HVAC System - Manual Chevrolet Malibu V

A/C SYSTEM SPECIFICATIONS

A/C SYSTEM SPECIFICATIONS

DESCRIPTION

SYSTEM DESCRIPTION

Manual A/C-heater systems use a Variable Displacement Orifice Tube (VDOT) refrigerant system with a constant-run, Harrison V5 variable displacement compressor. Basic compressor operation is achieved using a variable-angle wobble plate and 5 axially-oriented cylinders. Compressor can vary its displacement to match A/C demands under all conditions.

Blower Speed Control

Blower speed is controlled by blower speed selector which operates an electrical switch. On all models, 5 different blower motor speeds can be selected to control amount of airflow through A/C-heater module.

Mode Control

Several A/C-heater control panel mode settings are possible to provide the desired comfort level. Some models may use international symbols. Each mode is listed in order (clockwise) as positioned on mode selector. Operation is as follows

1. VENT: In this mode, compressor does not operate and outside air is delivered through instrument panel vents.
2. BI-LEV (Bi-Level): In this mode, conditioned air is directed through instrument panel vents and floor ducts.
3. FLOOR: In this mode, outside air is heated and directed through floor ducts.
4. Defog: In this mode, heated airflow is divided between windshield defroster vents and floor ducts.
5. Defrost: In this mode, heated air is directed to windshield defroster vents.

Fresh/Recirculated Air Control

Recirculation feature is controlled using appropriate switch on A/C-heater control panel. Switch controls a solenoid which directs vacuum to vacuum actuator that moves recirculation valve.

Temperature Control

Temperature is controlled according to position of temperature selector on A/C-heater control panel. An electric motor (air temperature actuator) is used to control temperature valve based on input from temperature selector. Temperature valve controls airflow through heater core as temperature selector is moved through its full travel.

A/C COMPRESSOR CONTROL RELAY

Powertrain Control Module (PCM) energizes A/C control relay for compressor operation. If PCM receives a signal indicating Wide Open Throttle (WOT) or excessive engine heat, it will de-energize A/C control relay, stopping A/C compressor operation. During hot engine restart, compressor engagement is delayed 3 seconds until engine idle stabilizes.

A/C PRESSURE SENSOR

An electronic pressure sensor is mounted in-line between compressor and condenser. Pressure sensor output signal is sent to Powertrain Control Module (PCM). Signal is variable and is dependent upon pressure inside refrigerant line. PCM will stop compressor operation if pressure exceeds 428 psi (30.1 kg/cm 2 ), or is less than 43 psi (3.0 kg/cm 2 ). Higher pressures result in higher voltage output signal to PCM. PCM uses this signal to increase idle speed to compensate for A/C load and control cooling fan operation.

ACCUMULATOR

The accumulator (located at condenser outlet) receives and stores vapor, some liquid, and refrigerant oil from evaporator. An oil bleed hole (located in bottom of accumulator) returns oil to the A/C compressor. A desiccant bag inside accumulator absorbs moisture.

BLOWER MOTOR RELAY

The blower motor relay is used to by-pass the blower motor resistor during high blower speed operation. When blower speed selector is turned to its highest position, the blower motor relay is energized, applying direct battery voltage to blower motor.

CONDENSER

Condenser (located in front of radiator) is made up of coils attached with fins to transfer heat. Air passing through condenser cools high pressure, high temperature refrigerant vapor, causing it to condense to a liquid.

EVAPORATOR

Evaporator (located inside A/C-heater module) cools and dehumidifies air before entering passenger compartment. As high pressure liquid refrigerant flows through expansion tube, it becomes a low pressure liquid and enters evaporator. Heat in the air passing through evaporator is transferred to cooler surface of the evaporator coils, cooling passenger compartment air. Any humidity resulting from this process is condensed on evaporator core, then drained from vehicle.

EXPANSION TUBE

Expansion tube (located inside evaporator inlet pipe) is a plastic assembly containing a fixed diameter tube with a mesh filter screen at each end. Expansion tube creates a restriction in high pressure liquid line, metering flow of refrigerant to evaporator, changing it to a low pressure liquid.

FLOW CONTROL VALVE

Flow control valve ("H" valve) is used on models equipped with 2.4L engine and is attached to heater hose between engine and heater core. Flow control valve assists in heater warm-up.

PRESSURE RELIEF VALVE

Pressure relief valve is located on rear of compressor. Valve opens automatically when discharge (high-side) pressure reaches approximately 460 psi (32.3 kg/cm 2 ). This prevents system damage caused by excessive pressure.

TEMPERATURE VALVE

Temperature valve movement is controlled by air temperature actuator. Air temperature actuator is an electric motor electronically linked to A/C-heater control panel. Air is prevented from flowing across heater core when temperature selector is in cold position. Air is allowed to flow across heater core with temperature selector in any other position.

TROUBLE SHOOTING

A/C COMPRESSOR CLUTCH CONTROL

Note. See A/C COMPRESSOR CLUTCH CONTROLS article. See procedures in A/C-HEATER SYSTEM TROUBLE SHOOTING - MANUAL article.

AIR TEMPERATURE ACTUATOR INOPERATIVE/ AIR TEMPERATURE DOES NOT CHANGE

1. Check for blown HTR A/C IGN fuse (10-amp) if air temperature does not change with temperature selector movement. If fuse is blown, check for short to ground. Repair as necessary. If fuse is okay, go to next step.
2. Turn ignition on. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C2, terminal "C" (Brown wire) at A/C-heater control panel. If reading is battery voltage, go to next step. If reading is not as specified, go to step 4).
3. Disconnect A/C-heater control panel harness connector C2. Measure voltage between terminal "C" (Brown wire) and terminal "K" (Black/White wire) at harness connector C2. If reading is battery voltage, go to step 5). If reading is not as specified, repair open in Black/White wire between A/C-heater control panel and ground. Retest System.
4. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C3, terminal A11 (Brown wire) at underhood electrical center. If reading is battery voltage, repair open in Brown wire between A/C-heater control panel and underhood electrical center. Retest system. If reading is not as specified, replace underhood electrical center. Retest system.
5. Reconnect A/C-heater control panel harness connector C2. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C2, terminal "G" (Light Blue wire) at A/C-heater control panel. Turn temperature selector to full cold position, then full hot position. If reading changes from one volt to 12 volts, go to next step. If reading does not change as specified, replace A/C-heater control panel. Retest system.
6. Using a voltmeter, measure voltage (backprobe) between ground and terminal No. 8 (Light Blue wire) at air temperature actuator harness connector. Turn temperature selector to full cold position, then full hot position. If reading changes from one volt to 12 volts, go to next step. If reading does not change as specified, repair open in Light Blue wire between A/C-heater control panel and air temperature actuator. Retest system.
7. Using a voltmeter, measure voltage (backprobe) between ground and terminal No. 10 (Brown wire) at air temperature actuator harness connector. If reading is battery voltage, go to next step. If reading is not a specified, repair open in Brown wire between underhood electrical center and air temperature actuator. Retest system.
8. Disconnect air temperature actuator harness connector. Using a voltmeter, measure voltage between terminal No. 7 (Black/White wire) and terminal No. 10 (Brown wire) at air temperature actuator harness connector. If reading is battery voltage, replace air temperature actuator. Retest system. If reading is not as specified, repair open in Black/White wire between air temperature actuator and ground. Retest system.

BLOWER MOTOR INOPERATIVE

1. Ensure HVAC BLOWER fuse (20-amp) and HI BLO MOT fuse (30-amp) are okay. Ensure ground circuits to blower motor and blower motor relay are okay. If fuses are blown, check for short to ground. Repair as necessary. If no problems are found, go to next step.
2. Exchange blower motor relay with a known-good relay from underhood electrical center. If blower motor runs, replace faulty blower motor relay. Retest system. If blower motor does not run, go to next step.
3. Using a fused jumper wire, jumper (backprobe) between battery positive terminal and connector C3, terminal B9 (Purple wire) at underhood electrical center. If blower motor runs, go to step 6). If blower motor does not run, go to next step.
4. Turn ignition on. Turn blower switch to M3 (medium-high speed) position. Disconnect blower motor harness connector. Using a test light connected to ground, probe Purple wire at harness connector. If test light comes on, go to next step. If test light does not come on, repair open in Purple wire between blower motor and underhood electrical center. Retest system.
5. Connect a test light between both terminals of blower motor harness connector. If test light comes on, replace blower motor. Retest system. If test light does not come on, repair open in ground circuit (Black wire) between blower motor and chassis ground. Retest system.
6. Turn ignition on. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C1, terminal "B" (Brown wire) at A/C-heater control panel. If reading is battery voltage, go to step 8). If reading is not as specified, go to next step.
7. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C1, terminal A5 (Brown wire) at right-side instrument panel electrical center. If reading is battery voltage, repair open in Brown wire between A/C-heater control panel and right-side instrument panel electrical center. Retest system. If reading is not as specified, replace right-side instrument panel electrical center. Retest system.
8. Turn blower switch to M3 (medium-high speed) position. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C1, terminal "E" (Purple wire) at A/C-heater control panel. If reading is battery voltage, replace underhood electrical center. Retest system. If reading is not a specified, replace A/C-heater control panel. Retest system.

BLOWER MOTOR INOPERATIVE IN LOW SPEED

1. Turn ignition on. Turn blower switch to LO (low speed) position. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C1, terminal "H" (Yellow wire) at A/C-heater control panel. If reading is battery voltage, go to next step. If reading is not as specified, replace A/C-heater control panel. Retest system.
2. Disconnect blower motor resistor harness connector. Using a voltmeter, measure voltage between ground and terminal "B" (Yellow wire) at harness connector. If reading is battery voltage, replace blower motor resistor. Retest system. If reading is not as specified, repair open in Yellow wire between blower motor resistor and A/C-heater control panel.

BLOWER MOTOR INOPERATIVE IN MEDIUM-LOW SPEED

1. Turn ignition on. Turn blower switch to M1 (medium-low speed) position. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C1, terminal "G" (Tan wire) at A/C-heater control panel. If reading is battery voltage, go to next step. If reading is not as specified, replace A/C-heater control panel. Retest system.
2. Disconnect blower motor resistor harness connector. Using a voltmeter, measure voltage between ground and terminal "C" (Tan wire) at harness connector. If reading is battery voltage, replace blower motor resistor. Retest system. If reading is not as specified, repair open in Tan wire between blower motor resistor and A/C-heater control panel.

BLOWER MOTOR INOPERATIVE IN MEDIUM SPEED

1. Turn ignition on. Turn blower switch to M2 (medium speed) position. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C1, terminal "F" (Light Blue wire) at A/C-heater control panel. If reading is battery voltage, go to next step. If reading is not as specified, replace A/C-heater control panel. Retest system.
2. Disconnect blower motor resistor harness connector. Using a voltmeter, measure voltage between ground and terminal "A" (Light Blue wire) at harness connector. If reading is battery voltage, replace blower motor resistor. Retest system. If reading is not as specified, repair open in Light Blue wire between blower motor resistor and A/C-heater control panel.

BLOWER MOTOR INOPERATIVE IN MEDIUM-HIGH SPEED

1. Turn ignition on. Turn blower switch to M3 (medium-high speed) position. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C1, terminal "E" (Purple wire) at A/C-heater control panel. If reading is battery voltage, go to next step. If reading is not as specified, replace A/C-heater control panel. Retest system.
2. Disconnect blower motor resistor harness connector. Using a voltmeter, measure voltage between ground and terminal "D" (Purple wire) at harness connector. If reading is battery voltage, replace blower motor resistor. Retest system. If reading is not as specified, repair open in Purple wire between blower motor resistor and A/C-heater control panel.

BLOWER MOTOR INOPERATIVE IN HIGH SPEED

1. Exchange blower motor relay with a known-good relay from underhood electrical center. If blower motor runs, replace faulty blower motor relay. Retest system. If blower motor does not run, go to next step.
2. Turn ignition on. Turn blower switch to HI (high speed) position. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C3, terminal D9 (Orange wire) at underhood electrical center. If reading is battery voltage, go to step 4). If reading is not as specified, go to next step.
3. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C3, terminal D9 (Orange wire) at underhood electrical center. If reading is battery voltage, repair open in Orange wire between A/C-heater control panel and underhood electrical center. Retest system. If reading is not as specified, replace A/C-heater control panel. Retest system.
4. Connect a test light (backprobe) harness connector C3 at underhood electrical center between terminal A10 (Black wire) and terminal D9 (Orange wire). If test light comes on, replace underhood electrical center. Retest system. If test light does not come on, repair open in Black wire between underhood electrical center and chassis ground. Retest system.

BLOWER MOTOR OPERATES IN HIGH SPEED ONLY

1. Exchange blower motor relay with a known-good relay from underhood electrical center. If blower motor runs, replace faulty blower motor relay. Retest system. If blower motor does not run, go to next step.
2. Turn ignition on. Turn blower switch to M3 (medium-high speed) position. Using a voltmeter, measure voltage (backprobe) between ground and terminal "E" (Dark Blue wire) at blower motor resistor. If reading is battery voltage, go to next step. If reading is not as specified, replace blower motor resistor assembly. Retest system.
3. Using a voltmeter, measure voltage (backprobe) between ground and harness connector C3, terminal C10 (Dark Blue wire) at underhood electrical center. If reading is battery voltage, replace underhood electrical center. Retest system. If reading is not as specified, repair open in Dark Blue wire between blower motor resistor assembly and underhood electrical center. Retest system.

TESTING

A/C SYSTEM PERFORMANCE

1. Place vehicle out of direct sun light. Ensure garage (outside) ambient air temperature is 70-90°F (21-32°C). Go to next step.
2. Close all vehicle doors and windows. Start engine and allow it to reach normal operating temperature. Turn mode selector to VENT position, blower speed selector to high speed position, and temperature selector to full cold position. Run engine for 5 minutes to allow A/C system to stabilize. Go to next step.
3. Feel liquid line on both sides of expansion tube. Temperature between sides should be noticeably different, and discharge air temperature should be about 20°F (7°C) cooler than ambient air temperature on a normally operating system. If operation is not as described, see «A/C-HEATER SYSTEM TROUBLE SHOOTING»(/chevrolet/malibu/v-1996-2000/remont/manual-hvac-system/#hvac-system-manual-trouble-shooting) - MANUAL article.

AIR DELIVERY CONTROLS

1. Before diagnosing vacuum actuators, check for manifold vacuum at Black vacuum hose to vacuum tank. Repair as necessary. Check Violet vacuum hose between vacuum tank and A/C-heater control panel for damage. Repair as necessary.
2. If vacuum hoses are okay, test temperature valve. Move temperature selector from full cold position to full hot position, then back to full cold position. Temperature valve should move smoothly through full travel. If temperature valve binds, moves unevenly or erratically, see AIR TEMPERATURE ACTUATOR INOPERATIVE/AIR TEMPERATURE DOES NOT CHANGE under TROUBLE SHOOTING.

VACUUM ACTUATORS

1. Start engine and allow it to idle. Cycle through operating modes of A/C-heater control panel while observing vacuum actuators. Check for vacuum to actuators by observing actuator position. When vacuum is applied, actuator should retract.
2. Ensure proper vacuum hose connections to vacuum actuators. See ACTUATOR HOSE IDENTIFICATION table. (Scheme 25)and (Scheme 26). To determine correct vacuum supply to each actuator, See AIR DELIVERY VACUUM DISTRIBUTION table.

ACTUATOR HOSE IDENTIFICATION

AIR DELIVERY VACUUM DISTRIBUTION

Scheme 25

Scheme 26

REMOVAL & INSTALLATION

Disconnect negative battery cable. Remove accessory trim plate. Remove A/C-heater control panel retaining screws. Pull control panel away from instrument panel and disconnect electrical and vacuum connections. Remove A/C-heater control panel. To install, reverse removal procedure.

1. Disconnect negative battery cable. Drain cooling system. Discharge A/C system, using approved refrigerant recovery/recycling equipment. Disconnect heater hoses from heater core. Remove instrument panel and console. See INSTRUMENT PANEL & CONSOLE ASSEMBLY.
2. Remove heater core seal plate from front of dash. Remove moisture drain tube from A/C-heater module. Disconnect evaporator block fitting from evaporator. Remove evaporator seal plate from front of dash. Remove instrument panel tie bar.
3. Remove flexible floor air duct from A/C-heater module. Remove both wire and vacuum harnesses from A/C-heater module. Disconnect electrical connections from blower motor and blower resistor.
4. Remove nuts attaching A/C-heater module to firewall. Remove A/C-heater module from vehicle. To install, reverse removal procedure. Fill cooling system. Evacuate, charge and leak test A/C system.

When removing pressure sensor, DO NOT discharge system. Pressure sensor is mounted on a Schrader valve. Disconnect electrical connector. Remove sensor from refrigerant line and discard "O" ring. To install, reverse removal procedure. Install NEW "O" rings lubricated with clean mineral-base refrigerant oil.

1. Disconnect negative battery cable. Discharge A/C system, using approved refrigerant recovery/recycling equipment. Raise and support vehicle. Remove right front wheel. Remove engine splash shield.
2. Disconnect accumulator inlet and outlet lines and discard "O" rings. Loosen or remove accumulator mounting bracket bolts. Remove accumulator with or without bracket as needed.
3. To install, reverse removal procedure. Add 3.5 ounces of refrigerant oil to accumulator. Install NEW "O" rings lubricated with clean mineral-base refrigerant oil. DO NOT soak "O" rings. Evacuate, charge and leak test A/C system.

Removal & Installation (Defrost & Mode Valves)

1. Disconnect negative battery cable. Remove instrument panel and console. See INSTRUMENT PANEL & CONSOLE ASSEMBLY. Remove valve housing cover from A/C-heater module. (Scheme 27)
2. Disconnect mode valve actuator link from mode valve. (Scheme 25) Remove mode valve from A/C-heater module. Disconnect defrost valve actuator link from defrost valve. (Scheme 26) Remove defrost valve from A/C-heater module. To install, reverse removal procedure.

Scheme 27

Removal & Installation (Heater & Temperature Valves)

1. Disconnect negative battery cable. Remove instrument panel and console. See INSTRUMENT PANEL & CONSOLE ASSEMBLY. Remove floor heater duct connector. Remove heater outlet duct.
2. Remove heater core cover. (Scheme 28) Disconnect heater valve lever link. Remove heater valve. Drain cooling system. Remove heater hoses from heater core. Remove heater core and heater core shroud.
3. Remove air temperature actuator from temperature valve. (Scheme 26) Remove clip securing actuator end of temperature valve shaft. Remove temperature valve by sliding valve to right side, then pulling down until actuator end of valve can be removed. To install, reverse removal procedure. Fill cooling system.

Scheme 28

Removal & Installation (Recirculation Valve)

Disconnect negative battery cable. Remove A/C-heater module from vehicle. See A/C-HEATER MODULE. Remove recirculation valve vacuum actuator from A/C-heater module. (Scheme 26) Remove recirculation valve inlet housing from A/C-heater module. Remove recirculation valve from inlet housing. To install, reverse removal procedure. Fill cooling system. Evacuate, charge and leak test A/C system.

Air temperature actuator is attached to right side of A/C-heater module. (Scheme 26) Remove glove box. Disconnect air temperature actuator harness connector. Remove air temperature actuator. To install, reverse removal procedure.

Disconnect negative battery cable. Remove right-side sound insulator. Remove Body Function Controller (BFC) and secure aside. Disconnect blower motor harness connector. Remove blower motor screws. Remove blower motor from vehicle. (Scheme 27) Fan is pressed onto blower motor shaft and cannot be serviced separately. To install, reverse removal procedure.

Blower motor resistor is located at lower right corner of A/C-heater module. Disconnect negative battery cable. Remove right-side sound insulator. Remove blower motor. See BLOWER MOTOR. Cut portion of dash mat to gain access to rear resistor screw. Disconnect resistor electrical connector. Remove resistor mounting screws, then resistor. To install, reverse removal procedure.

1. Discharge A/C system, using approved refrigerant recovery/recycling equipment. Disconnect negative battery cable. Remove serpentine belt. Raise and support vehicle. Lower closeout panel. Disconnect compressor electrical connector. Remove bolt attaching compressor hose assembly to rear of compressor and discard seals.
2. Remove hose assembly from compressor. Plug hose ends to prevent moisture contamination. Remove bolts attaching compressor to mounting bracket, then remove compressor and spacer (if equipped). Drain and measure oil from old compressor.
3. To install, reverse removal procedure. Use NEW seals. Ensure compressor contains proper amount of refrigerant oil. If less than one ounce of oil was drained, add 2 ounces of new refrigerant oil. If more than one ounce of oil was drained, add the same amount as that recovered. Evacuate, charge and leak test A/C system.

1. Disconnect negative battery cable. Discharge A/C system, using approved refrigerant recovery/recycling equipment. Drain cooling system.
2. Remove engine cooling fan. Disconnect evaporator tube from condenser outlet. Disconnect A/C compressor and condenser hose from condenser. Remove screws attaching condenser to radiator support.
3. Remove bolts from radiator upper mounting brackets. Tip radiator top toward engine. Carefully remove condenser from vehicle. To install, reverse removal procedure. Ensure replacement condenser contains one ounce of new refrigerant oil. Evacuate, charge and leak test A/C system.

1. Disconnect negative battery cable. Discharge A/C system, using approved refrigerant recovery/recycling equipment. Drain cooling system. Remove heater hoses from heater core. Disconnect evaporator block fitting from evaporator and discard sealing washers.
2. Remove evaporator seal plate from front of dash. Remove moisture drain tube from front of A/C-heater module. Remove instrument panel and console assembly. See INSTRUMENT PANEL & CONSOLE ASSEMBLY.
3. Remove heater outlet duct and heater core cover. (Scheme 28) Remove heater core mounting clamps, then heater core. Remove heater core shroud. Remove evaporator core. (Scheme 27)
4. To install, reverse removal procedure. Use NEW sealing washers on evaporator connections. Fill cooling system. Evacuate, charge and leak check A/C system.

Removal

1. Discharge A/C system, using approved refrigerant recovery/recycling equipment. Raise and support vehicle. Disconnect hoses from condenser and discard "O" rings. Remove evaporator tube from condenser. Using needle-nose pliers, carefully remove expansion tube.
2. If expansion tube is difficult to remove, remove as much of residue as possible. Apply heat with heat gun about 1/4" (7 mm) from dimples on inlet pipe. DO NOT overheat pipe. While applying heat, grip expansion tube. Using a turning motion along with a push-pull motion, loosen and remove expansion tube.

Installation

To install, reverse removal procedure. Install NEW "O" rings lubricated with clean mineral-base refrigerant oil. Ensure correct expansion tube is installed. Evacuate, charge and leak test A/C system.

Disconnect negative battery cable. Drain cooling system. Remove heater hoses from heater core. Remove moisture drain tube from front of A/C-heater module. Remove instrument panel and console assembly. See INSTRUMENT PANEL & CONSOLE ASSEMBLY. Remove heater outlet duct and heater core cover. (Scheme 28) Remove heater core mounting clamps, then heater core. To install, reverse removal procedure. Fill cooling system and check for leaks.

1. Disconnect negative battery cable. Disable air bag system. See AIR BAG RESTRAINT SYSTEM article in ACCESSORIES AND ELECTRICAL. Remove defrost grille. Remove instrument panel valance and attaching screws underneath. Remove instrument panel end caps and attaching screws underneath.
2. Remove glove box. Remove steering wheel, steering column covers and stalks. Remove instrument cluster and accessory trim plates, then instrument cluster.
3. Remove A/C-heater control panel and radio/tape deck. Remove ignition switch. Using a blunt tool, gently pry out all outlet vents. Loosen center console and pull rearward to disengage from instrument panel.
4. Remove screws attaching instrument panel to tie bar. Remove instrument panel. Remove wiring harness from tie bar. Remove tie bar-to-A/C-heater module bolts. Remove tie bar-to-dash bolts. Remove tie bar. To install, reverse removal procedure.

Removal & Installation (Mode Actuator)

Disconnect negative battery cable. Remove left-side sound insulator. Disconnect vacuum hoses from vacuum actuator and mark for installation. (Scheme 25) Unclip vacuum actuator body from A/C-heater module. Using a 7 mm deep socket, depress tangs to remove actuator rod from vacuum actuator. Remove mode valve vacuum actuator from vehicle. To install, reverse removal procedure.

Removal & Installation (Recirculation & Defrost Actuators)

Disconnect negative battery cable. Remove glove box. Disconnect vacuum hose from recirculation actuator and mark for installation. (Scheme 26) Remove recirculation actuator from A/C-heater module and disconnect link from actuator. Disconnect link and vacuum hoses from defrost actuator and mark for installation. (Scheme 26) Remove defrost actuator from A/C-heater module. To install, reverse removal procedure.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

Scheme 29

Manual A/C-Heater System Wiring Diagram. Scheme 30

See also:
• A/C COMPRESSOR CLUTCH CONTROLS
• A/C-HEATER SYSTEM TROUBLE SHOOTING - MANUAL
• INSTRUMENT PANEL & CONSOLE ASSEMBLY