diagram of hvac system in 2000 silverado
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Filed Under (Chevrolet) by admin on 20-10-2010
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)
Filed Under (Chevrolet) by admin on 11-08-2010
Remove the HVAC module. 2. 3. 4. 5. Disconnect the electrical connector (3) from the mode actuator (4). Remove the screws from the mode actuator (4). Remove the mode actuator (4) from the HVAC module (1). Remove the wiring harness from the air distribution housing (1). 6. Remove the screws from the air distribution housing (1). 7. Remove the air distribution housing (1) from the HVAC module (2). 8. Remove the screws from the upper recirculation housing (1). 9. Remove the upper recirculation housing (1) from the HVAC module (2). 10. Remove the screws from the lower recirculation housing (1). 11. Remove the lower recirculation housing (1) from the HVAC module (2). 12. Remove the wiring harness from the HVAC module. 13. Remove the screws from the HVAC module. 14. Remove the upper HVAC module case (1) from the lower HVAC module case (2). 15. Remove the right temperature door (2) from the upper HVAC module case (1). INSTALLATION PROCEDURE
Filed Under (Buick) by admin on 18-11-2010
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.
Filed Under (Honda) by admin on 12-10-2010
SYMPTOM The audio display and controls (knobs, buttons, bars) of the audio-HVAC display module are dim or are dark. PROBABLE CAUSE Faulty audio unit. VEHICLES AFFECTED NOTE: Affected vehicles do not have the navigation system. 2003 Accord (except DX models and LX L4 models): ALL CORRECTIVE ACTION Replace the audio unit. Refer to S/B 98-019, Audio Unit In-Warranty Exchange/Out-of-Warranty Repair. If a customer calls ahead to schedule an appointment, and the vehicle is in the affected VIN range, order the remanufactured audio unit right away so it is available when the customer comes in. 3. Remove the audio-HVAC display module (see page 22-289 of the 2003–04 Accord Service Manual). (In ISIS, use the keyword DIS MOD, and select Audio- HVAC Display Module Removal/Installation from the list.) 4. Remove the faulty audio unit from the audio-HVAC display module (see page 22-290). (In ISIS, use the keyword DIS PAN, and select Audio-HVAC Display Panel Removal/Installation from the list.) 5. Transfer the left and right brackets from the faulty audio unit to the remanufactured audio unit. If the remanufactured unit has a shipping cover and shipping screws, make sure you transfer them to the faulty unit being returned. 6. Install the remanufactured audio unit in the audio- HVAC display module. Then reinstall the audio- HVAC display module. 7. Enter the anti-theft code for the new audio unit. Enter your customer’s radio station presets if you recorded them in step 2. 8. Make sure all of the functions of the audio unit and HVAC work properly.
Filed Under (Jeep) by admin on 17-08-2010
Housing Assembly HVAC: Service and Repair The heater-A/C housing assembly must be removed from the vehicle and the two halves of the housing separated for service access of the heater core, evaporator coil, blend-air door(s), and each of the various mode control doors. WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY. REMOVAL 1. Disconnect and isolate the battery negative cable. 2. Remove the instrument panel from the vehicle. Refer to: Body and Frame, Interior Trim, Dashboard/Instrument Panel, Service and Repair, Instrument Panel Service Procedures, Instrument Panel Assembly Replacement, See: Body and Frame/Interior Moulding / Trim/Dashboard / Instrument Panel/Service and Repair/Instrument Panel Service Procedures/Instrument Panel Assembly Replacement 3. Recover the refrigerant from the refrigerant system. See: Refrigerant/Service and Repair 4. Disconnect the liquid line refrigerant line from the evaporator inlet tube See: Hose/Line HVAC/Service and Repair. Install plugs in, or tape over all of the opened refrigerant line fittings. 5. Disconnect the suction line refrigerant line from the evaporator outlet tube See: Hose/Line HVAC/Service and Repair. Install plugs in, or tape over all of the opened refrigerant line fittings. 6. Disconnect the heater hoses from the heater core tubes. Clamp off the heater hoses to prevent loss of coolant. Install plugs in, or tape over the opened heater core tubes. 7. If the vehicle is equipped with the manual temperature control system, unplug the heater-A/C system vacuum supply line connector from the tee fitting near the heater core tubes. 8. Remove the coolant reserve/overflow bottle from the passenger side inner fender shield. 9. Remove the Powertrain Control Module (PCM) from the passenger side dash panel in the engine compartment and set it aside. Do not unplug the PCM wire harness connectors.