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AC not enough cool and temperature remains constant.

Tiny
WUDAAL
  • MEMBER
  • 1999 JEEP GRAND CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 161,000 MILES
I got 47, 54 and 56 upon diagnostics on my Grand Cherokee 1999 limited 4.0L.
the AC blows a bit warm air, and the temperature is same on 22C (84F) and 32C (100F), it looks constant, no change.
Sunday, August 21st, 2011 AT 10:33 AM

13 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You need to have the A/C pressures analyzed using a professional set of gauges with both high and low readings and see what story that tells you.
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Sunday, August 21st, 2011 AT 1:01 PM
Tiny
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  • 37 POSTS
Wrenchtech thank you very much. I collaborated the system and it worked.
Regards
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Sunday, August 21st, 2011 AT 11:04 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You "collaborated" the system? I'm dieing to know what that means.
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Sunday, August 21st, 2011 AT 11:11 PM
Tiny
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  • 37 POSTS
May be I am interpreting it in a wrong way.
Turn on engine, switch AC to auto, turn off engine, open the hood and remove the IOD fuse in the power distribution box for at least 30 seconds, put it back, and turn on engine, the collaboration will start by itself. I did it and it worked for me now the air is cool and the climate control is also functional.
That is what I did. I found it some where on the internet.
Regards
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Monday, August 22nd, 2011 AT 1:18 AM
Tiny
WRENCHTECH
  • MECHANIC
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OH, you "calibrated".
Collaboration is working together to achieve a goal. LOL
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Monday, August 22nd, 2011 AT 1:23 AM
Tiny
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Hahahaha. Yes me and the calibrating technique worked together to fix the problem.
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Monday, August 22nd, 2011 AT 1:29 AM
Tiny
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Hello Wrenchtech, I need your help. As I told you the AC worked well after I COLLABORATED it. When I turn the AC off or restart the engine the AC will not work fine, the climate control will not work then I have to recalibrate it. It works fine. Restart and will not work. Recalibrate and will work. Like this. What do you suggest? Please.
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Tuesday, August 23rd, 2011 AT 11:19 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You might be having a problem with a blend door actuator. It may be returning incorrect position signals back to the control head.
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Tuesday, August 23rd, 2011 AT 11:25 PM
Tiny
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  • 37 POSTS
How can I check this. Can you guide me please?
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Wednesday, August 24th, 2011 AT 12:46 AM
Tiny
WRENCHTECH
  • MECHANIC
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All you can really do is see if it responds to commands from the temp ****.
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Wednesday, August 24th, 2011 AT 12:49 AM
Tiny
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I have to watch the white ****, yes? If yes then; it spins while calibrating it, but does not give any response when adjusting temperature ****.
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Wednesday, August 24th, 2011 AT 8:01 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You're at a stop sign at that point. It could be either the control head or the actuator and it gets highly technical to understand/test which is at fault/ It may require the use of a factory scan tool.
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Wednesday, August 24th, 2011 AT 9:59 AM
Tiny
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I have noticed that the AC works fine, but I can not control the temperature, sometime it blows cold air some time it is just same like surrounding air. I removed the actuator and adjusted the blend doors with the white ****, and now it blows cold air, I did not connect the actuator, so keeping it on cold. Is this a problem with the thermostat or temperature sensor? I have checked the actuator it works fine, and the blend doors also looks fine, at least when I was adjusting the white ****.
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Sunday, August 28th, 2011 AT 1:41 AM

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