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[ShadowsPapa]

What your describing in your house is the same as the auto mode in our car. Most all modern homes are auto.

I ran this my my home HVAC guy who makes a living being a repair guy for Johnson controls. He sent me a good article that explains it well... he said the same concept for our Jeeps:

https://www.hunker.com/12591346/difference-between-automatic-air-conditioning-vs-manual

in manual mode the temp shouldn’t just change or cut off when the desired temp is obtained, that’s what happened in auto mode. In manual mode, would would need to manually cut it off if it gets too hot. All controls should perform as set in manual mode and should NOT vary. If you set to hi heat and fan speed of 7, it should stay on hi heat and fan speed of 7 until you MANUALLY cut it off.

btw, he got a pretty good laugh over this forum. He said we could maybe group Skype sometime to answer questions.

That's not how manual worked even in my Chevy! Once it got to my set temp, the air was moderated to keep it there. IT didn't operate like my Javelin where I had to move the lever over to keep from roasting. Manual in my CHEVY was also controlled by number I chose for temperature. Why would my Jeep be different than my Chevy was?
Manual still cut the air temperature back once it reached the setting. Fan still ran as fast but we didn't roast.

So you are saying you would not accept a Silverado HVAC. It tempers the air temperature once it reaches my 68 degrees. There was no lever to move. How would you control it if you didn't want it to do that? There's no slider or lever - there's nothing you move from C to H to make the air warmer or cooler. You chose the cabin temperature even in MANUAL mode - that's CHEVROLET I'm talking about.
Show me the slider that you move to make the air hotter or cooler in these or my Chevy truck.
Now show me in the pic below where you have a slider and where it would blow hot air until you told it not to - to me the controls look awfully like Jeep - + and - to set the temp which would be displayed on the screen. If the auto button is pushed and the light is on, it's in auto mode. Press it again and it's in manual mode. BOTH auto and manual in GM products go by the temp you set using the + and - buttons. In manual mode, auto light being off, once the temp inside reached what you set, the air ceased being HOT and cooled to match the cabin temp. That was in MANUAL mode - the mode my wife liked to use. Odd, because all she was changing was the FAN mode!

In short, the JT operates exactly like the Chevy system.

It appears you are saying the same thing because it does not blow hot air until you move anything. It used the temp you set - manual or auto mode.

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[danielspivey]

That's not how manual worked even in my Chevy! Once it got to my set temp, the air was moderated to keep it there. IT didn't operate like my Javelin where I had to move the lever over to keep from roasting. Manual in my CHEVY was also controlled by number I chose for temperature. Why would my Jeep be different than my Chevy was?
Manual still cut the air temperature back once it reached the setting. Fan still ran as fast but we didn't roast.

So you are saying you would not accept a Silverado HVAC. It tempers the air temperature once it reaches my 68 degrees. There was no lever to move. How would you control it if you didn't want it to do that? There's no slider or lever - there's nothing you move from C to H to make the air warmer or cooler. You chose the cabin temperature even in MANUAL mode - that's CHEVROLET I'm talking about.
Show me the slider that you move to make the air hotter or cooler in these or my Chevy truck.
Now show me in the pic below where you have a slider and where it would blow hot air until you told it not to - to me the controls look awfully like Jeep - + and - to set the temp which would be displayed on the screen. If the auto button is pushed and the light is on, it's in auto mode. Press it again and it's in manual mode. BOTH auto and manual in GM products go by the temp you set using the + and - buttons. In manual mode, auto light being off, once the temp inside reached what you set, the air ceased being HOT and cooled to match the cabin temp. That was in MANUAL mode - the mode my wife liked to use. Odd, because all she was changing was the FAN mode!

In short, the JT operates exactly like the Chevy system.

It appears you are saying the same thing because it does not blow hot air until you move anything. It used the temp you set - manual or auto mode.

Not sure, never had a Chevy. Explain to my why my Honda works the way it’s supposed to?

just called and talked to my service manager. He confirmed the temperature should not vary in manual mode, it should only vary in auto mode. He said in manual it should stay where it’s set.

 

[danielspivey]

Not sure, never had a Chevy. Explain to my why my Honda works the way it’s supposed to?

just called and talked to my service manager. He confirmed the temperature should not vary in manual mode, it should only vary in auto mode. He said in manual it should stay where it’s set.

I sent jeepcares a message so they can shed some light on the confusion of manual vs auto. It’ll be interesting to see what answer they come up with ! I’ll share when I get a response.

 

[ShadowsPapa]

Not sure, never had a Chevy. Explain to my why my Honda works the way it’s supposed to?

just called and talked to my service manager. He confirmed the temperature should not vary in manual mode, it should only vary in auto mode. He said in manual it should stay where it’s set.

Is that person talking CABIN temperature - if so, that's correct. The CABIN temp should not vary.
Did you mention the DIFFERENCE - air coming out the outlets VS cabin temperature?
Are we talking the same thing - ENTERING AIR - air coming into the cabin via the ducts - or cabin air temp?

It would seem that if the air coming out of the vents was only 72, what you set the temperature at - It will never reach 72 in an uninsulated Jeep unless it blows warmer air first - because of heat loss through the glass, the skin of the vehicle, and air infiltration.

May be wrong but it would seem that if all you do is blow 72 degree air into a Jeep - the cabin temp won't reach 72 degrees due to the constant heat loss. You have to put in as many BTUs as are being LOST through conduction, air infiltration and more.
It would also take forever to get there - start out with a cab that's 0 degrees and the best you do is blow 72 degree air in there, the losses will keep the temp in the cabin down for a very long time if it doesn't start out more hot.

My chevy kept the cabin temp at what I set it at - no matter the mode - if it blew cooler air the whole time, it would have never reached it. If it blew 68 degree air the whole time - I wonder if it would have ever reached 68 degrees in the truck.
The number you pick is cabin temperature - is that not correct????
It's not the temperature of the air coming out the vents - but it's gauging by the sensor by your knee - right?

To me the temp in the cabin is far more important than the air coming out of the vents.
I want the cabin to be that temp, if the air blowing out is warmer to get there, I'll adjust the vents away from me.
The temperature in my house is a lot more important than the temp of the air coming out the registers.

 

[ShadowsPapa]

I sent jeepcares a message so they can shed some light on the confusion of manual vs auto. It’ll be interesting to see what answer they come up with ! I’ll share when I get a response.

VERY interested - I REALLY wish I could get my hands on the HVAC troubleshooting info like I have for all of my other vehicles save for the 2018 Grand Cherokee. I know the GC bakes me until it gets up to temp. My wife likes the air coming out the dash and in the winter that HOT air coming out there dries the skin until it gets warmed up in the cabin and then the air cools off a bit.
Hey, she never ever ever uses automatic, so her GC must change air temp until her chosen CABIN temp is reached........... hmmmmmmmmm
She hates auto mode, doesn't want to give up the FAN speed control. So she cranks the fan up, set the temp to 68 or whatever her hormones decide that day and I burn until it reaches that temp.

 

[danielspivey]

VERY interested - I REALLY wish I could get my hands on the HVAC troubleshooting info like I have for all of my other vehicles save for the 2018 Grand Cherokee. I know the GC bakes me until it gets up to temp. My wife likes the air coming out the dash and in the winter that HOT air coming out there dries the skin until it gets warmed up in the cabin and then the air cools off a bit.
Hey, she never ever ever uses automatic, so her GC must change air temp until her chosen CABIN temp is reached........... hmmmmmmmmm
She hates auto mode, doesn't want to give up the FAN speed control. So she cranks the fan up, set the temp to 68 or whatever her hormones decide that day and I burn until it reaches that temp.

Let’s see what Jeep cares says. My guess is the uncertainty of the operation is due to the lack of details in the manual. They should have described manual mode better! If they did we wouldn’t be having this discussion right?

 

[futzin']

May be wrong but it would seem that if all you do is blow 72 degree air into a Jeep - the cabin temp won't reach 72 degrees due to the constant heat loss.

In MANUAL mode, I wouldn't expect it to. That's what AUTO mode is for, IMO.

Sometimes I want to manually choose the temp of air I'm getting, as well as the force of it.

 

[danielspivey]

In MANUAL mode, I wouldn't expect it to. That's what AUTO mode is for, IMO.

agree with futzin here.

 

[ShadowsPapa]

Let’s see what Jeep cares says. My guess is the uncertainty of the operation is due to the lack of details in the manual. They should have described manual mode better! If they did we wouldn’t be having this discussion right?

Yup - the manual is even a bit below sketchy in that area, IMO.
Maybe the BOOK is not fully accurate. It's happened before - note we're already on revision 3 of the owner manual as it is.

Frankly, I'm not so sure we are that far apart - part may be terminology, getting things across, whatever.
So don't take my discussion here wrong - and I'm always open to being shown wwwwwrrr.... uh, wrrr.... wrr... -you know the word - when someone reaches out with solid info.

 

[ShadowsPapa]

In MANUAL mode, I wouldn't expect it to. That's what AUTO mode is for, IMO.

Sometimes I want to manually choose the temp of air I'm getting, as well as the force of it.

Go to manual mode, crank the fan to where you want it, jack that temperature number up. Problem solved, eh?
Want the air cooler - do what I did, push the down temp button until I hit 65 and the temp of the air coming out the vents dropped a bit.
Just use the up and down arrows to set the air temp -want hot air coming out the vents- up-arrow it to 80 degrees. Air now too hot? down-arrow it to 65. Just like the old days with a sliding lever. But you push a button to do so.

 

[danielspivey]

Go to manual mode, crank the fan to where you want it, jack that temperature number up. Problem solved, eh?
Want the air cooler - do what I did, push the down temp button until I hit 65 and the temp of the air coming out the vents dropped a bit.
Just use the up and down arrows to set the air temp -want hot air coming out the vents- up-arrow it to 80 degrees. Air now too hot? down-arrow it to 65. Just like the old days with a sliding lever. But you push a button to do so.

that’s the issue w ours (those having issues) Set to hi heat then change temp to 62, it’s still max heat. 62 should be in no terms or perception warm, much less max heat or hot.

 

[ShadowsPapa]

that’s the issue w ours (those having issues) Set to hi heat then change temp to 62, it’s still max heat. 62 should be in no terms or perception warm, much less max heat or hot.

OK, so if I were to try to duplicate the issue - I'd go to manual mode, set the temp to something hotter than I would normally, say up to 78 or whatever. Let it get good and warmed up engine-wise and once the air was hotter than I could stand going in, bump it down to say 64 or 65 - I SHOULD be able to notice a change in the air temp because it should have been pushing out 78 degree air and now I've dropped it 13 or 14 degrees - and should FEEL that drop in the air coming out (assuming the cabin temp was warmed up to 64 degrees or more)
And if I crank the temp up in manual mode, 78 or 79 or whatever, let it get warmed up in there and then reduce it to 62, 63 or whatever, and I don't notice a change in the temp of the air blowing out the vents fairly soon, (allow a couple of seconds for it to respond and for the hot air already in the plenum and duct work to get blown out and the duct work to cool down a bit from that 78 degree air heating it up) there's a problem.

 

[uplandgunner]

I really don't know what everyone expects. I have had my JTR set at 67 degrees and I'm quite comfortable all the time . I have had some instances of trying to defog the windshield which I could find no suitable solutions between the inside and out fogging up. That was mostly situational due to outside humidity and temp but really I can't tell if its 67 degrees or not but I'm comfortable. In the winter having the heated seat and steering wheel option I'm comfortable in just a minute or two.

 

[danielspivey]

I really don't know what everyone expects. I have had my JTR set at 67 degrees and I'm quite comfortable all the time . I have had some instances of trying to defog the windshield which I could find no suitable solutions between the inside and out fogging up. That was mostly situational due to outside humidity and temp but really I can't tell if its 67 degrees or not but I'm comfortable. In the winter having the heated seat and steering wheel option I'm comfortable in just a minute or two.

Is this in auto or manual mode?

 

[uplandgunner]

Is this in auto or manual mode?

Trying to defog was in manual. It was about an hour after dark in and out of low areas about 65 degrees out with a very high dew point. When set at 67 and on auto I rarely have any issues and those issues are always about defogging.

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