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  #133  
Old 02-24-2014, 07:27 AM
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Re: Problem With 2014 Grand Cherokee Heater

You know, other people have been testing their vent output at 60 F and have been getting 130 F output. What happens when you crank it all the way up to 70+ F?

Haha...


I feel like I am getting trolled by my HVAC. "Why are my fingers burning?!"

This happened after my vehicle was up to full, normal operating temperature and was shut down for approximately five minutes, then restarted.

"Toasty warm."
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  #134  
Old 02-24-2014, 08:42 AM
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Re: Problem With 2014 Grand Cherokee Heater

Question to all those having this issue.

have you had the HVAC update for the remote start auto issue?

Since I had this done, this issue has been much less of a problem. it would start to get hot in the cabin and then stop and cool off. It SEEMS better (still not perfect like my 2011)
will keep an eye on it.
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  #135  
Old 02-24-2014, 10:27 AM
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Re: Problem With 2014 Grand Cherokee Heater

My build date was several months after that TSB.
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  #136  
Old 02-24-2014, 12:55 PM
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Quote:
Originally Posted by Roadkill View Post
You know, other people have been testing their vent output at 60 F and have been getting 130 F output. What happens when you crank it all the way up to 70+ F? Haha... I feel like I am getting trolled by my HVAC. "Why are my fingers burning?!" This happened after my vehicle was up to full, normal operating temperature and was shut down for approximately five minutes, then restarted. "Toasty warm."
Set to 70 this morning. Air coming from vent was 140. Showed the service tech the short video. He was in agreement that it was a bit on the high side. I believe we will have a STAR case opened. If so I will post the number. I keep hearing that the idea is to get the Jeep up to the average selected temperature as quickly as possible then back off the temp coming out of the vent. That's all fine and dandy but who wants to roast in a sauna while it does that? Not me!!
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  #137  
Old 02-24-2014, 01:06 PM
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I keep hearing that the idea is to get the Jeep up to the average selected temperature as quickly as possible then back off the temp coming out of the vent. That's all fine and dandy but who wants to roast in a sauna while it does that? Not me!!
Yeah, that's a great idea in theory. In practice it sucks, especially when the feature removes all ability for manual control. Screw the "house thermostat" model... just give me the ability to control the temperature of the air from the vents and I will be happy.

...aaaannnnnddd they will never give us that feature. Haha, dammit.
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  #138  
Old 02-24-2014, 04:04 PM
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STAR told them to replace the internal thermostat. Well we shall see!
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  #139  
Old 02-25-2014, 05:56 AM
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[QUOTE="bryans;959241"]Had same problem, took it to Dealer and Here is what my slip said. "Checked for updates, none found, reflash with same calibration, perform hvac door calibration procedure three times, passed all three times, test controls and bus and feed back circuits, all were within normal limits, verify power grounds and feeds, all appear normal at this time, also perform witech updates on pcm, ascm and tcm. Check for temperature variation, run heater performance tests, 12 degrees is allowable, run sensor tests, replaced the sun sensor. This helped but still not right. By the way Quick Jeep solved my front steering wheel shimmy also. My jeep doesn't have one ounce of vibration up to 90MPH, and I have the 20" goodyear Fortera tires. Three other dealers told me it was normal for the front steering wheel to shimmy, caused by the electric assisted steering and there was no cure. Now I travel 1 1/2 hour (out os state) for good service.
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Old 02-25-2014, 07:09 AM
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12 degrees may be allowable per Jeep spec, but 70 degree swings from the vent (e.g. outputting 140 F air for a system setting of 70 F or outputting 130 F for a set value of 60 F) are unconscionable.

I'm sure they could bring the cabin temperature up to the thermostat setting even faster if they had the system fire up a blowtorch that were positioned above the dash, but that doesn't make the approach reasonable. Nor is blowing 125 F air when the setting is 60 F.

My guess is that this issue is caused by some faulty sensors/controllers coupled with a system design that was "too clever". As others have pointed out, every other vehicle model but this one has a manual mode. The engineers for this system "helped" us by making sure their very clever thermostat system is always in overall control, leaving us unable to override the schizophrenic system output.
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Old 02-25-2014, 08:25 PM
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Re: Problem With 2014 Grand Cherokee Heater

Ok, got mine back today with the new sensor, no change! They called Chrysler and they said to test others on the lot. The service tech used my thermometer and sure enough, they all worked the same way. They have it noted, but since they were all working the same way there was nothing else done. No STAR case opened as they said there was nothing at this time since they were all working the same. He test several on the lot. Back to the drawing board.
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  #142  
Old 02-25-2014, 08:54 PM
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Originally Posted by MajorTom View Post
Ok, got mine back today with the new sensor, no change! They called Chrysler and they said to test others on the lot. The service tech used my thermometer and sure enough, they all worked the same way. They have it noted, but since they were all working the same way there was nothing else done. No STAR case opened as they said there was nothing at this time since they were all working the same. He test several on the lot. Back to the drawing board.
So in other words, since every one of them doesn't work properly they all work properly according to Chrysler? Goody.
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  #143  
Old 02-25-2014, 08:55 PM
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Re: Problem With 2014 Grand Cherokee Heater

Quote:
Originally Posted by MajorTom View Post
Ok, got mine back today with the new sensor, no change! They called Chrysler and they said to test others on the lot. The service tech used my thermometer and sure enough, they all worked the same way. They have it noted, but since they were all working the same way there was nothing else done. No STAR case opened as they said there was nothing at this time since they were all working the same. He test several on the lot. Back to the drawing board.
I know the feeling. It looks like another forum member posted a success story back in December. I wonder if anyone with this issue has been able to try it. Of course it would require the dealership to cooperate.

Quote:
Ok folks, there is hope. Most of the issues with the GC are software related. I know it isn't an excuse in today's automotive world. I took mine in today for the heat issue and had it resolved. The service tech did file a STAR case. They had him reset the body controller back to factory default, flash with the latest firmware for the HVAC, then disconnect the battery for 20 min. It was within one degree after that. If you set it for 72 degrees, you get 71. That is close enough to me.
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  #144  
Old 02-25-2014, 09:09 PM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by loveracing1988 View Post
So in other words, since every one of them doesn't work properly they all work properly according to Chrysler? Goody.
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.
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