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  #1  
Old 08-11-2016, 05:23 PM
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AC Auto mode runs HIGH all the time

My 2016 Summit's climate control AUTO mode fails to gradually lower the blower fan's speed over time, even after the cabin temperature has reached a selected comfortable temperature, say, 72 . Instead, the blower continues full-blast, and after a little while I'm (a) feeling downright chilly; (b) I'm tired of cold air being blasted through the top vents, which are almost always aimed fully AWAY from my face and torso, and (c) the noise of the max blower speed is irritatingly noisy.

In other words, there is nothing "Auto" here. Unlike any other vehicle I have driven, in which the auto mode gradually throttles back the fan speed and settles down as the desired cabin temperature is reached, I instead have to manually/gradually dial back the blower fan speed. Something is clearly not right here. It appears that while in AC Auto mode, the microprocessor is not correctly measuring the cabin temperature, so it just blasts away. (No, I have never seen any ice crystals being spit out of the air vents.)

This summer in central Ohio, it commonly reaches 90 or more. I put in place a reflective windscreen behind the windshield when the vehicle is parked. When I first get into the vehicle on a hot day and start it up, I will often select Max AC temp setting, and LO appears on the touch screen. I also open the rear windows for a little while as I get underway. A few minutes later, I will push the "auto" button, and the set temperature display then reads my set 72, and the button for "Recirculate" shuts off. (So far, so good.)

However, as mentioned above, when in auto mode, the system continues to operate as if the cabin is hotter than hell, even though I am having goosebumps because it is so cold inside the cabin.

Finally, I will also mention (perhaps most significantly) that even when I get in the vehicle in the morning and the outside temperature is 68, the blower fan will run at Max speed even when set on Auto. It seems as if the vehicle not only does not know the cabin temperature, it is also not correctly registering the outside ambient temperature! So, there I am, driving away and it's 68 outside with the temperature set at 72 in the cabin, and when set to auto mode, the system is blasting me out of my seat with cold air!

WTF? Even when it is very cool outside, I have never seen the AC auto perform anything automatic whatsoever. Has anyone else experienced this in a 2016 Summit? I will be taking it to the dealership this weekend to discuss the problem further.

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  #2  
Old 08-11-2016, 07:15 PM
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Re: AC Auto mode runs HIGH all the time

No help here, but my '15 Limited frustrates me because no matter how blazing hot it is here, even when the Jeep sits in blazing sun all day, the only way to get it to go to Max Cold is to manually set it to Max Cold. My '05 would come on at full max and gradually ratchet down as the cabin cooled.

Very frustrating.

Jim
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Old 08-11-2016, 07:30 PM
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Re: AC Auto mode runs HIGH all the time

I think the auto AC has that problem when you're making major temp setting changes, like going from LO to 72. It's like it gets lost and can't figure itself out.

On my 16 HA I've noticed that if I have my temp set to 72 and turn it on auto it doesn't really seem to cool that well, although it's better than how my 14 cooled. If I do the same thing with it set to 68 then it seems to do a better job of cooling. In either case, the blower will start out high with a hot interior but gradually slows down as the interior cools.
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Old 08-11-2016, 07:46 PM
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Re: AC Auto mode runs HIGH all the time

My '14 Overland was the only vehicle I had in years that I ever had to touch the HVAC. I have been driving an Escape for almost two years waiting for Jeep to hopefully get all the bugs out. In October of '14 I set the temperature to 68 degrees. Although passengers will sometimes change their side, I haven't touched the drivers side. It switches to high when necessary and back to normal when appropriate. I've had GM and Acura vehicles that worked just as well. Hopefully the MY17 will work properly. The Grand Cherokee is a fantastic vehicle, but the little annoyances can get to you after a while.


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Old 08-12-2016, 01:26 PM
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Thumbs up Re: AC Auto mode runs HIGH all the time

The problem occurs even when I don't use the Max AC setting initially.

By the way, I am totally in love with the vehicle otherwise. It's the best vehicle I have ever owned.
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Old 08-12-2016, 01:52 PM
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Re: AC Auto mode runs HIGH all the time

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Originally Posted by Psydoc View Post
The problem occurs even when I don't use the Max AC setting initially.

By the way, I am totally in love with the vehicle otherwise. It's the best vehicle I have ever owned.
Will be curious to know what they have to do. Keep us posted.
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Old 08-18-2016, 09:55 AM
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Re: AC Auto mode runs HIGH all the time

I have never been happy with any 'auto HVAC' system I've ever had in a car. We've been doing it for decades in houses, but auto makers can't figure out how to keep a solid temp.


2004 WJ, 2007 335i, 2012 WRX, 2014 WK2: All of them sucked at auto HVAC. Either the fan is blowing way too hard all the time, or its blowing hot when it should be cold, or its blasting super hot/cold air instead of something in the middle.
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Old 08-18-2016, 08:42 PM
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Re: AC Auto mode runs HIGH all the time

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Originally Posted by dcorn View Post
I have never been happy with any 'auto HVAC' system I've ever had in a car. We've been doing it for decades in houses, but auto makers can't figure out how to keep a solid temp.


2004 WJ, 2007 335i, 2012 WRX, 2014 WK2: All of them sucked at auto HVAC. Either the fan is blowing way too hard all the time, or its blowing hot when it should be cold, or its blasting super hot/cold air instead of something in the middle.

The auto HVAC works perfectly in my 08 Accord. Jeep could take some pointers from them.
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Old 08-19-2016, 05:54 AM
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Re: AC Auto mode runs HIGH all the time

The best auto HVAC I've ever owned was in my '95 Intrepid.

I generally don't have to fiddle with the auto HVAC is either my '07 or '14 GCs.. but when my daughter borrows the '07 she is forever fiddling with it.

In the case of the fan always staying on high, I wonder if something has gone wrong with your sun sensor?
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Old 08-27-2016, 03:28 PM
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Re: AC Auto mode runs HIGH all the time

I am experiencing a similar issue on a 2014 grand Cherokee only the fan never goes high enough on auto. When it's really hot inside the highest the fan goes level 6. I have to manually turn the fan speed to 7 every time. is this normal?


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Old 08-27-2016, 03:39 PM
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Re: AC Auto mode runs HIGH all the time

I found the solution to my particular problem by going into settings and making some changes. I can't remember what I did though, sorry. And any rate, it now works perfectly.
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Old 08-27-2016, 03:59 PM
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Re: AC Auto mode runs HIGH all the time

Quote:
Originally Posted by jeep4x4r View Post
I am experiencing a similar issue on a 2014 grand Cherokee only the fan never goes high enough on auto. When it's really hot inside the highest the fan goes level 6. I have to manually turn the fan speed to 7 every time. is this normal?


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mine wont go to 7 either when on auto even if it has been sitting in a parking lot all day in the sun at 100 degrees. don't know why it is like that should take it to max
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