heater not maintaining temp (my story so far) - Page 2 - 2014+ Jeep Cherokee Forums
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post #11 of 71 (permalink) Old 02-09-2016, 10:24 PM
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Interesting, thanks for posting the issues and probable resolution.

My heat does fine, but it does seem that when it reaches temp, it then goes to full cold. This does not bother me except when on long drives, as it stays cold for a pretty long time before reacting and warming up. It bothers my wife instantly...."can you turn the heat back on, my feet are cold"

Watching as well....
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post #12 of 71 (permalink) Old 02-10-2016, 08:00 AM
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It seems like I am having this issue but I want to do more testing. Does anyone know if the cabin thermistor/temp probe located in the HVAC control head or else where on the dash?

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post #13 of 71 (permalink) Old 02-10-2016, 02:30 PM Thread Starter
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Quote:
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It seems like I am having this issue but I want to do more testing. Does anyone know if the cabin thermistor/temp probe located in the HVAC control head or else where on the dash?


i am curious about this myself, yet i keep forgetting to ask the folks at the dealer. i'll try to remember to ask today, thanks for the reminder.

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post #14 of 71 (permalink) Old 02-10-2016, 02:32 PM Thread Starter
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quick update: got a call from the dealership saying the AC Control Head (originally on backorder) is in, and they can install it tomorrow. dropping the jeep off this afternoon, will update tomorrow and after some test drives. (apparently it's going to be a cold week in GA, so i should have ample opportunity to test it out. )

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post #15 of 71 (permalink) Old 02-10-2016, 02:49 PM
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Well, I hope everything gets resolved, and I'll try to remember this if anything odd happens on mine, knock on wood. I've had heating issues before, and I don't care to repeat the experience.

About 8 years back I was driving a used Buick LeSabre as a temporary vehicle after wife's Grand Am decided to throw a timing belt and mostly destroyed its engine, in the dead of winter. We were saving up at the time for a move to Eau Claire to cut down on my 100 mile daily commute, and had to wait a month to have enough scrapped together for the rental downpayments + a new (used) vehicle. One of it's quirks in my short usage of it was the blower motor for the heater core would only engage (temporarily) after hitting it repeatedly with a large screwdriver, which the owner helpfully provided. It would work for about 20 minutes, at which point I would either have to begin freezing, or pull over and repeat the process.

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post #16 of 71 (permalink) Old 02-10-2016, 02:55 PM
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Quote:
Originally Posted by Colin View Post
One of it's quirks in my short usage of it was the blower motor for the heater core would only engage (temporarily) after hitting it repeatedly with a large screwdriver, which the owner helpfully provided. It would work for about 20 minutes, at which point I would either have to begin freezing, or pull over and repeat the process.
Ha! reminds of a 69 Pontiac I had for awhile...it had a starter that would bind when it was cold. Only way to get it to turn over was to whack it with a hammer, preferably while someone cranked it. Hard to do when you are alone...but there were plenty of winter nights I would be lying under that car banging on the starter to get it going...
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post #17 of 71 (permalink) Old 02-12-2016, 08:58 AM Thread Starter
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got the jeep back yesterday, new AC Head Control was installed. short story: it seems better, but i want to give it a week of commutes just to make sure.


more detailed version:
remote started car, ~40 degrees outside. AC was previously set to 65. (it was warm yesterday.)
got in car, cranked AC to 73, put fan on 3 or 4.
warmed up nicely, just like before.
after cabin was nice and toasty (15min or so?), i turned the AC down to 72 and fan down to 1.
after ~25 miles, the AC started pumping not-as-warm air (as expected to maintain a temp as opposed to getting to that temp).
the not-as-warm air did not seem nearly as cool/cold as what the AC pumped prior to the fix.


so yep. once the AC goes into regulate-the-temp mode, it does seem to switch to a different, cooler mix of air than what it pumps trying to hit your set temp. and that mix does seem warmer than before. part of the problem was also that once it was in regulate mode, cranking the temp & fan back up (sometimes to ridiculous settings) would not result in warm/hot air again, and the AC would continue to pump out cool/cold air (making the cabin colder and colder). i have not had a chance to test that at all yet. i'll do my best to test over the next week or so and report back, but as of right now, i'm pretty hopeful that the problem has been fixed by replacing the AC Head Control.


(sorry if that was too verbose; wanted to be as detailed as possible.)




also, props to Mark S., service advisor at my local dealership; and Micheal, my star case rep (through 1800-iam-jeep). both were knowledgeable and professional throughout.
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post #18 of 71 (permalink) Old 02-12-2016, 10:39 PM
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/\ My wife would love a modulated 'cooler' airflow instead of the cold air when it reaches temp.

Still watching, thanks for the update

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post #19 of 71 (permalink) Old 02-14-2016, 07:55 PM
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Had the HVAC controls replaced with the radio and it did not help. Once the correct temperature is reached cold air starts blowing through the defroster when the car is in auto mode.
Still have no answer or reasoning from dealer why this happens.
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post #20 of 71 (permalink) Old 02-15-2016, 06:29 PM
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If enough people take their Cherokee in for this obvious problem, maybe FCA will take action. Hoping. Auto mode is completely useless when it gets cold out.

(I can understand running the A/C when it's cold out to dry out the air in the cabin. Problem is the system is not mixing in hot air to bring the mixed air temp to what the driver requested.)
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