gauge drops
into vacuum.
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Normal Normal Thermostatic switch system Defective Thermo-
only-compressor cycles off static Switch
and on too rapidly.
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Normal Normal Cycling clutch systems Misadjusted Thermo
to High only-Compressor doesn't static Switch or
turn on soon enough. Defective Pressure
Discharge air becomes Sensing Switch
warm as low side
pressure rises.
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Low Low Bubbles in sight glass. Low R-12 Charge
Outlet air slightly cool.
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Low Low Sight glass clear or oil- Excessively Low
streaked. Outlet air very R-12 Charge
warm.
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Low Low Outlet air slightly cool. Expansion Valve
Sweating or frost at Stuck Closed.
expansion valve. Screen Plugged or
Sensing Bulb
Malfunction
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Low Low Outlet air slightly cool. Restriction on
High side line cool to High Side.
touch. Sweating or frost
on high side.
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Low High Evaporator outlet pipe STV Stuck Open
cold. Low side goes into
vacuum when blower is
disconnected.
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High Low Evaporator outlet pipe STV Stuck Open
warm. Outlet air warm.
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High Low Noise from compressor Compressor
Malfunction
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High High Outlet air warm. Condenser
Liquid line very hot. Malfunction or
Bubbles in sight glass. R-12 Overcharge
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High High Outlet air slightly cool. Large Amount of
Bubbles in sight glass. Air and Moisture
in System.
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High High Outlet air warm. Expansion Valve
Evaporator outlet Stuck Open.
sweating and frost.
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(1) - If equipped with a low refrigerant charge protection system,
compressor operation may have stopped.
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A/C SYSTEM SERVICE SPECIFICATIONS
Page 282 of 1378
\003
* B RAK E S YSTE M U NIF O RM IN SPEC TIO N G UID ELIN ES *
1 988 J e ep C hero ke e
GENERAL INFORMATION
Brake Systems - Motorist Assurance Program
Standards For Automotive Repair
All Makes & Models
CONTENTS
OVERVIEW OF MOTORIST ASSURANCE PROGRAM
OVERVIEW OF SERVICE REQUIREMENTS AND SUGGESTIONS
ACCELEROMETERS (G SENSOR OR LATERAL)
ACCUMULATORS
ANCHOR PINS
ANTI-LOCK BRAKE SYSTEMS
BACKING PLATES
BRAKE FLUID
BRAKE FRICTION MATERIAL
BRAKE PADS
BRAKE PEDALS
BRAKE SHOES
BRAKE SHOE HARDWARE
BRAKE STOPLIGHT SWITCHES
BULB SOCKETS
BULBS AND LEDS
CALIPER HARDWARE
CALIPERS
CONTROLLERS
DIGITAL RATIO AXLE CONTROLLERS AND BUFFERS (DRAC AND DRAB)
DISABLE SWITCHES
DRUMS
ELECTRICAL PUMPS AND MOTORS
ELECTRONIC CONTROLLERS
FLUID
FLUID LEVEL SENSOR SWITCHES
FOUR WHEEL DRIVE SWITCHES
FRICTION MATERIAL
G SENSORS
HOSES
HYDRAULIC MODULATORS
HYDRO-BOOSTERS
HYDRO-ELECTRIC BOOSTERS (POWERMASTER)
IGNITION DISABLE SWITCHES
LATERAL ACCELERATION SWITCHES
LEDS
LENSES
MASTER CYLINDERS
MODULATORS
MOTORS
PARKING BRAKE SWITCHES
PARKING BRAKE SYSTEMS
PADS
PEDAL TRAVEL SWITCHES
PEDALS
POWERMASTER
PUMPS
PRESSURE DIFFERENTIAL SWITCHES
PRESSURE SWITCHES
RELAYS
ROTORS
SELF-ADJUSTING SYSTEMS
Page 289 of 1378
Connector melted ........ A ........ (1) Require replacement.
Connector missing ....... C ............ Require replacement.
Missing ................. C ............ Require replacement.
Out of adjustment ....... B ........... Require adjustment or
replacement.
Output signal incorrect . B ............ Require replacement.
Terminal burned, affecting
performance ............ A .............. ( 2) Require repair
or replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance ... A .. Require repair or replacement.
Terminal corroded, not
affecting performance ... 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance ... 1 .. Suggest repair or replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
( 1) - Determine cause and correct prior to replacement of part.
( 2) - Determine cause and correct prior to repair or replacement
of part.
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BULB SOCKETS
BULB SOCKET 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.
Attaching hardware not
functioning ............ A ... Require repair or replacement
of hardware.
Broken .................. A .. Require repair or replacement.
Bulb seized in socket ... A .. Require repair or replacement.
Burned, affecting
performance ............ A .............. ( 1) Require repair
or replacement.
Burned, not affecting
performance ............ 2 .............. ( 1) Suggest repair
or replacement.
Connector broken ........ A .. Require repair or replacement.
Connector missing ....... C ............ Require replacement.
Connector (Weatherpack
type) leaking .......... A .. Require repair or replacement.
Connector melted ........ A .............. ( 2) Require repair
or replacement.
Corroded, affecting
performance ............ A .. Require repair or replacement.
Corroded, not affecting
performance ............ 2 .. Suggest repair or replacement.
Leaking ................. A .. Require repair or replacement.
Melted .................. A ........ ( 2) Require replacement.
Page 290 of 1378
Shorted ................. A .. Require repair or replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal burned, affecting
performance ............ A .............. (2) Require repair
or replacement.
Terminal burned, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
( 1) - Determine cause and correct prior to repair or
replacement of socket.
( 2) - Determine cause and correct prior to repair or
replacement of part.
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BULBS AND LEDS
NOTE: Copied from Electrical UIGs and modified. Does not
include soldered-in components.
BULB AND LED INSPECTION
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Condition Code Procedure
Application incorrect ... B ........ ( 1) Require replacement.
Base burned, affecting
performance ............ A .............. ( 2) Require repair
or replacement.
Base burned, not affecting
performance ............ 2 .............. ( 2) Suggest repair
or replacement.
Base corroded, affecting
performance ............ A .. Require repair or replacement.
Base corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Base loose, affecting
performance ............ B .. Require repair or replacement.
Base loose, not affecting
performance ............ 1 .. Suggest repair or replacement.
Burned out .............. A ............ Require replacement.
Intermittent ............ A ............ Require replacement.
Missing ................. C ............ Require replacement.
Seized in socket ........ A .. Require repair or replacement.
Terminal broken ......... A .. Require repair or replacement.
Terminal burned, affecting
performance ............ A .............. ( 2) Require repair
or replacement.
Terminal burned, not
affecting performance .. 2 .............. ( 2) Suggest repair
or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.
Terminal loose, affecting
performance ............ B .. Require repair or replacement.
Page 291 of 1378
Terminal loose, not
affecting performance .. 1 .. Suggest repair or replacement.
(1) - Application incorrect includes wrong bulb coating
or color.
( 2) - Determine cause and correct prior to repair or
replacement of part.
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CALIPER HARDWARE
CALIPER HARDWARE INSPECTION \
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Condition Code Procedure
Bent ................... A .. Require repair or replacement.
Broken .................. A .. Require repair or replacement.
Corroded, affecting
performance ............ A .. Require repair or replacement.
Dust boots on slider pin
(bolt) missing ......... C ... Require replacement of boots.
Dust boots on slider pin
(bolt) torn ............ A ... Require replacement of boots.
Missing ................. C ............ Require replacement.
Shim bent ............... A ............. ( 1) Require removal
or replacement.
Shim (OE standard)
missing ................ C ........ ( 2) Require replacement.
Shim out of position .... B ............. ( 1) Require removal
or replacement.
Shim worn ............... A ............. ( 1) Require removal
or replacement.
Slider pin (bolt) bent .. B ... Require replacement of slider
pin or bolt and lubricants.
Slider pin (bolt)
rust-pitted ............ A ... Require replacement of slider
pin or bolt and lubricants.
Slider pin (bolt) worn .. A ... Require replacement of slider
pin or bolt and lubricants.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped (threads
missing) ............... A ............ Require replacement.
Worn, affecting
performance ............ A ............ Require replacement.
( 1) - Removal is acceptable if shim is not OE.
( 2) - Aftermarket shims may be suggested to reduce noise.
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CALIPERS
You are not required to replace or rebuild calipers in axle
sets. However, when replacing or rebuilding a caliper due to the
conditions that follow, you may suggest servicing, rebuilding, or
replacement of the other caliper (on the same axle) for improved
performance and preventive maintenance (for example, the part is close
to the end of its useful life, replacing the caliper may extend pad
life, or contribute to more balanced braking).
CAUTION: When installing loaded calipers, it is required that
friction material be matched in axle sets for consistent
braking characteristics.
Page 301 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual LATERAL ACCELERATION SWITCHES
See ACCELEROMETERS .
LEDS
See BULBS AND LEDS .
LENSES
LENSE INSPECTION \
\](/img/16/57037/w960_57037-300.png "JEEP CHEROKEE 1988 Service Repair Manual LATERAL ACCELERATION SWITCHES
See ACCELEROMETERS .
LEDS
See BULBS AND LEDS .
LENSES
LENSE INSPECTION \
\")
LATERAL ACCELERATION SWITCHES
See ACCELEROMETERS .
LEDS
See BULBS AND LEDS .
LENSES
LENSE INSPECTION \
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Condition Code Procedure
Application incorrect ... A ............ Require replacement.
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A ... Require repair or replacement
of hardware.
Broken, affecting
performance ............ A ............ Require replacement.
Broken, not affecting
performance ............ .. ........ No service suggested or
required.
Cracked ................. A ............ Require replacement.
Discolored .............. A ............ Require replacement.
Leaking ................. A .. Require repair or replacement.
Melted, affecting
performance ............ A ............ Require replacement.
Melted, not affecting
performance ............ 2 ............ Suggest replacement.
Missing ................. C ............ Require replacement.
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MASTER CYLINDERS
MASTER CYLINDER INSPECTION \
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Condition Code Procedure
Brake fluid leaking from
rear of master cylinder
bore ................... B .. Require repair or replacement.
Brake pedal drops
intermittently ......... A ........... ( 1) Require repair or
replacement.
Fluid level low ......... .. ......... ( 2) Further inspection
required.
Internal valve failure .. A .. Require repair or replacement.
Master cylinder leaking
brake fluid internally . A .. Require repair or replacement.
Piston does not return .. A .. Require repair or replacement.
Ports plugged ........... A .. Require repair or replacement.
Rubber master cylinder
cover gasket distorted
and gummy .............. A .. ( 3) Require replacement of the
gasket.
Page 305 of 1378
reconditioning ......... B ........ (3) Require replacement.
Surface is rust-pitted .. B ....... Require reconditioning or
replacement of rotor according
to OEM specifications.
Surface is scored ....... B ... ( 4) Require reconditioning or
replacement of rotor according
to OEM specifications.
Thickness variation
(parallelism) exceeds OEM
specifications .......... B ....... Require reconditioning or
replacement of rotor according
to OEM specifications.
( 1) - Examples of severe corrosion are: composite plate
separated from friction surfaces and cooling fins
cracked or missing.
( 2) - Only applies to vehicles for which OEM "machine to"
specifications exist. If OEM does not supply "machine
to" specifications, the rotor may be worn to discard
specifications.
( 3) - If OEM does not supply "machine to" specifications,
you may machine to discard specifications.
( 4) - Scoring is defined as grooves or ridges in the friction
contact surface. Some vehicle manufacturers require
machining when scoring exceeds their allowable
specifications.
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SELF-ADJUSTING SYSTEMS
SELF-ADJUSTING SYSTEM INSPECTION \
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Condition Code Procedure
Bent .................... A ... Require repair or replacement
of bent part.
Broken .................. A ... Require repair or replacement
of broken part.
Inoperative ............. A ........... ( 1) Require repair or
replacement of inoperative
parts.
Missing ................. C .......... Require replacement of
missing part.
Star wheel does not turn
freely ................. A .. Require repair or replacement.
( 1) - Inoperative includes intermittent operation.
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SHOE HARDWARE
See BRAKE SHOE HARDWARE .
SHOES
See FRICTION MATERIAL .
SOCKETS
See BULB SOCKETS.
SPEED SENSORS (ELECTRONIC WHEEL AND VEHICLE)