AC Appreciation

[ShadowsPapa]

I've read the TSB still allows that warm air blast but its for a much shorter time. Cannot confirm that though as mine doesn't do it ever.

Not sure where you read that - sure didn't on my 2020 after the TSB, and I've never noticed any such thing on my 2022.

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[jav_eee]

Not sure where you read that - sure didn't on my 2020 after the TSB, and I've never noticed any such thing on my 2022.

I’m sure it was in one of the forums.

 

[ShadowsPapa]

I’m sure it was in one of the forums.

Hmmm. Mine was fine after the update, but it did operate differently as far as dash outlets. IF the sun hit the sensors it would put cooler air out the dash, didn't care for that but it was more of an annoyance than anything and moving the vents resolved that - just turned them so they didn't aim right at me. I suspect it was trying to compensate for solar energy warming things up. Weird since it was fall and early spring and the warmth would have been welcome. I've not noticed my 22 doing anything like the 20 did. Maybe there was another later update they simply slid into the 22s and moved forward.

Evaporators can freeze up - AMC used to have a "desert only" setting that locked the AC on high, took the thermostat out of the equation. In Iowa, you could freeze that thing into a block of ice with the humid air.
Even today on these Jeeps, I have to ask how they heck are they doing it - how are they preventing evap freeze-up if not sending a bit of warm air through now and then or thermostatically shutting down the evaporator and letting it melt off. Maybe they never let that coil get that cold? That's almost got to be it - never let the evaporator get below about 33 degrees??

 

[BearDog]

I am mostly happy with the AC in the JT, except for when on the trails or in certain conditions when it doesn't seem to keep up or properly regulate temps.

Day to day though, I can't complain. It is a lot better than my VW was, but still the best cold AC I have experienced is in GM 2500/3500s with the duramax.

I'm happy with the JT a/c....

But you are 1000% correct. Don't know why, but nothing beats a GM truck a/c. Best in the world by far.

 

[AmosMoses]

I think the seating position in close proximity to the dash design of jk, jl and jt's, lends itself to very efficient heating and cooling of the driver and passenger. My jk's were also excellent and my jt is no different.

I loved my jk's interior design with the 2012 and the jl/jt's built on that in my opinion. Excellent design that is unmatched in any 4x4 vehicle. I hope they keep this theme in years to come.

 

[GrubbyBaja]

… was to unplug the blend door. …

So does that keep the air on recirculating all of the time (same as pushing the recirc button)?

 

[jav_eee]

So does that keep the air on recirculating all of the time (same as pushing the recirc button)?

Yes. If you hit the vent button it doesn’t change. That doesn’t work very good for people in other climates but down where I live we’ve been hitting “feels like” temps of 110+ for weeks now. I don’t want this thing to go to vent EVER. Haha

 

[Wageslave]

Hmmm. Mine was fine after the update, but it did operate differently as far as dash outlets. IF the sun hit the sensors it would put cooler air out the dash, didn't care for that but it was more of an annoyance than anything and moving the vents resolved that - just turned them so they didn't aim right at me. I suspect it was trying to compensate for solar energy warming things up. Weird since it was fall and early spring and the warmth would have been welcome. I've not noticed my 22 doing anything like the 20 did. Maybe there was another later update they simply slid into the 22s and moved forward.

Evaporators can freeze up - AMC used to have a "desert only" setting that locked the AC on high, took the thermostat out of the equation. In Iowa, you could freeze that thing into a block of ice with the humid air.
Even today on these Jeeps, I have to ask how they heck are they doing it - how are they preventing evap freeze-up if not sending a bit of warm air through now and then or thermostatically shutting down the evaporator and letting it melt off. Maybe they never let that coil get that cold? That's almost got to be it - never let the evaporator get below about 33 degrees??

Variable TXV's that respond to demand work a whole lot better than the fixed orifice systems that older cars had. Much easier to keep right above freezing without having to go through freeze thaw cycles like systems that solely regulate on pressure.

 

[Timoleon]

I like the AC in my Gladiator. I have the OEM headliners in it as well. That and the fact the vehicle is all white, helps keep it cool. And Thank god for remote start. I turn it on as I head for the door when out and about. I have thought about ceramic tint as well, but haven't found a need for it on the Gladiator. I did ceramic tint the wife's Wrangler (snazzleberry colored, and it gets hot to the touch in the sun) and installed Hotheads head liner kit for her vehicle. That baby is cool when we get in it. I keep both inside the garage at home so it starts out cool before any trips out into this heat (104 today [July 13, 2023] and up to 108 by Sunday).

I don't miss living in my old stomping grounds in California (about 60 miles dead west of Death Valley). It gets up into the low 120's in the summer.

 

[ShadowsPapa]

Variable TXV's that respond to demand work a whole lot better than the fixed orifice systems that older cars had. Much easier to keep right above freezing without having to go through freeze thaw cycles like systems that solely regulate on pressure.

Totally forgot about that aspect. Thanks. I had the fixed orifice systems stuck in my head working with my 82.

 

[Old Young Man]

You likely missed the talk abut the TSB 2 years ago that addresses this.
Yes, it only happened when on a lengthy road trip. I never experienced it with my 2020 until we took it to Colorado Springs and back. It was hot and on the way back after several hours of driving, I noticed it did it - I was in the passenger seat while my wife was driving so I can't say if it ever happened on any other trips, she never said.

Shame there is not a way as an owner to subscribe to TSBs. Or at least a place to seek them out. A lazy dealer likely doesn’t look for them until after numerous attempts to make a repair.

 

[ShadowsPapa]

Shame there is not a way as an owner to subscribe to TSBs. Or at least a place to seek them out. A lazy dealer likely doesn’t look for them until after numerous attempts to make a repair.

Yeah, it's like any other business - chains, for example, you eat at a chain or franchise restaurant and the food is excellent, the service beyond great, staff polite and so on. So you think hey, this place is great. You do a day trip to another part of the state and stop at another location and find the cooks ruin the food, the staff are all in a crappy mood and the service is slow.

When I took my JT in last - November, I think - for the misfire, the service writer said "the tech searched all of the TSBs, did a search of STAR information and finally found a document that fit your symptoms perfectly". The guy spent time - at that time it was a problem not yet totally solved with a TSB but they were seeking vehicles with the same symptoms and asking the dealerships to gather information and try their fix.
It worked on mine.
A month or so later they said a TSM came out for my exact symptoms and they said the TSB said to do what they had done. They checked, though, to be sure it actually took and it was fine.
That, IMO, was good service. You don't know what it is - so you dig and dig and at least TRY to see if there's any record anywhere of something similar.
It didn't hurt that while I was waiting in line, I sat long enough waiting so that when I started ot again, it misfired and set the MIL! There it was, in line to check in and just did it while pulling into their shop.
I told them keep it, drive it, take it to lunch, I'd sign anything necessary, but I would bet they could force the issue to happen. and they actually did just that.

 

[Old Young Man]

You would think when you go to a dealer a good computer system would automatically refer a problem or trouble code to the appropriate TSB but I guess it isn’t that simple. They could also require TSBs to be public info, as part of the right to repair, but the makers lobbyist and their money would really fight that.

 

[ShadowsPapa]

You would think when you go to a dealer a good computer system would automatically refer a problem or trouble code to the appropriate TSB but I guess it isn’t that simple.

It can't be that simple because things like a misfire can be caused by dozens of things, if not more, from PCM to valve train to injector to fuel pressure to any part of the ignition system to cam/crank position learning to a sensor (including O2) to an oil leak causing reduced resistance across an O2 sensor and the list goes on.
Type in "it misfires" and you might get 150 different bulletins.

P0300 - multiple cylinder misfires.
P0301 - cylinder 1 misfire
and so on -
I had so many "tips and hints" from the helpful internet over the months mine gave really weird misfires - and not a single one of them was even close. It was really an obscure thing. And why it impacted only one bank and on that bank, always one cylinder more than the others? Strange.

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