heater ISUZU TROOPER 1998 Service User Guide

00 Ð 20 SERVICE INFORMATION
CERAMIC HEATER
When the fan control knob (fan switch) turns on
with the temperature control knob set to ÒFULL
HOTÓ (full hot switch ÒONÓ), the ceramic heater in
the heater unit turns on and the blow temperature
goes up. When the ceramic heater turns on, FICDstarts to operate at the same time. When either one
of the fan switch, the full hot switch or the thermo
switch (which turns on when the coolant tempera-
ture gets below 80°C (176°F) turns off, the ceramic
heater also turns off.
FL-3
40A
C/HEATER
RELAY;
HEATER A/CECM
(J1-23)
24
13
C-20
10A
A/C
FL-1
80A
MAIN
B-18B-1
B-36
1
3
X-12
2
4
1
3
X-21
2
4
1
2
1
2
4
13
24
1
1
2CERAMIC
HEATER
FAN SW.
B-19
B-48
I-18
B-44
B-49
RELAY;
THERMO
SW
RELAY;
CERAMIC
HEATER
DIODE
FULL HOT
SW.
B-1
B-48
1
21
22112
B-49
I-18
213
5 4612
34
B-36X-12X-21
1234
B-44
(RHD)
B-2(LHD)
B-2
D08RWD66

SERVICE INFORMATION 00 Ð 21
CERAMIC HEATER DOES NOT OPERATE
·ARE NO. FL-3 (40A) AND NO. C-20 (10A) OK?
YESNO
REPLACE
REPLACE
REPLACE
REPLACE
·ARE A/C AND CERAMIC HEATER RELAYS OK?
YESNO
·ARE BLOWER MOTOR AND FAN SW. OK?
YESNO
·IS FULL HOT SW. OK?
·DOES TEMP. CONTROL LINK (HEATER UNIT)
OPERATE CORRECTLY?
YESNO
REPLACE·TURN THE IGNITION SW. ÒONÓ (ENGINE IS RUNNING)·CERAMIC HEATER ÒONÓ
·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE CONNECTOR TERMINAL NO. B48-1
YESNO
OPEN CIRCUIT·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE CONNECTOR TERMINAL NO. B48-2
YESNO
CERAMIC HEATER DEFECTIVE·CHECK THE CERAMIC HEATER OR CERAMIC HEATER-
RELATED HARNESS FOR A POOR GROUND AND REPAIR
IT AS NECESSARY
YESNO
·DOES CONTROL LEVER CABLE OPERATE CORRECTLY?·IS THERMO RELAY OK?
YESNO
NOYES
ADJUST OR REPLACEREPAIR OR REPLACE
TEMP. CONTROL UNIT

00 Ð 22 SERVICE INFORMATION
CERAMIC HEATER DOES NOT STOP
WHEN THE IGNITION SW. ÒOFFÓ, DOES CERAMIC HEATER
STOP?
YESNO
CERAMIC HEATER RELAY DEFECTIVE·SHORT CIRCUIT BETWEEN CHASSIS SIDE RELAY TERMINAL
NO. X12-3 AND CHASSIS SIDE CONNECTOR TERMINALNO. B49-1

SERVICE INFORMATION 00 Ð 23
AIR CONDITIONING CYCLE TROUBLESHOOTING
No cooling or insuffi-
cient cooling
Insufficient velocity
of cooling air1. Magnetic clutch does not run
2. Compressor is not rotating properly
·Drive belt loosened or broken
·Magnetic clutch face is not
clean and slips
·Incorrect clearance between
magnetic drive plate and pulley
·Compressor oil leaks from shaft
seal or shell
·Compressor seized
3. Insufficient or excessive charge of
refrigerant
4. Leaks in the refrigerant system
5. Condenser clogged or insufficient
radiation
6. Temperature control link unit of the
heater unit defective
7. Unsteady operation due to foreign
substance in expansion valve
8. Poor operation of electronic thermo-
stat
1. Evaporator clogged or frosted
2. Air leaking from cooling unit or air
duct
3. Blower motor does not rotate prop-
erly·Refer to ÒMAGNETIC CLUTCHÓ
troubleshooting
·Adjust the drive belt to the specified
tension or replace the drive belt
·Clean the magnetic clutch face or
replace
·Adjust the clearance (Refer to
Section 1D ÒCOMPRESSOR OVER-
HAULÓ
·Replace the compressor
·Replace the compressor
·Discharge and recover refrigerant.
Recharge to specified amount.
·Check refrigerant system for leaks
and repair as necessary
Discharge and recover refrigerant.
Recharge to specified amount.
·Clean the condenser or replace as
necessary
·Check radiator or condenser fan
function
·Repair the link unit
·Replace the expansion valve
·Check electronic thermostat and
replace as necessary
·Check evaporator core and replace
or clean the core
·Check evaporator and duct connec-
tion, then repair as necessary
·Refer to Section 00 for ÒFAN
CONTROL KNOB (FAN SWITCH)Ó
troubleshooting
* For the execution of the charging and discharging operation in the table above, refer to the ÒRECOVERY,
RECYCLING, EVACUATING AND CHARGINGÓ in section 1B.
TROUBLEPOSSIBLE CAUSECORRECTION

00 Ð 32 SERVICE INFORMATION
MAGNETIC CLUTCH DOES NOT RUN
·ARE NO. C-20 (10A) FUSE AND NO. C-19 (25A) FUSES OK?
YESNO
REPLACE·ARE HEATER & A/C (B-36) AND THERMOSTAT (X-5)
RELAYS OK?
YESNO
REPLACE·IS PRESSURE SWITCH (DUAL PRESSURE SWITCH) OK?
YESNO
SWITCH DEFECTIVE OR INSUFFICIENT REFRIGERANT·ARE A/C SWITCH AND FAN CONTROL KNOB (FAN
SWITCH) OK?
YESNO
REPLACE·TURN THE IGNITION SWITCH ÒONÓ (ENGINE IS
RUNNING)
·A/C SWITCH AND FAN CONTROL KNOB (FAN SWITCH
ÒONÓ
·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE CONNECTOR TERMINAL NO. E3-1
NOYES
MAGNETIC CLUTCH DEFECTIVE ·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE CONNECTOR TERMINAL NO. C25-1
YESNO
OPEN CIRCUIT BETWEEN NO. C-20 (10A) FUSE AND
NO. C25-1·DISCONNECT THERMO RELAY (X-5)
·CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT AT
CHASSIS SIDE RELAY TERMINAL NO. X5-2
YESNO
OPEN CIRCUIT BETWEEN NO. C25-2 AND NO. X5-2 ·CHECK TO SEE IF VOLTAGE (APPROX. 10V) IS PRESENT
CHASSIS SIDE RELAY TERMINAL NO. X5-1 AND
NO. X5-3
CONTINUED NEXT PAGE

SERVICE INFORMATION 00 Ð 41
I-18 I-23
123456126
OFF
1
FAN SW. 2
3
4
OFF
A/C SW.
ON
FAN CONTROL KNOB (FAN SWITCH) AND A/C
SWITCH
INDIVIDUAL INSPECTION
Check for continuity between fan switch and A/C switch
side connector terminals.
2
65 4 31362
51
4

I-23I-18
I-23I-18
5
A/C SW. BEZEL
ILLUMI-
NATION
FAN SW. OFF1
2
3
4 32 6 1253641
HEATER & A/C, THERMOSTAT, COMPRESSOR,
CONDENSER FAN AND CERAMIC HEATER RELAY
Check for continuity between the relay terminals.
2Ð 4..... No continuity
(When battery voltage is applied between 1Ð 3)
2Ð 4..... Continuity
2
2
1
144
3
3
Terminal
No. SW.
position
DUAL PRESSURE SWITCH
21
Disconnect pressure switch connector and check for
continuity between pressure switch side connector
terminals.

SERVICE INFORMATION 00 Ð 43
CONDENSER FAN
1 2
THERMO SWITCH (ENGINE)
1 2
1) Disconnect the condenser fan connector (C-75).
2) Connect the battery positive terminal to the No. 1
terminal and negative to No. 2.
3) Be sure to check to see if condenser fan operates
correctly.
With the environmental temperature of the switch set to
the following conditions, check to see if there is any
continuity between the switch side connector terminals.
Ambient Terminal
Continuity
Temperature No.
Above 77 Ð 83°C
1Ð 2No Continuity
(170.6Ð181.4°F)
CERAMIC HEATER
1
2
Ceramic heater
Disconnect the ceramic heater connector and check for
continuity between ceramic heater side connector
terminals.
Connector No. B-48
Terminal 1 2
Continuity

00 Ð 44 SERVICE INFORMATION
FULL HOT SWITCH
21
Temperature
control link
Full hot switch
1) With the temperature control knob set to the full hot
position, check to see visually if the temperature
control link of the heater unit operate correctly and if
the link contacts securely with the full hot switch.
2) Disconnect the full hot switch connector.
3) With the full hot switch contacted, check to see if
there is any continuity between the switch side
connector terminals.
B-49
Terminal
Full No. 1 2
hot switch
FREE
CONTACT

SERVICE INFORMATION 00 Ð 45
HEATER UNIT
Temperature control Reheat air mix system
Capacity (Kcal./hr.) 3,700
Air flow (m
3/hr.) 280
HEATER CORE
Type Fin & tube type
Element dimension mm (in.) 161 (6.3) ´163 (6.4) ´45 (1.8)
Radiating area m
2Approx. 2.1
EVAPORATOR ASSEMBLY
Capacity (Kcal./hr.) 4,200
Air flow (m
3/hr.) 470
EVAPORATOR CORE
Type Al-laminate louver fin type
Element dimension mm (in.) 235 (9.3) ´224 (8.8) ´74 (2.9)
EXPANSION VALVE
Type External pressure equalizer type
THERMOSTAT SWITCH
Type Electronic thermostat
°C (F) OFF: 3.5 ±0.5 (38.3 ±0.9)
ON: 5.0 ±0.5 (41.0 ±0.9)
CONDENSER
Type Parallel flow
Radiation performance (Kcal./hr.) 11,500
RECEIVER/DRIER
Type Assembly includes sight glass with dual (triple)
pressure switch
Internal volume cc (Imp. fl oz) 300 (8.5)
PRESSURE SWITCH
Type Dual pressure switch
kPa (kgácm
2/ PSI)·Low pressure control
ON: 205.9 ±30 (2.1 ±0.3 / 29.9 ±4)
(Except 6VD1 / 6VE1, LHD model)
186 ± 30 (1.9 ± 0.3 / 27 ± 4)
(only for 6VD1/ 6VE1, LHD model)
OFF: 176 ±20 (1.8 ±0.2 / 26 ±3)
·High pressure control
ON: 2354 ±196 (24.0 ±2.0 / 341 ±28)
OFF: 2942 ±196 (30.0 ±2.0 / 427 ±28)
Triple pressure switch (W/Condenser fan)
·Low pressure control
ON: 186 ±30 (1.9 ±0.3 / 27 ±4)
OFF: 176 ± 20 (1.8 ±0.2 / 26 ±3)
·Medium pressure control
ON: 1471 ±98 (15.0 ±1.0 / 213 ±14)
OFF: 1079 ±98 (11.0 ±1.0 / 156 ±14)
·High pressure control
ON: 2354 ±196 (24.0 ±2.0 / 341 ±28)
OFF: 2942 ±196 (30.0 ±2.0 / 427 ±28)
REFRIGERANT
Type/Specified amount g (lbs) HFC-134a / 750 (1.65)
MAIN DATA AND SPECIFICATIONS

CAUTION
When fasteners are removed, always
reinstall them at the same location from
which they were removed. If a fastener
needs to be replaced, use the correct part
number fastener for that application. If the
correct part number fastener is not available,
a fastener of equal size and strength (or
stronger) may be used. Fasteners that are not reused, and those
requiring thread locking compound, will be
called out. The correct torque values must
be used when installing fasteners that
require it. If the above conditions are not
followed, parts or system damage could
result.
HEATING AND VENTILATION 1A Ð 1
SECTION 1A
HEATING AND VENTILATION
CONTENTS
PAGE
General Description.....................................................1AÐ 2
Heater...............................................................1AÐ 2
Control Lever Assembly................................................1AÐ 3
Ventilation...........................................................1AÐ 3
Air Select Knob.......................................................1AÐ 4
Air Source Select Lever................................................1AÐ 4
Fan Control Knob.....................................................1AÐ 4
Temperature Control Knob.............................................1AÐ 4
Ceramic Heater.......................................................1AÐ 5
On-Vehicle Service......................................................1AÐ 6
Heater Unit..........................................................1AÐ 6
Heater Core and/or Mode Door..........................................1AÐ 8
Heater Mode Control Link Unit..........................................1AÐ10
Heater Temperature Control Link Unit....................................1AÐ12
Blower Assembly.....................................................1AÐ14
Blower Link Unit and/or Mode Door......................................1AÐ16
Blower Motor........................................................1AÐ18
Rear Heater Duct, Defroster Nozzle and Ventilation Duct....................1AÐ20
Center and/or Side Vent...............................................1AÐ22
Control Lever Assembly and/or Control Cables............................1AÐ24
Control Panel Illumination Bulb..........................................1AÐ27
Resistor.............................................................1AÐ28
Ceramic Heater and/or Full Hot Switch...................................1AÐ30