HVAC actuator recalibration


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2004 Chevy Suburban – HVAC Actuator Recalibration

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Filed Under (Chevrolet) by admin on 20-10-2010

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Actuator Recalibration When replacing the HVAC control module it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC control module be sure to perform the following: Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result. 1. 2. 3. 4. 5. 6. 7. Place the ignition switch to the OFF position. Disconnect the scan tool. Install the HVAC control module. Connect all previously disconnected components. Start the vehicle. Wait 40 seconds for the HVAC control module to self-calibrate. Verify that no DTCs have set as current DTCs. When replacing the HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC actuator be sure to perform one of the following: Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result. Preferred Method (w/ Scan Tool) Clear all DTCs. Place the ignition switch in the OFF position. Install the HVAC actuator. Connect all previously disconnected components. Start the vehicle. With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu. 7. Verify that no DTCs have set as current DTCs. Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self- calibrating. If interrupted, improper HVAC performance will result. 1. 2. 3. 4. 5. 6. Alternate Method (w/o Scan Tool)

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2004 Chevy Suburban RECIRCULATION ACTUATOR REPLACEMENT (VISTEON)

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Filed Under (Chevrolet) by admin on 05-07-2010

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RECIRCULATION ACTUATOR REPLACEMENT (VISTEON) REMOVAL PROCEDURE 1. Remove the HVAC module assembly. 2. Remove the screws from the evaporator core cover (1). 3. Remove the evaporator core cover (1) from the HVAC module assembly (2). 4. Remove the screws from the recirculation actuator (1). 5. Remove the recirculation actuator (1) from the HVAC module assembly (2). INSTALLATION PROCEDURE 1. Install the recirculation actuator (1) to the HVAC module assembly (2). 2. Install the screws to the recirculation actuator (1). NOTE: Refer to Fastener Notice in Service Precautions. Tighten the screws to 2 N.m (18 lb in) . 3. Install the evaporator core cover (1) to the HVAC module assembly (2). 4. Install the screws to the evaporator core cover (1). Tighten the screws to 2 N.m (18 lb in) . 5. Install the HVAC module assembly. 6. Reprogram the recirculation actuator. Refer to Re-Calibrating Actuators, See: Testing and Inspection\Programming and Relearning\Actuator Recalibration – HVAC

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2003 Mazda 6 AIRFLOW MODE ACTUATOR INSPECTION

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Filed Under (Mazda) by admin on 06-12-2010

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Full-auto Air Conditioner 1. Connect battery positive voltage to terminal E or F and ground to terminal F or E of the airflow mode actuator. 2. Verify that the airflow mode actuator operates as shown. If not as specified, replace the airflow mode actuator. 3. Verify that the resistance between the terminals of the airflow mode actuator is as shown in the graph. If not as specified, replace the airflow mode actuator. Manual Air Conditioner Operating inspection 1. 2. 3. 4. 5. Turn the fan switch to OFF. Turn the mode dial to VENT. Turn the ignition switch to ON position, (engine ON) Turn the fan switch 4th position. Turn the mode dial from VENT to DEFROSTER. 6. Verify that the airflow mode actuator moves smoothly. If not as specified, inspect the airflow mode main link and sub link for clogging and deformity. If the actuator cannot move at all, go to voltage inspection. Voltage inspection 1. Disconnect the airflow mode actuator connector. 2. Turn the ignition switch to ON position, (engine OFF) 3. Verify that the voltage between the terminals of airflow mode actuator (harness-side) is as shown in the table. If not as specified, perform the harness inspection and mode switch inspection. (See CLIMATE CONTROL UNIT INSPECTION, Manual Air Conditioner.) If as specified, replace the airflow mode actuator.

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1997-1999 Buick Century (Replace HVAC Controller, Splice into Backlighting Circuit)

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Filed Under (Buick) by admin on 18-11-2010

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temperature variation between the left and right hand ducts. Typical concerns may include that the right side of the vehicle cools down but the left stays warm or the opposite. This condition is sometimes associated by the customer with a recent service visit for other non-related repairs. The codes, DTC B0361 or B0441, may be present but will not illuminate a telltale lamp. The HVAC controller unit and the TEMP door actuator motors rely on a feedback system that supplies the controller with count values in order to accurately adjust the air temperature. When battery power is interrupted to the HVAC controller, the current actuator position values are lost. When power is restored, the controller will perform a “sweep test” of the doors from full cold to full hot and record the end values for reference. Over time, the TEMP doors may develop some flexing when run to their extremes. This flexing allows the count values to run out of range (beyond 0-255) and results in DTC code B0361 or B0441 to set. A revised HVAC controller has been released with new programming that allows for a wider tolerance in the expected range of the TEMP door. Replace the controller using the procedure below: Important: On the 1997 Buick Century and Regal, additional steps are required. You will have to run a jumper wire to the new HVAC controller. Be sure to follow the additional 1997 model year steps below. 1. Disconnect the negative battery cable. Important: On the Buick Regal, the console must first be removed to access the HVAC controller. For Buick Century and Oldsmobile Intrigue, skip to Step 10. Apply the parking brake and block wheels. Shift the transmission to first gear. Remove the console trim plate and disconnect the electrical harness. Disconnect the cigarette lighter sockets. Remove the console storage box. Remove the console control plate and disconnect electrical harness for traction control and heated seats, if equipped. 8. Remove the console retaining bolts. 9. Remove the console from the vehicle. 10.Remove the HVAC trim panel, if equipped. 11.Remove the HVAC controller retaining bolts. 12.Disconnect the electrical harness. 13.Discard the HVAC controller.

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1999 Cadillac DeVille Air Mix Actuator Replacement – Driver REMOVAL PROCEDURE

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Filed Under (Cadillac) by admin on 31-10-2010

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REMOVAL PROCEDURE 1. 2. 3. 4. 5. 6. 7. Remove the right sound insulator. Remove the instrument panel compartment. Unsnap the rod from the plastic retainer on the actuator arm. Remove the two screws from the actuator (2). Disconnect the electrical connector (1). Remove the actuator (2). Inspect the air mix door for free travel. INSTALLATION PROCEDURE IMPORTANT : After replacing the actuator (2), recalibrate the actuator (2) for proper travel. Cycle the ignition ON for 3 minutes to allow the programmer and the actuator (2) to recalibrate for proper travel. 1. Install the actuator (2). 2. Connect the electrical connector (1). NOTE : Refer to Fastener Notice in Service Precautions. 3. Install the two screws to the actuator (2). Tighten Tighten the screws to 1.2 N.m (12 lb in) . 4. Snap the rod to the plastic retainer on the actuator arm. 5. Install the instrument panel compartment. 6. Install the right sound insulator.