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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

What is this discussion about? Jeep Grand Cherokee, Heating / Cooling, SUV

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#303 of 372 Grand Cherokee Heater by heatertreater Mar 22, 2009 (1:47 pm)
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 Replies to this message: msa3 (Mar 30, 2009 5:35 am) steve_ (Apr 10, 2009 8:21 pm)
#304 of 372 Re: Read Your AZC Fault Codes [msa3] by blendor Mar 22, 2009 (2:44 pm)
Replying to: msa3 (Mar 22, 2009 11:58 am) As we discussed previously you do have the #54 fault code which is a blend door problem.   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
#305 of 372 Re: Grand Cherokee Heater [heatertreater] by msa3 Mar 30, 2009 (5:35 am)
Replying to: heatertreater (Mar 22, 2009 1:47 pm) Can you provide the parts and procedure if I need to replace the doors and not lose the heat control for the passenger side?   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. Replies to this message: steve_ (Apr 10, 2009 8:21 pm)

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