A/c-Heater System - Automatic Buick Regal II

DESCRIPTION

Note. Trouble Shooting and Diagnosis procedures and vacuum and electrical diagrams are at the end of this article.

The Electronic Touch Climate Control System (ETCC) is used on the Electra, LeSabre, Regal, Riviera, and Skyhawk models. The ETCC system is fully automatic, regulating fan speed, air inlet positions, and air outlet positions.

Electra, LeSabre, and Riviera models use electric actuators to control mode functions. On Regal and Skyhawk models, mode function actuators are vacuum-controlled. All models use an electrically-controlled temperature door.

Automatic operation of the system depends on 3 factors: (1) information from outside air and in-car temperature sensors, (2) what settings have been selected, and (3) the position of the temperature door. The system also automatically compensates for warmer or cooler outside temperatures and the heat generated by sunlight entering the windows.

When the "65°" selection is pressed, automatic adjustment is locked out and the system is operated at full cooling. The blower fan will operate on high speed and the recirculation door will be closed. Temperatures will drop well below 65°F. This will continue until some other selection is made.

The reverse is also true when the "85°" setting is pressed. The system will operate at full heating and will exceed 85°F until some other selection is made.

The control panel consists of 2 parts, a faceplate and the control box containing the electronic components. The faceplate and control box are not serviceable, and must be replaced as a single unit. Control panels are not interchangeable.

OPERATION

A series of low current switches are located behind the faceplate. When touched, they transfer the control selection to a microprocessor in the control box. The microprocessor serves 2 functions

1. Executes desired selection through power transistors.
2. Remembers the last selection ordered, and then displays that selection, through light emitting diodes (LED's) in the faceplate, the next time the ignition is turned on.

Control panels differ between models. On all models except Skyhawk, temperature guide settings between "65°" and "85°" are spaced in 2 1/2° increments. (Scheme 1) To adjust temperature, just touch the dot under the desired temperature.

Electronic Touch Climate Control Panel (This control panel is used on Electra, LeSabre, Regal Riviera models.). Scheme 1

The Skyhawk model offers the same temperature range, but in 1° increments. (Scheme 2) To change temperature on these models, push the "WARMER" or "COOLER" box until the dot under the desired degree setting lights up.

Electronic Touch Climate Control Panel (This control panel is used only on Skyhawk models.). Scheme 2

CONTROL PANEL

The control panel includes a non-serviceable faceplate and a control box. Low current switches behind the faceplate relay elections to a microprocessor inside the control box. System returns to last selected control setting each time ignition is turned on.

On all but Skyhawk models, 3 connector bodies attach to the rear of the control panel. The Skyhawk model has only 2 connectors. Connectors include

Regal

A 22-wire connector supplies power and feedback circuits to 5 vacuum solenoids in the programmer and to an electric temperature door actuator.

The 6-wire connector supplies B+ (battery feed) power, ignition switch power, in-car sensor circuit power, and backlighting power to faceplate.

The 8-wire connector supplies power to all A/C components in the engine compartment, such as blower motor, blower motor control, and compressor.

Electra, LeSabre, & Riviera

The 22-wire connector provides power feedback circuits to the electric actuator motors. The 6-wire and 8-wire connectors are the same as for the Regal.

Skyhawk

The 22-wire connector supplies power and feedback circuits to 4 vacuum solenoids in the programmer and to the electric temperature door actuator. It also supplies power to all A/C components in the engine compartment.

The 6-wire connector supplies B+ (battery feed) power, ignition switch power, in-car sensor circuit power, and backlighting power to faceplate. There is no 8-wire connector on Skyhawk models.

TEMPERATURE SWITCH

Specific switches for each engine size are mounted in right rear cylinder head. When system is in heater or bi-level modes, switch delays blower motor turn-on until coolant warms up. Switch is by-passed in "A/C" mode.

SENSORS

An in-car sensor and an outside (ambient) temperature sensor are used to provide basic control inputs for the system. The in-car sensor is located on the instrument panel carrier. The ambient sensor is located under the air inlet screen.

ASPIRATOR

Mounted on heater case, aspirator draws small amount of air from cold air portion of heater case. This causes passenger compart- ment air to be drawn across the in-car sensor. Sensor can signal control panel to adjust temperature as necessary to maintain the preselected temperature. Aspirator is connected to in-car sensor by a hose.

TEMPERATURE DOOR ACTUATOR

A drive motor and feedback variable resistor strip position the temperature door as selected by the control panel. The drive motor is connected by an arm to the temperature door, and allows door to move clockwise or counterclockwise.

The resistor strip informs the control panel of the door's position, by varying electrical resistance readings. The actuator is mounted in the center of the A/C module in the passenger compartment.

If improper door operation occurs (binding, obstruction or misadjustment), it shuts off current to drive motor and causes faceplate LED's to flash. Internal actuator components are not serviceable. (Scheme 3)

Actuator with Cover Removed (Temperature door actuator internal components shown.). Scheme 3

MODE ACTUATORS & WATER VALVE

On Electra, LeSabre, and Riviera models, mode actuators contain an electric drive motor and feedback circuitry. Riviera models also have an electric water valve. Operation is similar to temperature door actuator.

Doors may be stopped at specific positions as selected by the control panel. Non-reversible actuators rotate through 360°. In case of open feedback circuit, actuator will run continuously until shut off by the control panel timer (after 20 seconds). Mode LED on control panel will flash to indicate malfunction.

Regal and Skyhawk models have 4 vacuum-operated mode actuators. Regal also has a vacuum water valve, while Electra, LeSabre and Skyhawk models have no water valve. The air inlet recirc) door, water valve and upper mode door use 2-position actuators, while lower mode door uses a 3-position actuator with 2 vacuum hoses, one on each side of the diaphragm.

PROGRAMMER

On Regal and Skyhawk models, a programmer permits use of vacuum-operated actuators instead of electric actuators. The programmer is located directly below temperature door actuator on Regal models, and on right side of glove compartment on Skyhawk models.

The programmer contains 5 vacuum solenoids on Regal models, 4 vacuum solenoids on Skyhawk models. These solenoids switch vacuum to mode actuators, which determine the outlet through which warmed or cooled air will flow.

DEFROSTER ACTUATOR

On Electra, LeSabre, and Riviera models, the defroster actuator is always in the sealed "DEFROST" position when ignition is first turned on.

After the ignition has been on for 30-60 seconds, a timer circuit in the control panel will move the door to the bleed position.

BLOWER MOTOR & A/C CLUTCH CONTROL

The clutch and blower motor control is located in blower motor air stream in the engine compartment. The blower control feeds current to the blower motor through an infinitely variable speed range.

A power transistor circuit engages the compressor clutch when required.

Blower and A/C Clutch Control (Transistor engages and disengages compressor clutch.). Scheme 4

If temperature door actuator arm is out of adjustment, temperature mode lights will flash at either "65°" or "85°" panel position. To adjust, touch "85°" panel temperature setting, pull door rod toward inside of car, and snap rod into actuator retainer.

CONTROL SYSTEM

Note the following information when testing control system

1. "65°" selection drives system to maximum cold.
2. "85°" selection drives system to maximum heat.
3. A mode LED will flash if mode is malfunctioning (Electra, LeSabre & Riviera only). On Riviera models if water valve is malfunctioning, binding, or restricted, LED will flash.
4. A temperature LED will flash if temperature control actuator malfunctions.
5. A disconnected mode door actuator wire will cause mode LED's to flash.
6. An inoperative mode door, which is stopped in a position correct for one mode, will not cause LED to flash until control panel calls for actuator to move to another position.
7. Blower delay timer is engaged only when system senses it should be putting out heat in "ECONOMY", "AUTO-LO", "AUTO", and "BI- LEVEL" modes. Check timers by selecting "HI" and "65°" on control panel. There should be no delay in system operation.
8. To further check blower delay timer, select a high guide temperature setting and one of the previously mentioned modes. Timer should engage, keeping blower off for 3 minutes, until coolant has had a chance to warm up. Then blower should engage. In "A/C", "DEF" and "HI" modes, blower delay timer will not function. It will not operate when engine is warm.
9. Control panel must have a constant B+ first and then power from ignition switch to work properly.
10. An open sensor string will drive the system to maximum heat except at "65°" selection.
11. A shorted sensor string circuit will drive the system to maximum cold except at "85°" selection.

1. Switch ignition on. Touch "75°" and "AUTO" on control panel. Observe LED's come on.
2. If no lights, power is not reaching control panel. Check A/C fuse. If fuse is OK, check for break in feed wire to control panel on Regal (pin B) and Skyhawk (pin 3 of 22-pin connector) models.
3. On Electra, LeSabre and Riviera models, use a test light to check feed wire (pin B) for shorts, opens or disconnection.
4. Switch ignition on and off a few times to ensure that LED's always light "75°" and "AUTO". If LED changes position when ignition is turned on, the B+ feed wire may be disconnected or in wrong position, or fuse may be blown.

Note. Pin "B" (Regal) or "G" (Skyhawk) should have power at all times, even when ignition is off. Check center connector on rear of control panel for proper wire locations and engagement. If above test is unsatisfactory, replace control panel.

MODE ACTUATOR

1. With engine running at operating temperature, touch "85°" and "AUTO". Blower should gradually increase to maximum blower speed. Most of air will be coming from heater outlets, and some from defroster outlets. Air will be hot.
2. Control panel LED's will flash if temperature actuator does not reach maximum heat position. On Electra, LeSabre, and Riviera models, if mode doors are not in proper position, LED's will flash. Compressor cycles if ambient temperature is above 50°F.
3. Touch "65°" and "AUTO" mode. Listen for blower speed to diminish to low, then gradually increase to maximum speed in recirculating air position. Water valve will close, and air will become cool as it shifts to A/C outlets.
4. Compressor will cycle at ambient temperatures over 50°F. Panel LED's will flash if temperature door does not reach maximum cool position, if mode doors are not in A/C recirculating position, or if water valve (Riviera) is not closed.
5. Touch "BI-LEVEL" and observe air flow split between A/C and heater outlets. If it doesn't LED's will flash. Blower speed should not change.
6. Select "AUTO-LO" setting. Blower speed should gradually decrease to low. Recirculation door will position itself to let air enter system from outside. If not, LED's will flash on Electra, LeSabre and Riviera models.
7. Touch "85°"and "DEF". Blower speed will increase to high and air will be hot. If not, LED's should flash. Defrost door goes from bleed to open. Compressor cycles above 50° ambient temperature.
8. Touch "ECONOMY" and "85°", and note that compressor shuts off while air still comes out of heater.

Note. Diagnosis can be speeded up by using a known good actuator to determine that the circuitry is functioning. Mode actuators are interchangeable for testing purposes, except that defroster door requires its specific actuator.

Blower & A/C Clutch Control Terminals (Illustration shows function of each terminal.). Scheme 5

System Operates Only at Maximum A/C

1. Select "85°" setting. If system remains in maximum A/C, proceed to Temperature Door Actuator. If system goes to heat, check the following: A short in either in-car or ambient temperature sensor. Incorrect sensors. Shorted wiring at connections at sensors. Miscalibrated control panel. NOTE: Control panel should not be recalibrated unless sensors have been changed or panel has been recalibrated earlier.
2. If none of the above conditions exist, proceed to Temperature Door Actuator.

System Operates Only at Maximum Heat

1. Select "65°" temperature setting. If system goes to maximum cool, check the following: An open sensor string - Disconnected in-car or ambient temperature sensor, broken or disconnected wires in sensor wiring system. An incorrect sensor installed or sensor malfunction. Proceed to Sensor.
2. If none of the above conditions exist, proceed to Temperature Door Actuator.

System Does Not Provide Comfort at Control Panel Setting

Check for proper operation or adjustment of the following components

1. Aspirator System - Air flow should hold small piece of paper against in-car temperature sensor grille. If not, check for disconnected hose.
2. Sensor Operation - Be sure in-car sensor box cover is in place. Also see SENSOR.
3. Temperature Actuator Door Rod - Check door rod for sticking or binding.
4. Temperature Actuator Door and Rod Calibration - Check calibration by watching door movement. It should move toward front of car. Choose "85°" setting. The arm should rotate at least 180°. If out of adjustment, LED's will flash at "65°" or "85°" position.

Mode Actuator (Regal & Skyhawk)

Note. Engine must be running, battery must be fully charged, and system must be receiving at least 10 volts during this check.

1. If mode actuator will not move, check for vacuum at port 5 of vacuum connector at programmer. Check for 12 volts at pin F of programmer. If either voltage or vacuum is missing, check vacuum and wiring harness.
2. If air flow to 2 or more actuators is incorrect, check vacuum connections at programmer, using vacuum diagram. Check for proper electrical connection at programmer.
3. If problem still exists, check lower mode actuator. Disconnect Red vacuum hose from heater side. Select "85°" and "AUTO" settings. If vacuum is present proceed with next step. If not, proceed to step 6).
4. Disconnect Yellow vacuum hose at A/C side. If vacuum is present, proceed to step 10). If no vacuum is present, replace hose and proceed to next step.
5. Select "65°" setting. If no vacuum is present at Red hose on heater side, check programmer. If vacuum is present at Red hose, check lower mode door for obstructions. If none, replace mode actuator. If vacuum is now present, proceed to step 7).
6. Using a voltmeter, check voltage at programmer pin D Regal) or pin E (Skyhawk). If voltage is more than 8 volts, proceed to step 8). If less than 8 volts, substitute a known good programmer.
7. Repeat voltage check in step 6). If voltage is now greater than 8 volts, install new programmer. If still less than 8 volts, proceed to step 9).
8. Check voltage at pin 4 (Regal) or at pin E (Skyhawk) of control panel 22-pin connector. To do so, insert probe through rear of connector. If voltage is more than 2 volts, replace control unit.
9. If less than 2 volts, check wiring and connections between pin D of programmer and pin 4 of 22-pin connector (Regal) or pin E of programmer and pin E of 22-pin connector (Skyhawk).
10. If in step 7) voltage was less than 8 volts, check voltage at pin 4 (Regal) or at pin E (Skyhawk) of control panel's 22-pin connector. To do so, insert probe through rear of connector. If voltage is less than 2 volts, replace control panel.
11. If more than 2 volts, check wiring and connections between pin D of programmer and pin 4 of 22-pin connector (Regal) or pins E of programmer and pin E of 22-pin connector (Skyhawk).
12. Check voltage at programmer pin B (Regal) or pin D Skyhawk). If it is greater than 8 volts, replace the programmer. If less than 8 volts, check voltage at pin 3 (Regal) or pin 7 (Skyhawk) of 22-pin connector.
13. If voltage is less than 2 volts, replace control panel. If voltage is more than 2 volts, check electrical connections and wiring between programmer pin 3 and pin B of 22-pin connector (Regal) or between programmer pin 7 and pin D of 22-pin connector (Skyhawk).
14. If the air flow from any of the other actuators is incorrect, disconnect vacuum hoses from actuators and follow the procedures outlined. If more than 1 actuator is suspected, work on each separately.
15. Select "65°" and "AUTO" setting. If no vacuum is present at hose to particular actuator, proceed to step 17). If vacuum is present, select "85°" and "AUTO" settings.
16. If vacuum is still missing at hose to particular actuator, check mode door for obstructions. If no obstructions are found, replace appropriate actuator. If vacuum is now present proceed to step 18).
17. Check voltage at appropriate pin on programmer. If voltage is less than 8 volts, replace programmer. If greater than 8 volts, proceed to step 19).
18. Check voltage at appropriate pin on programmer. If voltage is less than 8 volts, proceed to step 20). If voltage is more than 8 volts, replace programmer.

PROGRAMMER INDEXING

PROGRAMMER ELECTRICAL INDEXING

1. Check voltage at appropriate pin in 22-pin control panel connector. If voltage is less than 2 volts, check electrical connections and wiring between control panel and programmer. If voltage is more than 2 volts, replace control panel.
2. Check voltage at appropriate pin in 22-pin control panel connector. If voltage is more than 2 volts, check electrical connections between control panel and programmer. If less than 2 volts, replace control panel.

Scheme 6

1. Use air flow to determine which mode actuator is malfunctioning. Check electrical connection to faulty actuator. Check actuator after touching LED (restores power for 20-second period). If motor runs more than 15-20 seconds, proceed to step 16). NOTE: Electrical problems with either mode or temperature actuator circuits will flash LED on panel - whether problem is with actuator, control panel, or wiring. Conduct functional tests prior to diagnosis.
2. Actuator will either be inoperative (See step 3)), stop at incorrect position (See step 12)), or stop at correct position but door will fail to seal (See step 15)). Test with known good actuator. NOTE: Any actuator will work except those for defrost door or Riviera mode door. These require specific units. Actuators are interchangeable ONLY for testing, not for normal operation. Also, 2-position actuators cannot be used to check 3-position actuators.
3. If actuator was inoperative when flashing LED was pushed, turn ignition "ON". Attach positive voltmeter lead to actuator pin C and ground. If voltage is 8 volts or more, proceed to step 7). If less than 2 volts, proceed to step 9). If voltage was between 2 and 8 volts, proceed to next step.
4. Check for bad connections between battery and fuse block, fuse block and pin B of control panel 22-pin connector, or pin C of 22-pin connector and actuator. (Scheme 6): Typical Mode Actuator Terminal Identification
5. Also check for malfunctioning diode in control panel. To do so, check voltage-in reading at pin B and voltage-out reading at pin C of 22-pin connector. If more than 1-volt difference, diode is malfunctioning. Replace control panel.
6. If voltage difference is 1 volt or less, but voltage at pin B is less than 8 volts, check battery charge and connections. If voltage difference is correct, but pin C voltage was less than 8 volts, replace control panel.
7. If more than 8 volts were indicated in step 3), attach voltmeter to actuator pins A and C. Touch flashing mode LED on panel, and observe voltmeter reading.
8. If voltage was 8 volts or more, check for obstruction of links or mode doors. Also check for stripped actuator gears. If no problems are found, replace actuator. Be sure control panel shuts off power after 20 seconds when a malfunction occurs. If voltage indicated in step 7) was less than 2 volts, proceed to step 11).
9. If voltage in step 3 was less than 2 volts, connect voltmeter positive lead to pin C of 22-pin connector (ignition voltage source for all actuators). Connect negative lead to ground. Check voltage.
10. If reading is more than 8 volts, wire from pin C is shorted, broken, or has poor connection. If less than 2 volts is indicated, replace control panel.
11. If voltage in step 7) was less than 2 volts, connect voltmeter leads to pin C of 22-pin connector and actuator wire connector terminal A. Touch flashing LED and check voltage. If voltage is 8 volts or more, check continuity of wires. If less than 2 volts, replace control panel.
12. If in step 2) the actuator stopped at incorrect position, turn ignition "ON" and check for flashing mode LED. Attach a voltmeter to actuator pins A and D. Touch flashing mode LED and check voltage.
13. Voltage should cycle between 11 volts and 5 volts (11 volts, 5 volts and 4 volts for 3-position defrost door actuator or Riviera 4-position mode door).
14. If so, check continuity of wire connecting actuator pin C to control panel 22-pin connector. If continuity exists, replace actuator. If in step 13) no voltage change occurred, replace actuator. If voltage changes occurred, but were not within specifications, replace control panel. NOTE: Be sure to use proper actuator, as they are not interchangeable.
15. If in step 2) the actuator stopped at the correct position, but door was in incorrect position, check door link attachments and assembly to actuator. Check actuator adjustment, making sure actuator arm is in correct position based on control panel setting.
16. If in step 1) the motor runs more than 15-20 seconds, turn ignition "OFF" and remove connector from actuator. Using a self-powered test light, check continuity from actuator pin A to ground.
17. If test light lights, there is a short in harness. If it does not light, check continuity of wire from actuator pin D (signal connection) to control panel 22-pin connector. If wire is OK (test light lights), replace actuator. If wire is open or grounded (light does not light), repair harness.

Scheme 7

Scheme 8

1. If temperature actuator sub-system is suspected, inspect actuator arm for obstructions. Check door rod for binding and proper adjustment. Check electrical connections to actuator. (Scheme 7): Temperature Actuator Terminal Identification (Riviera model is illustrated.) (Scheme 8): Temperature Actuator Terminal Identification (Electra and LeSabre models are illustrated.)
2. If no problems are found, apply 12 volts across terminals A and B of actuator for 2-3 seconds. Note actuator arm movement. Then reverse leads to terminals A and B for 2-3 seconds. Again note actuator arm movement.
3. If arm moves both ways, drive circuit is OK. Proceed to next step. If actuator runs, but arm fails to move, gears within actuator are stripped. Replace actuator.
4. Using an ohmmeter, check resistance between actuator terminals C and D. At 68-86°F resistance should be 1,100 ohms. If correct, proceed to next step. If ohmmeter reads infinite, suspect a broken resistor strip. Replace actuator.
5. Apply 12 volts to actuator terminals A and B. Drive arm to calibration point and take resistance reading. Reading should be 670 ohms. If not, a feedback circuit failure requires actuator replacement. NOTE: On Regal and Skyhawk models, take resistance reading at terminals A and B; on Electra and LeSabre, terminals C and F; and on Riviera, terminals D and F.
6. Check continuity of electrical wiring and connections between actuator and control panel. If continuity is OK, replace control panel.

CLUTCH CONTROL

Note. If clutch does not engage above 50-55°F, first check compressor clutch diode, and then begin diagnosis. Engine should be running. Control panel LED should be lit in "A/C", "BI-LEVEL", or "DEFROST" mode.

1. Connect voltmeter between compressor clutch output pin 5 and ground. If 8-10 volts are present, suspect malfunctioning clutch or pressure switch or a poor ground.
2. If 0 (zero) volts is read, connect voltmeter between clutch control input pin 4 and ground. If 8-10 volts are present, proceed to next step. If 0 (zero) volts, are indicated, proceed to step 5).
3. Connect a voltmeter between ignition feed pin 3 and ground. If 8-12 volts is read proceed to next step. If less than 8 volts, check continuity of ignition wire between control and control panel. Repair or replace, as necessary.
4. Short out pressure switch connector terminals. If clutch engages, either R-12 charge is low or pressure switch is inoperative. If clutch does not engage, blower and clutch control is inoperative.
5. Connect a voltmeter at control panel pin C of 8-pin connector (pin B of 22-pin connector on Skyhawk) and to ground. If 8-12 volts is read, a poor connection or broken wire is at fault. If meter reads less than 8 volts, replace control panel

Scheme 9

1. If an ambient or in-car temperature sensor is suspected, disconnect sensor, and take a resistance reading across sensor terminals. If resistance reading is not with 5% of ideal curves indicated in graph, replace sensor. (Scheme 9) (Scheme 9): Checking Sensor Resistance Readings (Resistance may vary by 5% from ideal (10% on Riviera).)
2. If resistance is within specification, check continuity of wires from control panel to sensors. If wires are OK, control panel is defective.

Regal Model Only

1. This procedure requires an 18,000-ohm resistor with 5% tolerance and a digital voltmeter capable of 1/100th volt readings J-29125A or BT-2815). Remove control panel from instrument panel. In engine compartment, disconnect ambient temperature sensor, and short across terminals of its connector (in A/C wiring harness at A/C module).
2. Disconnect in-car temperature sensor from instrument panel wiring harness. Place 18,000-ohm resistor across terminals of instrument panel harness connector for in-car sensor.
3. Turn ignition on, and set system for "75°" and "AUTO". Connect positive lead of digital voltmeter to cavity L of 22-pin connector. Connect negative lead to ground. Record reading.
4. Connect voltmeter between cavity 1 of 22-pin connector and ground. Remove tape over control head calibration hole. Place screwdriver into hole so it slips into adjustment screw in circuit board.
5. Multiply voltage recorded at cavity L by .288. Turn screwdriver until cavity 1 voltage reaches this figure (cavity L voltage multiplied by .288).
6. Remove 18,000-ohm resistor, reconnect in-car and ambient temperature sensors, and reinstall control panel in instrument panel.

System Response - Electra & LeSabre. Scheme 10

System Response - Riviera. Scheme 11

System Response - Regal. Scheme 12

System Response - Skyhawk. Scheme 13

COMPONENT REPLACEMENT

Note. Disconnect battery before replacing any component.

Replacement

1. Remove instrument panel trim plates and screws from control. Pull control out from instrument panel, and disconnect electrical connectors.
2. If replacing light, remove 4 screws from front and 2 screws from bottom of panel. Carefully push on electrical prongs at rear of control assembly. Slide assembly out of case.
3. Remove top or bottom bulb by pulling out on circuit board. To install, carefully slide circuit board into case within guide tracks. (Scheme 14) Replace control, screws, and trim panel.

Installing Circuit Board in Control Assembly (Slide circuit board into guide tracks.). Scheme 14

1. Remove right instrument panel sound absorber panel, glove compartment door and compartment, trim plate above glove compartment, right A/C grille and duct. Remove screws, attaching actuator and bracket to recirculation housing, and unplug electrical connector.
2. Lift actuator up and work it off of recirculation door. To install, transfer linkage, mounting bracket, and sound deadener cover to new actuator. Reverse removal procedures. (Scheme 15)

Heater and A/C Case Assembly Showing ETCC Components (Electra, LeSabre, & Regal). Scheme 15

1. Remove instrument panel sound absorber panels, cross-car duct, and heater floor outlet. Remove screw through opening at right of heater outlet opening, and take off heater floor baffle. Remove transmission kick-down switch.
2. Working through heater outlet opening, remove door link retainers. Remove 2 screws in forward surface of heater outlet opening. Insert a punch, and push straight forward to free actuators and mounting bracket from locating studs.
3. Pull assembly to left, and remove from housing. To ensure mating with proper actuator, note different colored wires prior to disconnecting connectors.
4. To install, transfer door links and retaining clips, sound reducer covers, from old to replacement actuator. Install electrical connectors, ensuring that color matches correct actuator.
5. Position actuator in approximate same position as removed, and work linkages through slots in foam seals on mode doors. Install actuator bracket over positioning studs on surface of case.
6. Screw holes in front surface of case will align with holes in mounting bracket, when bracket is suspended on studs. Install screws into case and mounting bracket. Install linkages over pins on upper and lower mode doors, and install retainers.
7. Temporarily connect battery. Switch modes, and observe doors for binding and adequate sealing. Inspect link seals on front of heater for position and condition, and replace as necessary. Continue installation in reverse order of removal.

1. Actuator or water valve may be removed separately. To remove actuator, select "85°" position prior to disconnecting battery. This will position valve and actuator in open position.
2. Remove electrical connector and screws, and remove actuator. To install, reverse removal procedures.

1. Remove right instrument panel sound absorber panel, glove compartment door, and compartment. Remove trim plate above glove compartment, right A/C grille and duct.
2. Disconnect aspirator hose from assembly, and unsnap temperature door rod from actuator. Disconnect electrical connector, and remove 3 screws attaching bracket assembly to A/C case. Remove actuator from bracket, and transfer sound deadener cover to new actuator.
3. To install, reverse removal procedures. However, before installing temperature door rod, connect battery, and touch "85°" on the control panel. This drives system to maximum heat position. Pull rod toward inside of car, and snap in place.

1. Remove left instrument panel sound absorbers and cross-car duct. Remove heater floor outlet, and disconnect transmission kick-down switch connector. Remove defroster door link retainer and spring.
2. Remove 2 screws retaining actuator bracket to case, and remove assembly. Disconnect electrical connector, remove bracket, and transfer parts to new actuator. To install, reverse removal procedures.

1. Remove screws from instrument panel pad, and remove pad. Disconnect wire connector and hose from sensor, and remove from panel. (Scheme 16)
2. On some models, it may be necessary to release locking latches on sensor, as sensor is pulled out of instrument panel carrier. To install, reverse removal procedure.

Location of In-Car and Ambient Sensors and Aspirators (Ambient sensor location is typical, varying by models.). Scheme 16

Remove hood seal from lip of A/C module. Remove screw nearest ambient sensor) from leak screen. Disconnect electrical connector, and remove ambient sensor. (Scheme 16) To install, reverse removal procedures.

Regal Electronic Touch Climate Control Vacuum Diagram. Scheme 17

Skyhawk Electronic Touch Climate Control Vacuum Diagram. Scheme 18

Regal Electronic Touch Climate Control Wiring Diagram. Scheme 19

Electra & LeSabre Electronic Touch Climate Control Wiring Diagram. Scheme 20

Skyhawk Electronic Touch Climate Control Wiring Diagram. Scheme 21

Riviera Electronic Touch Climate Control Wiring Diagram. Scheme 22