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Old 11-08-2010, 09:33 PM
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azc has no heat

hey guys, sorry if there is already a thread on this... but I got an issue with the azc. I got plenty of air flow, but no heat. Auto and manual both work to control airflow, but there just isnt much range in temp... it gets kinda warm, and kinda cool, but nothing real definite either way... Any ideas?

99 WJ Ltd. 4.7l
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Old 11-08-2010, 09:56 PM
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Re: azc has no heat

is your thermostat ok?

its purpose is to make the coolant keep a constant temp of qbout 200 degrees.

if it never heats up then you wont ever get any heat/
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Old 11-08-2010, 09:57 PM
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Re: azc has no heat

http://www.wjjeeps.com/climate.htm
Blower Motor issue - it's friggen cold! Help!
These should help Jer. Bookmark the WJ Jeeps site there's lots of useful info on there.
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Old 11-09-2010, 12:48 AM
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Re: azc has no heat

jeep runs at 210....
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Old 11-09-2010, 12:59 AM
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Re: azc has no heat

Quote:
Originally Posted by cheapjeep View Post
http://www.wjjeeps.com/climate.htm
Blower Motor issue - it's friggen cold! Help!
These should help Jer. Bookmark the WJ Jeeps site there's lots of useful info on there.
thanks, i knew about that site but didn't know it was so detailed...
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Old 11-09-2010, 06:48 AM
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Re: azc has no heat

Blend door problem.
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Old 11-09-2010, 08:51 AM
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Re: azc has no heat

yep! I'm gonna suggest its the bend doors too. As you can tell, I have a thread regarding similar issues.

Do you have even air flow on both the passenger side and the divers side?

My drivers side centre console vent blows hard, so does the defrost on the dash, all the other vents are weak. I have heat on the passenger side but none on the drivers side. When I get the chance, I will drop the glove box and have a look at the blend doors on the drivers side as well as the actuator.
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Old 11-09-2010, 01:33 PM
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Re: azc has no heat

air flow seems pretty even on both sides, just seems like there isn't much heat. I will do the recalibration in a few minutes and see...
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Old 11-09-2010, 05:00 PM
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Re: azc has no heat

Does your car have the automatic zone control system? In that case the problem would be with both blend doors/actuators. The problem could also be with the heater core.
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Old 11-09-2010, 05:14 PM
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Re: azc has no heat

Just saw now that the title mentioned AZC .
Quite strange tough that you don't get much heating nor cold air. When the blend doors are stuck closed, you probably won't get heat, but airco should still be ok in that case. Regarding the cold air, are you sure that the airco system is charged to the right pressure?
Do you hear the blend doors moving when you change the temperature settings?
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Old 11-09-2010, 06:44 PM
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Re: azc has no heat

see what codes you get by

AZC self-diagnostic mode: 1. To enter the self-diagnostic mode, 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 there are no fault codes, the “00” display value will remain in the VF window. Should there be 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.


and post them
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Old 11-10-2010, 03:50 AM
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Re: azc has no heat

didn't try reading the codes since i did the recalibration, but i had gotten 52, 54, and 56. There still isn't much heat, airflow is plenty strong and feels pretty even. But, i did realize the ac isn't charged. I had forgotten that it hadn't been charged since the engine swap since I don't ever use it, so therefore didn't notice it wasn't working. Does the ac have to work for the heat to work???
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