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  #193  
Old 03-06-2014, 12:55 PM
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Re: Problem With 2014 Grand Cherokee Heater

Yesterday, I had my heat set to 85 and as I drove home I went to manually turn the temp down about 3 degrees - and as soon as I did it started blowing out cold air. WTF

I know I've read others had that problem, so I thought I'd stick it in this much larger thread about the heater issues.

Has there been a resolution (or definitive cause) or is it another tell the dealer and get blown off thing.
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  #194  
Old 03-06-2014, 01:23 PM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by wraab View Post
Yesterday, I had my heat set to 85 and as I drove home I went to manually turn the temp down about 3 degrees - and as soon as I did it started blowing out cold air. WTF
Okay, I am presuming you already know that there is no way to control the air temperature coming from the vents. The "clever" HVAC system will always try to make the *cabin* temperature equal to your thermostat setting. If that means blasting you with cold air when you tick the thermostat down by 3 F, well, didn't you know that's the very definition of comfort? This is an exclusive Jeep feature.

Go ahead and call the dealer. It will be very helpful if they take you seriously and don't just tell you that this is normal. One fortunate guy actually had a dealer who sent techs riding with him and they captured sensor data that coincided with the insanity. He had an internal cabin temp sensor replaced and now his system is only "sub-par"!

You can also try documenting the insanity with a video/photograph of a meat thermometer next time it happens. That is harder for dealers/Jeep to ignore.
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  #195  
Old 03-06-2014, 01:31 PM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by Roadkill View Post
Okay, I am presuming you already know that there is no way to control the air temperature coming from the vents. The "clever" HVAC system will always try to make the *cabin* temperature equal to your thermostat setting. If that means blasting you with cold air when you tick the thermostat down by 3 F, well, didn't you know that's the very definition of comfort? This is an exclusive Jeep feature.

Go ahead and call the dealer. It will be very helpful if they take you seriously and don't just tell you that this is normal. One fortunate guy actually had a dealer who sent techs riding with him and they captured sensor data that coincided with the insanity. He had an internal cabin temp sensor replaced and now his system is only "sub-par"!

You can also try documenting the insanity with a meat thermometer next time it happens. That is harder for dealers/Jeep to ignore.

yeah I figured as much.

I guess I'll just deal with the super duper smart HVAC unit as is.
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  #196  
Old 03-06-2014, 04:37 PM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by Roadkill View Post
Yes, that is the brain damage of this ironic & speciously clever HVAC system. You are sitting there in a warmed up vehicle and think, "Wow, I'm a little cold. I would like the air blowing on me to be slightly warmer." so you increase the thermostat by 1 F. The air coming from the vents inches from your body immediately increases by 60+ F to 120+ F. "Thank you, Jeep, that is exactly what I was hoping would happen," said no one ever. Seriously, this is the kind of thermostat I imagine they give people in hell: "Go ahead, make yourself comfortable... <evil laugh>"
It WON'T do that !! And neither will my Home HVAC.

If I lower it 1 degree it doesn't lower the air temp in the ductwork. It SHUTS OFF.

And if I raise it 1 degree it will Turn on and put out around 120 degree air (or what ever, I have not measured it).

And if I lowered it 5 degrees and had my house on Auto (which I don't) it would turn on the AC and blow 60 Degree air.

I can understand why you might not like it that way. But they are not gonna change it.

I think if you set the Fan Low the switch between Heating and Not Heating won't feel so extreme.
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  #197  
Old 03-06-2014, 04:39 PM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by wraab View Post
Yesterday, I had my heat set to 85 and as I drove home I went to manually turn the temp down about 3 degrees - and as soon as I did it started blowing out cold air. WTF

I know I've read others had that problem, so I thought I'd stick it in this much larger thread about the heater issues.

Has there been a resolution (or definitive cause) or is it another tell the dealer and get blown off thing.
The fact you had it on 85 is an indication that you are not using it correctly.

You will overshoot and then to correct for that it WILL turn on cold air.

Granted maybe you have to have it on 85 because your is broken.

I NEVER put mine on above 72 or below 68.

As long as it's calling for heat, putting it on 85 won't make it blow hotter air or heat up any quicker.
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  #198  
Old 03-06-2014, 04:41 PM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by mswlogo View Post
The fact you had it on 85 is an indication that you are not using it correctly.

You will overshoot and then to correct for that it WILL turn on cold air.

Granted maybe you have to have it on 85 because your is broken.

I NEVER put mine on above 72 or below 68.

Uh, yeah. No. I can use the unit correctly. They've provided piss poor engineering it seems.

It works just fine in my Infiniti when I raise or lower the temp. But thanks for playing.
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  #199  
Old 03-06-2014, 04:50 PM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by mswlogo View Post
It WON'T do that !! And neither will my Home HVAC.
Your home HVAC may not do this (because it is sane), but perhaps you haven't used the Jeep's HVAC in "manual mode". I assure you that it does do this on affected vehicles.

You seem to be operating under the presumption that the Jeep HVAC system is behaving appropriately. If your vehicle's HVAC does not operate this way in "manual mode", then perhaps yours operates differently than ours. If that is the case, perhaps you might not attempt to contradict our own observations.

Oh, if you were wondering, yours is the kind of dismissive response that led to the pictures/videos of thermometers.

If you haven't already seen it, watch jeepwes' video: 2014 Jeep Grand Cherokee HVAC Issues. See that vent temperature incessantly cycling between ~60 F and 120+ F while it is just sitting there? Are you going to argue that this is normal? I am not going to back their engineers on this: it's either a defect or it's bad engineering.
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  #200  
Old 03-06-2014, 08:31 PM
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Re: Problem With 2014 Grand Cherokee Heater

I have same issue. I find that if I leave it at 65 - it will heat up to probably 75 or 80 -- then going down to 62 shuts off the stupid system. Then - when you enter the car at 62 - the AC kicks off cold air. Repeat cycle...

Amazing.
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  #201  
Old 03-07-2014, 08:25 AM
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Re: Problem With 2014 Grand Cherokee Heater

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Originally Posted by mswlogo View Post
It WON'T do that !! And neither will my Home HVAC.

If I lower it 1 degree it doesn't lower the air temp in the ductwork. It SHUTS OFF.

And if I raise it 1 degree it will Turn on and put out around 120 degree air (or what ever, I have not measured it).

And if I lowered it 5 degrees and had my house on Auto (which I don't) it would turn on the AC and blow 60 Degree air.

I can understand why you might not like it that way. But they are not gonna change it.

I think if you set the Fan Low the switch between Heating and Not Heating won't feel so extreme.
your home hvac is not the same.. and it doesnt matter. Set your house at 75, when it gets to 76 or 77 in the house, the HVAC turns off.. in the jeep, it sometimes gets 15 or 20 degrees hotter than what its set at. Sure the vent air can get hot, but thats not normal.

Plain and simple, my 2011 had ZERO ISSUES with this... turn the temp up a few.. and the fan speed went up a little and the air temp from the vent got a bit warmer. When it hit X degrees, the fans lowered and it kept it there. the 2014 is like a wind tunnel blasting hot air until its WAY to hot then SOMETIMES its slows down. Even when it does, its never calm and quiet like the old system... its always loud enough that i hear it. Its a joke....

newest issue (beside the no rear defrost on remote start! wtf!) is its never really warm in the truck now.. it used to be toasty.. now its sorta warm even after its been running for 10 minutes. Then you get in, the fans drop down to almost nothing.. then speed back up and roast you like a convection oven.
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  #202  
Old 03-07-2014, 10:12 AM
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Re: Problem With 2014 Grand Cherokee Heater

I have a diesel GC and I have never noticed a problem with the heat. I have it set at 70 and sometimes a bit higher since it has been really cold this winter. I do not idle to warm it up either. Fan is on very low or off when I start off and then when the oil temp hits around 105 the fan kicks in at a higher than normal speed which slows down as the cabin warms up.

When it is really cold out the inside never gets to a consistent inside temp as below zero my feet sometimes feel a little cold during my 1 hour commute.

I have not ever measured the inside temp but more or less just leave it alone. On warmer days I turn it down to maybe 68. I leave it on Auto. I do not feel outrageously warm air blowing on me and probably will never check the temp inside vs the setting as if I am cold I move it up and down when it seems too warm. I do not sense that the inside temp varies much when it stays at one setting.

An earlier post said that it is annoying that 68 degrees should mean 68 degrees and then said something about satellite radio not going to the right channel. I guess that would be an issue but with the satellite radio the channels I use are linked to a preset button and I could care less what channel they are. I set the temp based upon what temp feels comfortable to me.

I mean comfortable temp is relative anyway. In NE when your house air is really dry the temp could be 70 and you freeze you butt off. 70 degrees in the humid summer feels warm. In the truck when it is below zero warmer seems to work better because you can imagine the amount of heat being sucked off as I go down the highway.

I never bought into the temp controls for one side or the other so I just keep them synced up. It does bother me a bit that I have to turn on my rear defroster to defrost the mirrors. Now the mirror defroster is something I could get upset about as it sucks in cold temps. In the Jetta you turn it on and a few minutes latter any ice, snow of dew that was against the mirror is gone. I drove 10 minutes with it on and while it started to defrost the mirror I was starting to think they were not working.
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  #203  
Old 03-07-2014, 04:42 PM
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Quote:
Originally Posted by StaticFX View Post
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.
.



What is the problem with the HVAC remote start ???
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Old 03-07-2014, 04:44 PM
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What is the problem with the HVAC remote start ???
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