Is this a dual zone auto temp? Or manual? One has a blower motor speed controller(auto) and the other has a resistor(manual).
See if there are any codes stored in the eatc this way:
Electronic automatic temperature control module on-demand self-test the eatc module on-demand self test will retrieve on-demand (hard fault) dtcs only, it will not retrieve continuous dtcs. Continuous dtcs can be cleared when exiting the eatc module on- demand self test. Make sure to retrieve continuous dtcs by carrying out the electronic automatic temperature control module - retrieve continuous dtcs procedure before clearing any continuous dtcs. à   the eatc module on-demand self test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A diagnostic tool must be used to retrieve these concerns. à   the eatc module on-demand self test will detect concerns in the system control functions and will display on-demand (hard fault) dtcs for concerns that are present during the self-test. The vehicle interior temperature should be between 4à °-38à °c (40à °-100à °f) when performing the self-test. If the temperatures are not within the specified ranges, false dtcs may be displayed. à   the self-test can be initiated after cycling the ignition switch from off to on. Normal operation of the climate control system stops when the self-test is activated. à   to enter the self-test, press the off and floor buttons simultaneously and release, then press the auto button within 2 seconds. The display will show a flashing blower icon for 20 seconds, after which all vacuum fluorescent segments will be displayed if there are no on- demand dtcs present. If dtcs are present the eatc module will display "00 00" and then on-demand dtcs. Record all dtcs displayed. à   if any dtcs appear during the self-test, carry out the diagnostic procedure. Refer to the electronic automatic temperature control module diagnostic trouble code index and follow the action for each dtc given. à   if a condition exists but no dtcs appear during the self-test, go to symptom chart condition: the eatc system is inoperative, intermittent or incorrect operation. à   to exit the self-test and retain all continuous dtcs, press any button except defrost. The eatc module will exit the self-test and retain all continuous dtcs. à   to exit the self-test and clear all continuous dtcs, press the defrost button. The eatc module will exit the self-test and all continuous dtcs will be cleared. à   always exit the self-test before powering the system down (system turned off). Once the self- test is exited the ignition switch must remain on for at least 30 seconds to allow the temperature blend door actuators to automatically recalibrate. à   continuous dtcs will be deleted after 80 ignition switch on cycles after the intermittent fault occurs. Electronic automatic temperature control module - retrieve continuous dtcs the eatc module will retrieve only continuous (intermittent) dtcs when carrying out this procedure. à   retrieval of continuous dtcs can be initiated after cycling the ignition switch from off to on. Normal operation of the climate control system stops when retrieving continuous dtcs. à   to retrieve continuous dtcs, press the off and panel buttons simultaneously and release, then press the auto button within 2 seconds. All vacuum fluorescent segments will bedisplayed if there are no continuous dtcs present. Continuous dtcs are indicated by the presence of the degrees celsius symbol (à °c) on the eatc module display. Record all dtcs displayed. à   if any dtcs appear, carry out the diagnostic procedure. Refer to the electronic automatic temperature control module diagnostic trouble code index and follow the action for each dtc given. à   if a condition exists but no dtcs appear, go to symptom chart condition: the eatc system is inoperative, intermittent or incorrect operation. à   to exit and retain all continuous dtcs, press any button except defrost. The eatc module will exit the retrieve continuous dtcs mode and retain all continuous dtcs. à   to exit and clear all continuous dtcs, press the defrost button. The eatc module will exit the retrieve continuous dtcs mode and all continuous dtcs will be cleared. à   always exit the procedure before powering the system down (system turned off). Once the procedure is exited the ignition switch must remain on for at least 30 seconds to allow the temperature blend door actuators to automatically recalibrate. à   continuous dtcs will be deleted after 80 ignition switch on cycles after the intermittent fault occurs. Electronic automatic temperature control (eatc) module cold boot process the purpose of the cold boot process is to allow the eatc module to re-initialize and calibrate the actuators. To carry out the cold boot process, follow the steps below. 1. Turn the ignition switch to the off position. 2. Disconnect the eatc module electrical connectors. 3. Wait one minute. 4. Connect the eatc module electrical connectors. 5. Turn the ignition switch to the on position. 6. Select any position except off on the eatc or emtc module. The eatc module will now initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 seconds. Diagnostic trouble code index electronic automatic temperature control (eatc) module diagnostic trouble code (dtc) index note: some pcm dtcs may inhibit air conditioning (a/c) operation. If any pcm dtcs are retrieved, diagnose those first. Refer to the introduction - gasoline article. Note: all dtcs can be retrieved as an on-demand (hard fault) or continuous (intermittent fault) fault. If a continuous (intermittent) fault, the degrees celsius symbol (à °c) will be displayed in addition to the dtcs.
Post any codes and i will look them up, this problem is usually the blower motor speed controller...
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Sunday, January 17th, 2010 AT 10:11 AM
