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Old 12-22-2014, 10:31 PM
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Question heater blend door issues

I would appreciate any help or suggestions on this issue.
I have a 1999 Jeep Grand Cherokee, 4.7 engine dual control and auto for temp settings. The beginning of this summer I replaced the Heater core, the ac evaporator and the blend doors, as well as the accuators for both passenger side and driver side blend doors and accuator for the mode door. I actually took the heater/ac assembly out and did what was hard to get at while it was out. this summer the a/c was great and worked well without a problem. but now this winter I am not getting heat out of driver side all the time. sometimes the blend door for the driver side works but sometimes it won't do anything. when I had the actuator off I could manually turn the part on the door and it moved the door without a problem but the motor wouldn't turn it all the time. I did also replace the ac/heater control in the console and when I did the test everything lights up on the control. the two codes that come up are 54 & 56 which are both "too large travel for the blend doors". I was then told by a mechanic that when you put in new actuators they need to be calibrated by a computer. So I was just at the dealer today and had them put it on the computer, They cleared the codes and calibrated them and they said the codes came right back up. I drove it home and had heat on both side just fine. I went away tonight and it is back to the same thing no heat on the driver side and I cannot hear the actuator trying to do anything. I unhooked the battery tonight and will take the glove box of tomorrow then hook the battery back up and see if I can get the actuator to move. does anyone have any suggestions on what too look for?
also does anyone know the way to have the button sequence to have the system recalibrate itself without having to take it to the dealer again?

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  #2  
Old 12-22-2014, 11:36 PM
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Re: heater blend door issues

This is what I did on my '02 JGC Ltd 4.7HO with dual zone the 4 (yes 4) times I had my dash/steering column out for all this chit. I suffered thru bad (new) actuators, bad (new) heater core, blah, blah.....good luck man, I feel your pain!

Calibrating AZC door actuators

Calibrate the door actuators after making any repairs to the AZC system. To calibrate the door actuators proceed as follows:

1. Turn the ignition on.
2. Set the AZC to automatic.
3. Turn the ignition off.
4. Remove the IOD fuse from the Power Distribution Center. Wait several seconds, and then install the IOD fuse.
5. Turn the ignition on. Do not touch any of the AZC controls for at least one minute to allow the calibration function to run to completion.

Every 20 key cycles the AZC head initiates a re-calibration routine which identifies pulse counts required to achieve full door travel. Also during this routine all modes and functions are validated as functional. When the self calibration routine is complete, the control head resets itself to its last settings.

The air conditioning compressor will engage in certain modes to cool and remove moisture from air entering the passenger compartment. The AZC control, when it is not set in the auto mode, always defaults to A/C enabled. The LED illuminates when the control requests A/C. The customer must toggle A/C off by depressing the button every time he turns to manual mode or the A/C is enabled. Additionally, when the vehicle is off for a "calibratable" amount of time, automatic A/C is again enabled and the customer must again force it off by depressing the button.
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  #3  
Old 12-23-2014, 12:59 PM
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Re: heater blend door issues

Welcome to the garage.
Strange that you still get travel too large codes. The controlhead will remove the power to an actuator after it sees that it is rotating for too long . So that the actuator doesn't move now, does not necessarily mean that the actuator is bad. Did you try to move the blend door by hand after installation of the dash? Does the blend door has stops on both sides?
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Old 12-23-2014, 01:07 PM
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Anything is possible with these actuators.

After my first burn on a bad actuator I used a 9v battery to test them prior to install. Also, if I remember correctly there was a problem the Dormans being wired backwards. Half the Autozone stock was backwards, drove me nuts til I verified it and showed the autozone dudes. They informed Dorman and Dorman to their credit gave me a voucher for $500 in free product. Used it for window regulators, etc...no more of that chit, ponied up for the Maxcare Lifetime this time around.
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Old 12-23-2014, 01:14 PM
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Re: heater blend door issues

Quote:
Originally Posted by Frango100 View Post
Welcome to the garage.
Strange that you still get travel too large codes. The controlhead will remove the power to an actuator after it sees that it is rotating for too long . So that the actuator doesn't move now, does not necessarily mean that the actuator is bad. Did you try to move the blend door by hand after installation of the dash? Does the blend door has stops on both sides?

I can move the door by hand on the one in front. and it has stops on both sides. the one in back I cannot see without taking it back off. But right before I put it on I hooked it up and it moved both ways and had the stops on. I am going to try the calibration on the post right above this and see what happens thanls.
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Old 12-24-2014, 12:15 AM
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Re: heater blend door issues

Ok I just calibrated the actuators and everything was fine when I went to the store. heat everywhere. I come back home and no heat on the driver side again. I looked and the actuator is not trying to move again. I am probably going to take the dash back off, and take the box out and take the doors off to make sure something didn't break inside of the new one just to make sure. I did take the actuator off and turn the knob and you can hear the door hitting the top and bottom. I will also replace the wiring harness just to make sure while I have the box out. but I just really don't know where to go from here so I would appreciate any knowledgeable suggestions. right now it's Christmas time with family so I will start all this Friday.
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Old 12-24-2014, 12:24 AM
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Re: heater blend door issues

Thanks for the info this did calibrate them and that was a answer. Something else must be going on though because I had heat when I went to the store then but when I came back out from the store driver side didn't work again. I'll look at it some more after Christmas stuff going on but for now I just have the glove box off and turn the knob manually.


Quote:
Originally Posted by 14SummitHemi View Post
This is what I did on my '02 JGC Ltd 4.7HO with dual zone the 4 (yes 4) times I had my dash/steering column out for all this chit. I suffered thru bad (new) actuators, bad (new) heater core, blah, blah.....good luck man, I feel your pain!

Calibrating AZC door actuators

Calibrate the door actuators after making any repairs to the AZC system. To calibrate the door actuators proceed as follows:

1. Turn the ignition on.
2. Set the AZC to automatic.
3. Turn the ignition off.
4. Remove the IOD fuse from the Power Distribution Center. Wait several seconds, and then install the IOD fuse.
5. Turn the ignition on. Do not touch any of the AZC controls for at least one minute to allow the calibration function to run to completion.

Every 20 key cycles the AZC head initiates a re-calibration routine which identifies pulse counts required to achieve full door travel. Also during this routine all modes and functions are validated as functional. When the self calibration routine is complete, the control head resets itself to its last settings.

The air conditioning compressor will engage in certain modes to cool and remove moisture from air entering the passenger compartment. The AZC control, when it is not set in the auto mode, always defaults to A/C enabled. The LED illuminates when the control requests A/C. The customer must toggle A/C off by depressing the button every time he turns to manual mode or the A/C is enabled. Additionally, when the vehicle is off for a "calibratable" amount of time, automatic A/C is again enabled and the customer must again force it off by depressing the button.
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Old 12-24-2014, 12:25 AM
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U can use a 9v battery to test movement when you pull dash.
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Old 12-29-2014, 11:36 AM
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Re: heater blend door issues

I checked things this weekend by watching things through the glove box again. the first time I watched the calibration all went well. the I did the controls and the actuator just kept going in a circle instead of stopping when it should have. Both sides are showing as traveling too far so I ordered another blend door. The part wont be here till tomorrow so that is when I will take the dash off and Heater box out. I have to take the old doors out to see what they are doing but it seems that something in the doors broke or came apart.
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Old 12-29-2014, 11:48 AM
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Quote:
Originally Posted by doug2roman View Post
I checked things this weekend by watching things through the glove box again. the first time I watched the calibration all went well. the I did the controls and the actuator just kept going in a circle instead of stopping when it should have. Both sides are showing as traveling too far so I ordered another blend door. The part wont be here till tomorrow so that is when I will take the dash off and Heater box out. I have to take the old doors out to see what they are doing but it seems that something in the doors broke or came apart.
Yep, the shaft split at the end my friend
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Old 12-29-2014, 01:10 PM
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Re: heater blend door issues

the thing that actually irritates me about it is I just put a new door assembly in at the beginning of June. They are going to refund the money nut it still the time. I also looked for a different brand as far as the whole assembly but the only one that I can find is Dorman. I did find the ones that I cut the front of the box out, but I just don't like doing that. anyways I am hoping this one stays together and so forth longer.
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Old 12-29-2014, 01:15 PM
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Quote:
Originally Posted by doug2roman View Post
the thing that actually irritates me about it is I just put a new door assembly in at the beginning of June. They are going to refund the money nut it still the time. I also looked for a different brand as far as the whole assembly but the only one that I can find is Dorman. I did find the ones that I cut the front of the box out, but I just don't like doing that. anyways I am hoping this one stays together and so forth longer.
Feel your pain, had that happen and also when I had to replace heater core at 110k the replacement failed. I had my dash/steering column out 4 times
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