Mitsubishi Montero (1998+). Manual - part 23

Fig. 3:  Testing A/C Engine Coolant Temperature Switch

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         AIR THERMOSENSOR & AIR INLET SENSOR

         1) Disconnect sensor connector at evaporator case. See

Fig. 12. Using ohmmeter, measure resistance between sensor terminals.

See AIR THERMOSENSOR & AIR INLET SENSOR SPECIFICATIONS table.

         2) If resistance is not within specifications, faulty sensor

must be replaced. If resistance is within specifications and all other

components are okay, replace A/C Compressor Control Unit (ACCU).

AIR THERMOSENSOR & AIR INLET SENSOR SPECIFICATIONS TABLE

Sensor Temperature 



F (



C)                              Ohms

-20 (-4)  ..........................................  12,000

32 (0)  ..............................................  4800

50 (10)  .............................................  2800

68 (20)  .............................................  1800

86 (30)  .............................................  1000

104 (40)  .............................................  800

         BLOWER RESISTOR

         Disconnect blower resistor connector. Using an ohmmeter,

measure resistance between indicated terminals. See BLOWER RESISTOR

RESISTANCE table. See Fig. 4

BLOWER RESISTOR RESISTANCE TABLE

Application &                                           Ohms

Terminal No.

2 & 3  ..........................................  0.31-0.35

2 & 1  ..........................................  0.88-1.02

2 & 4  ..........................................  1.82-2.10

Fig. 4:  Testing Blower Resistor

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         BLOWER SWITCH

         With blower switch in position indicated in BLOWER SWITCH

CONTINUITY TEST table, ensure continuity exists between terminals

listed. See Fig. 5.

Fig. 5:  Identifying Blower Switch Terminals

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BLOWER SWITCH CONTINUITY TEST TABLE

Switch                                    Continuity Between

Position                                        Terminal No.

OFF  ..................................................  ( 1)

Low  .........................................  1 & 8; 3 & 5

Medium-Low  ..................................  1 & 8; 5 & 6

Medium-High  ..............................  1, 4 & 8; 2 & 5

High  .....................................  1, 4 & 8; 5 & 7

(1) - Continuity should not exist between any terminals.

         DUAL-PRESSURE SWITCH

         Disconnect dual-pressure connector, and connect a jumper wire

across harness connector terminals. Connect manifold gauge set to

system, and check operating pressures. Dual-pressure switch will allow

compressor operation when system pressure is within specification.

When high or low pressure side of dual-pressure switch is at operation

pressure (ON), condition is normal if there is continuity between the

respective terminals. If continuity is not present when switch is ON,

replace dual-pressure switch. See PRESSURE SWITCH SPECIFICATIONS

table.

PRESSURE SWITCH SPECIFICATIONS TABLE (1)

Application              ON Pressure            OFF Pressure

                         psi (kg/cm



)           psi (kg/cm



)

High Pressure  .........  455 (32)  ..............  541 (38)

Low Pressure  ..........  32 (2.2)  ..............  28 (2.0)

(1) - With ambient temperature at 80



F (27



C).

         COMPRESSOR CLUTCH

         Disconnect wiring to compressor clutch. Connect battery

voltage directly to A/C compressor clutch wiring harness terminals. If

click is heard, clutch engagement is okay. If click is not heard,

pulley and armature are not making contact. Repair or replace as

necessary.

         RELAYS

         4-Terminal Relay

         1) Remove relay from relay box located in engine compartment.

Using an ohmmeter, check continuity between relay terminals.

Continuity should exist between terminals No. 2 and 4, but not between

terminals No. 1 and 3. See Fig. 6.

         2) Connect battery voltage to terminal No. 2, and ground

terminal No. 4. Ensure continuity now exists between terminals No. 1

and 3. If continuity is not as specified, replace relay.

Fig. 6:  Testing 4-Terminal Relay

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         REMOVAL & INSTALLATION

         * 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 RESTRAINT

         SYSTEM article.

NOTE:    For removal and installation procedures not covered in this

         article, see HEATER SYSTEM article.

         A/C CONTROL UNIT (ACCU)

         Removal & Installation

         Lower glove box. Remove 2 clips on top of evaporator, and

remove ACCU. Disconnect wiring harness from ACCU. To install, reverse

removal procedure. See Fig. 7.

Fig. 7:  Locating A/C Control Unit (ACCU)

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