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  #145  
Old 02-25-2014, 09:18 PM
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Quote:
Originally Posted by recoil1911 View Post
It's a systemic anomaly. A case of "We probably didn't engineer it that way but if most of them exhibit it, it must be normal."
Chrysler enhanced customer care once told me the dealerships are their (Chrysler's) technical troubleshooting arm. I kind of thought that meant the dealership provides information into the conditions and possible root cause and the brains in Auburn Hills ran it through their supercomputer for analysis and next steps. I think mostly the end decision is left up to the dealership to make the call.
You would think of all of the engineers and higher ups driving them one of them would of had a problem and told someone about it to have engineering look into it.
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  #146  
Old 02-25-2014, 09:27 PM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by loveracing1988 View Post
You would think of all of the engineers and higher ups driving them one of them would of had a problem and told someone about it to have engineering look into it.
If they had the inside scoop on the vehicle maybe they just have steered clear of owning one.
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  #147  
Old 02-25-2014, 09:58 PM
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Originally Posted by recoil1911 View Post
If they had the inside scoop on the vehicle maybe they just have steered clear of owning one.
Valid point!
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  #148  
Old 02-25-2014, 10:02 PM
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So, can we replicate the software approach? Also, presuming our vehicles are up to date on the various modules' firmware, does this devolve to simply disconnecting the battery for 20 minutes?
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  #149  
Old 02-26-2014, 12:02 AM
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I don't think they are all like this. My 2014 (April build) limited works just as I would expect in both "auto" and "Manual" mode. Even when the wife has her side at 80 and I have mine at 65. It's not as good as when I had the manual sliders to adjust the temp but I'm fine with how it works. FWIW I don't usually leave it on auto b/c I like to control the fan speed.
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  #150  
Old 02-26-2014, 09:58 AM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by Megahiker2000 View Post
I don't think they are all like this. My 2014 (April build) limited works just as I would expect in both "auto" and "Manual" mode. Even when the wife has her side at 80 and I have mine at 65. It's not as good as when I had the manual sliders to adjust the temp but I'm fine with how it works. FWIW I don't usually leave it on auto b/c I like to control the fan speed.
I agree - I have a June build with the HVAC update applied - if I set it to auto and 70 degrees the car warms up, maybe over shoots a couple of degrees to start and then just holds steady - and the temps coming out my vents are nothing near what is happening to the folks here.
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  #151  
Old 02-26-2014, 11:56 AM
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Re: Problem With 2014 Grand Cherokee Heater

Sometimes mine is fine once in awhile for a bit my car is very hot, then it seems normal. I have not done a test with a thermometer since it only happens every so often.
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  #152  
Old 02-26-2014, 12:21 PM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by TurboRush View Post
I agree - I have a June build with the HVAC update applied - if I set it to auto and 70 degrees the car warms up, maybe over shoots a couple of degrees to start and then just holds steady - and the temps coming out my vents are nothing near what is happening to the folks here.
That's about what mine does. I think it over shoots more on Auto. And I like controlling the fan so I keep it on manual. By setting the fan low it comes up fairly smooth with very little overshoot and it's extremely quiet on Fan = 2 or less. And it doesn't heat things up much faster with higher fan rates and will over shoot more at high fan rates.

I'd be curious what the temp is, inside the vent on systems people feel work. I think the folks with issues may have real issues but I think the temp inside the vent being high might be a red herring and can be normally high in some situations without over heating the cabin. I don't know that for sure of course.
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  #153  
Old 02-26-2014, 01:27 PM
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Re: Problem With 2014 Grand Cherokee Heater

I tried playing with it last night. I left it in manual, and it went to defrost with fan almost maxed and pretty warm temperatures reaching me. I then switched to manual mode and no matter what temperature i used, was getting the same temp air coming out of the vents. For fun i then threw it into AC mode, and set it for 60. Still getting hot air out of the vents. The last experiment i did was to keep going down until it says LO for a setting. Then really cold air started coming out. Looks like going to LO bypasses any sensors.

Looks like the system is too smart for its own good. Seems there is a lot of dependance on the outside air temp when the computer is deciding what to do. Maybe there is limited temprature variability, just relies on the fan to change the intensity??

Im curious when the outside air temp. goes higher than the setting how the computer will react.
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  #154  
Old 02-26-2014, 03:05 PM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by mswlogo View Post
I think the temp inside the vent being high might be a red herring and can be normally high in some situations without over heating the cabin.
The major issue is that 120+ F is painfully hot. If this is normal then normal is wrong. You can see in jeepwes' video that his thermometer probe is *outside* the vent and still reading close to 130 F.

Like you, I prefer to set the fan to blow manually. However, the schizophrenic output temperature happens on auto as well. The system seems to blow exceedingly hot or "cold" ("cold" may actually be the set thermostat value). Regardless of whether the cabin average temperature is "correct" or "within tolerance", the output temperature from the vents matters in terms of tolerability.

More simply, the average cabin temperature is far less important to perceived tolerability than the temperature from the vents. If the system were blowing a stable temperature then the desired temperature level could be achieved even if the system were miscalibrated. As it stands, there is no way to control the system's output (except by turning it off altogether).
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  #155  
Old 02-26-2014, 03:24 PM
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Re: Problem With 2014 Grand Cherokee Heater

ok, the heat issue is back.. seems like when its mid 30's to mid 40's out.. the auto works great!, below 20.. nope.. hot as hell again.

and now... my rear defrost isnt coming on with remote start???
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  #156  
Old 02-26-2014, 08:39 PM
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Re: Problem With 2014 Grand Cherokee Heater

My rear defroster never comes on with Remote Start.
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