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Old 02-26-2012, 11:37 AM
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Please advise, Only getting heat on passenger side.

We've been trying to fix an issue with my wife's 03' grand cherokee. We are only getting heat on the passenger side of the vehicle. We did a diagnostic on the atc and advised that the blend door is in need of repair. We took it to a mechanic and they said it needed a new actuator. We purchased one and had it installed. All blend doors were working properly prior to re-assembly of the dash unit but this did not fix the issue. The next step was to replace the ATC and this did not fix the issue. I will try to pull the fuse to see if this might re-calibrate the blend doors but if this doesn't fix the problem what is the next step. I should point out that the heater core obviously is working and we did replace the thermostat as it was bad as well.
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Old 02-26-2012, 12:20 PM
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Re: Please advise, Only getting heat on passenger side.

What codes did you get from the system? Usually its not the actuators, its the blend door inside. Either the stop pin on the end of the shaft breaks or the shaft itself, actually usually both happen in that sequence. If the code says "motor not responding" then I would lean towards actuator, if its "door travel too large" then the problem is a broken shaft.
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Old 02-26-2012, 12:58 PM
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Re: Please advise, Only getting heat on passenger side.

According to the mechanic, there was not identifiable problem with the blend doors.
All were functioning properly on the hinge and no broken parts on any of the blend doors or hinges.
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Old 02-26-2012, 01:39 PM
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Re: Please advise, Only getting heat on passenger side.

At least the drivers side blend door actuator is easily accessable after removing the glove box. You could remove the actuator and see if it moves when selecting a higher and lower temperature.
As Aaron mentioned, which failure code(s) did you get?
If you donīt know how to access the failure mode:

ENTERING THE AZC SELF-DIAGNOSTIC MODE
To enter the AZC self-diagnostic mode, perform the
following:
(1) Depress the a/c and recirc buttons at the same
time and hold. Rotate the left temperature control
knob clockwise (CW) one detent.
(2) If you continue to keep the a/c and recirc buttons
depressed, the AZC control module will perform
a Segment Test of the Vacuum Fluorescent (VF) display.
In the Segment Test you should see all of the
display segments illuminate as long as both buttons
are held. If a display segment fails to illuminate, the
vacuum fluorescent display is faulty and the a/c
heater control must be replaced.
(3) After viewing the Segment Test, release the
A/C and Recirc buttons and the display will clear
momentarily.
If a 0 is displayed, then no faults
are set in the system.
Should there be any faults,
either
currentor historical, all fault codes will be
displayed in ascending numerical sequence (note no
effort is made to display fault codes in chronological
order). Each fault code is displayed for one second
before the next code is displayed. Once all fault codes
have been displayed, the system will then repeat the
fault code numbers. This will continue until the left
side set temperature control is moved at least one
detent position in the CW direction or the ignition is

turned
OFF.
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