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SUVs Jeep Cherokee and Jeep Grand Cherokee Jeep Grand Cherokee A/C Heating Ventilation
372 messages, Last post on Oct 27, 2009 at 2:04 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee Forum. Your Hosts are steve_ & tidester
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If you have the Automatic Zone Control system (AZC) with the dual control system. Before you do anything else! The first thing you should do is use the AZC fault code system. To read the fault codes: 1. Turn on the ignition switch. 2. Turn on the AZC system. The temperature settings should be displayed for both sides. 3. Simultaneously hold down the AC and the Re-Circ buttons. 4. Then turn the driver’s side temperature (Left) control knob to the right (CW) one click. 5. Then release the AC and Re-Circ buttons. If there are no fault codes, the “00” display value will remain in the window. If there are any codes, each will be displayed for one second in ascending numerical sequence (note: no effort is made to display faults in the order they occurred). The left side set temperature display will be blanked and the right side set temperature display will indicate current and historical codes (8 historical max) presently active. Once all codes have been displayed, the system will repeat the fault code numbers. This will continue until the left side set temperature control is moved at least one detent position in either direction, by pressing both the A/C and Recirc buttons at the same time, or the ignition is turned off. Also describe any symptoms you are having with your heating system. Like - Are you getting a good air flow thru your vent outlets? Can you direct the air flow to the different outlet vents? Post your fault codes and symptoms or send a message to Blen Dor.
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Replying to: blendor (Mar 21, 2009 10:23 am)
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Replying to: msa3 (Mar 21, 2009 2:31 pm) But I am confused with the description “Cold and warm air coming out of the vents at the same time”. Would that be cold air coming out of the vents on one side of the vehicle and warm air coming out of the vents on the other side of the vehicle? The sound of the doors opening and or closing is most likely the actuator motor putting tension onto the blend doors during the calibration process. Briefly, the calibration process happens every 20 ignition cycles, it is the computer finding the location of the two openings, which will let the computer know where to position the blend doors according to the temperature that was set on the display. Does the heating system work good, between the once every few months cold and warm air problem?
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Replying to: blendor (Mar 21, 2009 5:05 pm) This happens when the heater is on, not when the air is on. When it happens all you have to do is turn the ignition off and restart the jeep and the problem corrects itself everythime. Also, when the door opens and closes it continues to happen after you shut the ignition off for awhile.
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Replying to: msa3 (Mar 21, 2009 9:16 pm) The door noise continuing after the ignition is turned off is a normal condition. As there is still current flowing after the ignition is turned off, the computer and other items like the clock, etc. are not controlled by the ignition switch.
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Replying to: blendor (Mar 22, 2009 6:53 am)
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Blend door failure is common on the GC and what you are observing is not unusual. The computer system goes through a calibration routine every twenty times the GC is started to "learn" the position of the blend doors and re-circ door. The creaking and straining noises you are are this calibration routine. The only elements in the GC HVAC system that differentiates between driver's and passenger side are the blend doors and a difference between passenger and driver's is usually an indication of blend door failure. Reading the HVAC codes will give you a definitive diagnosis. The intermittent operation is most likely a symptom of the system in the midst of failing. The doors are not totally broken...yet, but they will get there over time. Sorry for the bad news, but this is a flaw in the system design and replacing the doors is the only option. HeaterTreater
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Replying to: msa3 (Mar 22, 2009 11:58 am) The sounds coming from the dashboard are most likely from the blend door shaft that has partially broken and is now making noises during the calibration process and or just the broken blend door moving during the temperature adjusting process. It sounds like the blend door problem is getting worse and possibly the other blend door will be breaking in the near future. Let me know what happens with cold air from one side and the heat for the other. It sounds like a blend door problem, but if you need more help, Search for the Blen Dor |
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Replying to: heatertreater (Mar 22, 2009 1:47 pm) I believe you indicated this would involve removning the dash. I have done some extensive repairs to my sons BMW in the past with instructions he got off the internet. I am pretty mechanically inclined and have the time to do it as long as I have the step by step process.
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