Climate Control - Same Temp Despite Setting

I have a 22 OR with 3K miles on it. I was driving to work today and cranked my heat up to 78 from 72. I felt no change in the temperature… even up to 80. Only on HI did I feel blasting heat. Auto was off.

I then turned the climate system completely off, but hot air was still coming out of the vent. Why?

I then turned it back on and all the way down to LO and let it run for a while before putting it back to 78. Only then I was able to detect accurate temperature.

This seems weird. Any ideas?

 

If it does it again or consistently, warranty it.

These trucks naturally bleed air when turned off, and will do so at the last thermostat (blend door) setting. That's normal. The rest is likely a case of fiddling with the controls faster than the ambient temperature sensor is equilibrating. But again, set it, let it sit, and see if it does it over multiple drives.

 

With the climate control off, you can still "vent" air. If your sunroof or any window is cracked open, it will draw air through the heater core/evap core (depending on blend door position) and out the vent. Turn on recirc with fan off and it will stop the vent function.

I can usually tell a change between a few degrees almost instantly so I'd say you probably had a malfunction. Hopefully not repeatable.

 

You need to use auto. The temps are meaningless when not in auto mode. The temps essentially reflect what is the old blue to red knob in older manual climate controls. If you scaled it out on one of those, 72 to 78 is barely changing anything.

If you use auto mode, it will blow heat until the temp you selected is reached, meaning it would actually achieve 78 degrees. It will primarily blow it at the floor, and some through the outer vents and the defrost. The purpose of that is to not melt your face off by blowing it through the 4 chest height vents. Put it on auto, set a temp and forget about it.

Hot air coming out of the vent when off is because it lets outside air in. I'm not sure if it defaults to sending the air through the heater core or bypassing the heater core but I've noticed in the summer the draft is cooler and in the winter it's warmer. It might run the draft air through whatever heat exchanger (heater core vs AC evaporator) depending on what you last used.

 

I have a '22 SR and I've noticed similar things on occasion to you but maybe not as extreme. As mentioned above it can take a little bit of time for it to adjust. The other interesting thing I've noticed on mine is that if I have it set to, for example, 72 and it is 40 degrees outside the air is warm but if it's warmer outside the air blowing is cool. I'm assuming it has some kind of logic built in related to the outside air temperature. Maybe that is also plays a role in why yours is not functioning correctly? If/when you take it in I will be very interested to see what they say or how it's fixed.

 

That's the whole purpose of auto mode....to act like a house and bring the temperature to what you want it to. If you want it 72, then it works to achieve that whether it takes cooling or heating to do so.

 

If conditioning the cab, heat or cool, always be on recirculate. Otherwise you always are fighting outside air.

If you don't need to condition, turn off recirc to introduce ambient air if you wish, at the blower speed you wish.

 

Remember when all we had was this:




Now we're bitching that our DUAL ZONE auto-climate controls don't hit the exact temperature. Do you people ride around with a portable thermostat and verify "I set it to 75, but my reading is only 73!"

 

I hate the auto feature...on any vehicle. I keep it manual all the time. I prefer to have a very low setting of super hot or cold air instead of the truck automatically raising or lowering the fan speed and air temp at its will.

 

And dual zone is stupid. How long do you suppose it takes the air in a cab to blend into one temp? Pretty quick.

 

What is the reasoning behind all of that? I'd rather have it at the temp I want, whatever it takes to get there.

 

People completely miss the point of dual zone. It's not to get the truck cab to two temps, obviously that is not possible. The purpose is to have two people have completely different temps blowing at them if they want.

 

I agree with the above statement regarding the digital numbers are meaningless when on manual. The dials are not thermostats. It is more or less the same temp coming out at 70 and 74. The truck is basically converting a continuous range of single digit degrees into ~4 air temps - cold, cool, warm and hot based on my observations. I have not read the manual. Makes sense then that auto would either use just hot or cold air to drive cabin to setpoint, then shut down. I do not use auto either for that reason.

 

Personal preference. I like the feeling of the hot air at my feet with a window cracked. My dad smoked in the truck growing up so I learned to enjoy the floor heat with a crisp flow of air.

 

I know that. But my passenger can put on a jacket & gloves, or remove the, as they see fit.

 

I've had my truck on auto with the temp set at 70 since I bought it. It sets the mode and fan speed it needs to maintain that temperature and has worked perfectly since day 1. On the rare occasions it needs heat here in south Florida it takes care of it. It's basically a set it and forget it for me.

 

I know the temps are not exact and I don’t expect them to be. My point was that I should feel a change from 72 to 78 and I did not.

 

if the temp change difference is not that much (like in your case), it will have a proportional response. In other words, if you have been leveled out at 72 for while, and change up down a few degrees, the Auto will simply adjust the blend doors to release or hold more heat. If you went from a leveled out 55 degree cab and turned it up to 78, it would turn up the fan, probably adjust output vents, and open the blend doors more.

 

I think OP is talking about manual mode. I also have similar "issues" that when in manual there are not consistent temps. For example, I have it set at 70 and one day it will blow cold air and another day it will blow hot air. I also wondered if outside temp plays into the blend door position. Anyway, it doesn't really behave like I expect or like my previous 2nd gen. I'd love to know how it determines the blend door position in manual because it doesn't seem like it is a linear scale min to max based on what you set the dial to. So I just use it in auto mode all the time now and it does what I want it to. One of the quirks of my '21 that I never really figured out. Very interested in what others think as well.

 

ahhh, gotcha

one thing to consider then is, if the recirculate is on or not, since the air from outside can be extremely hot or cold, humid or dry, when compared to the in cab air.

My GF has fits with her 4R, she just can't leave the MF'er alone, she HAS to control it, so rather than choosing Auto, she drives with her hand on the knob constantly and is fucken with the temp, fan speed, and sometimes the vents. Of course almost always forgets to turn it back to Auto before exiting the truck, so upon return she'll use the remote start, and it will be set on 'Low' and the outside temp is 15 degrees
I can't figure out for the life of me, why folks can't find a temp they like and leave it alone #controlfreaks