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  #13  
Old 07-17-2014, 09:09 PM
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A few weeks ago my climate control fan became unresponsive while driving. I started feeling a bit warm so I went to turn down the temp and nothing happened. Went to manual mode and the fan speed control did nothing. Rebooted the Jeep and it all came back. It only has done it once with about 2300 miles on the clock. I don't have the latest Uconnect firmware so I figure that probably has something to do with it.
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  #14  
Old 07-29-2014, 09:36 PM
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Re: HVAC (AC) after hard acceleration

It happened again! This time driving down the freeway, we started to get warm (89 outside inside set on Auto and 70). I tried the recirculate button with no change. turned the fan on high, made lots of noise and maybe blew a bit more air but not much. We stopped at a rest stop and turned the jeep off and then started back on our way. 10 minutes later same thing. We got home and the Jeep sat for about an hour. We went out to eat and it worked fine again. Its a blend door or something for sure because the air is plenty cold its just not coming out of the vent at the speed the fan is spinning at. Wasn't their something about a plastic gear breaking? could that be it?
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Old 08-01-2014, 05:32 PM
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Re: HVAC (AC) after hard acceleration

I would really not like to take it to the dealer and have them dig around under the dash if a TSB has been issued on this issue.
Update: I was driving back from Tennessee this morning and sure enough after about 4 hours of driving (this time I did not have it on auto I had it on upper vents with AC light on and fan on 3) and the fan speed slowed to almost nothing. I turned the fan up to high and I could hear it working on high but the air coming out of the vents did not change. I tried recirculate and other setting with no change. With the fan on high I turned the ac off and after a minute or less the air coming from the vents got warm and fan speed coming from the vents increased to what I would guess is the high setting. I could duplicate this after about 5 minutes with the AC running normally the air coming out of the vents would decrease again, I would turn the AC off and sure enough the air speed would be consistent with the fan setting.
The problem is it only occurs after 3+ hours of driving.
Anyone have any thoughts? please?
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  #16  
Old 08-01-2014, 11:32 PM
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Re: HVAC (AC) after hard acceleration

Quote:
Originally Posted by BuckeyeSRT View Post
I would really not like to take it to the dealer and have them dig around under the dash if a TSB has been issued on this issue.
Update: I was driving back from Tennessee this morning and sure enough after about 4 hours of driving (this time I did not have it on auto I had it on upper vents with AC light on and fan on 3) and the fan speed slowed to almost nothing. I turned the fan up to high and I could hear it working on high but the air coming out of the vents did not change. I tried recirculate and other setting with no change. With the fan on high I turned the ac off and after a minute or less the air coming from the vents got warm and fan speed coming from the vents increased to what I would guess is the high setting. I could duplicate this after about 5 minutes with the AC running normally the air coming out of the vents would decrease again, I would turn the AC off and sure enough the air speed would be consistent with the fan setting.
The problem is it only occurs after 3+ hours of driving.
Anyone have any thoughts? please?
Sounds like your A/C compressor is freezing up. The ice then blocks airflow. If you turn A/C off the ice starts to melt and when you run the fan airflow speeds up.


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Old 08-01-2014, 11:36 PM
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Re: HVAC (AC) after hard acceleration

Would it unfreeze in less than 30 seconds?


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  #18  
Old 08-01-2014, 11:42 PM
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Re: HVAC (AC) after hard acceleration

Not sure about the time but if the air coming out of the vents gradually increases, it is likely due to the ice melting. If it changes instantly, something else is going on.


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Old 08-01-2014, 11:46 PM
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Re: HVAC (AC) after hard acceleration

When I turn off the AC light with the fan on high it takes about 30 seconds before the fan blows full air again


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  #20  
Old 08-01-2014, 11:52 PM
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Re: HVAC (AC) after hard acceleration

Still think it is freezing up. Take it in to the dealer and explain these symptoms. There may be a sensor that is used to detect a freeze-up and cycle the compressor to prevent the condition. I don't know exactly how the Jeep system works but the situation is a failure mode common in A/C systems.


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Old 08-02-2014, 05:07 AM
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Re: HVAC (AC) after hard acceleration

I thought freeze up was an indication of low refrigerant


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  #22  
Old 08-02-2014, 05:47 AM
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Re: HVAC (AC) after hard acceleration

The only thing freezing up could be the AC evaporator, not compressor. Not familiar with the WK HVAC, but normally all air will go through the evaporator, independent of AC on or off. If the evaporator freezes, it could shut off all the airflow. There should be indeed some kind of sensor to detect this freezing up. They normally use a temperature sensor on the evaporator fins for this. The dealer should be able to test this at least.
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  #23  
Old 08-02-2014, 06:41 AM
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Re: HVAC (AC) after hard acceleration

Yes, evaporator, it was very late at night and I typed the wrong component. I meant evaporator which is the heat exchanger that the interior fan blows the air through to cool it. It has lots of closely spaced fins to support the heat exchange function to cool the inside air. Cooling the air creates moisture which is what you normally see drip from under the car. If there is a problem with the system that causes the moisture to freeze, it clogs the evaporator cutting off the air flow. If you turn the system off and the compressor is not running, the ice starts to melt and the airflow comes back. Hope this helps. You need to get the problem diagnosed by a service technician.


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