I have a 2019 CX-5 Touring and I find the cabin temperature control extremely frustrating.
I don't put it on Auto because I like more air than I get with it on Auto..
I have to keep adjusting the temperature **** trying to maintain a steady temp, but it will be too cold and then too hot.
I know nothing about the way this temperature control system works in this vehicle, but it would be nice to set it and have it stay at the same temperature.
Any body had any issues like this or have any thoughts on this situation?
Thanks,

 

Do you keep your home thermostat at a set temperature?
Or do you keep adjusting it all the time?
Your CX-5 thermostat works the same way.
Only in auto-mode will it maintain (or attempt to maintain) the temperature you set it to.
It does this by automatically adjusting heat/cooling/air intake and blower fans.
It does not do this in manual mode without your manual input, which is why you constantly are adjusting it.
In auto mode you can shut off the AC and it will allow you to adjust your fan speed.
But you will not get any cooling if the temp goes above your set level.

 

My guess is human nature when it comes to comfort level. The vehicles DO keep an accurate temperature if set in auto but the people inside the cabin do not always adjust to that comfort level based on many human factors. Clothing, stress level while driving, the sun shining in a specific window and angle etc. The older people get and are the more they complain about the temperatures anywhere house care dining out etc. LOL

If someone wants to know the actual temperature of the air coming out of the HVAC system and top vent that has the highest flow just but a very inexpensive kitchen temperature gauge used for cooking.
These can easily be placed in many areas for a quick fast and accurate temperature reading.

I use them so often I have plenty on hand for myself and a few friends or good customers.

 

I'm going back to auto per your suggestion and see the results. I have stayed away from auto because it adjusts the blower speed and I like a lot of air and I think more air in the cabin helps with mixing the air and getting it into the rest of the car.
I also have a 2012 Camry and it doesn't have an "Auto", but the air coming out of the vents stays the same temperature.
I'm not sure why the Mazda temperature changes if it's not in auto.
The engine temp would remain the same once its warmed up and that's the source of heat, I guess the AC could be cutting off and on which is the source of cooling.
I keep the air on "recirculate" as not to bring in outside dust, etc.
Do you know what the system "modulates / controls" in Auto to maintain a consistent temperature?
I know it controls the fan and the air blend door and I guess it would turn on and off the AC, not really sure.
Thanks.

 

That's a good suggestion, I will give it a try.
You look like someone who likes to measure "stuff".
I can relate.
Thanks.

 

You have a cabin filter
You should not compare non-Mazda platforms
Your engine coolant when you use the heat will be slightly cooler because of how the HVAC system works on most all platform at least from 2002 to present.
The factory blower motors have a reduce CFM to compensate for blower air noise. This was a complaint on many platforms and many auto manufactured now use lower CFM rated blowers for reduced noise. You can change your blower motor and have increased blower/Air CFW efficiency which will effectively increase the temperature time balances in your passenger compartment.
You have a HVAC
Climate Temperature Sensor


I seldom ever use the Auto temperature feature. If the wife complains then because of dual temperature controls, set individual manual setting and she adjust her side. LOL

 

One of the things I was wondering if the Ambient Temperature Sensor might be bad.
The blower did have to be replaced not long after I got the car and maybe something wasn't reinstalled properly, but I don't know where it is to even check to see if it's plugged in or not.
That's one reason I thought it would be helpful to reach out to people that know a lot more than me on this forum.

Another thing I thought of is I have is a phone holder in the driver's side air vent and I'm wondering if the could be part of the problem. It covers almost half the vent.

 

I recommend having an experienced Automotive technician check your ambient temperature sensor. generally speaking, if your AC compressor kicks on and the defrost is working your ambient outside temperature as well is reading correctly based on a close comparing what your cell phone states the weather temperature is then it is unlikely it is bad. But its located in a PIA are to get to on your Mazda in front of the condenser. It is a sure thing that you will need a few new plastic fasteners to replace just accessing it.

 

As Callisto said: you have a filter against outside dust.
With your recirculation always on, your car has more trouble drying the cabin environment against fogged windows. If you don't let in enough fresh outside air, the air quality in the car will decrease more than the outside air.
Let the "auto" mode do its job. It is quite "intelligent". It chooses which ventilation openings, the fan position, the AC, the ventilation air temperature and continuously adjusts this to the changing outside and inside air temperatures. It even checks the amount of direct sunlight through your windscreen. Only when I am behind a smelly car or driving past a manured field do I temporarily switch on the recirculation.

 

Yup!

I also recommend at least once a year to do a HVAC system cleaning. Anyone can do this and you don't even need to be a DIY
This will eliminated bacteria and other built up crap in the HAVAC system that often causes foul or stale smells in your vehicles.
Also replace or clean your cabin filter at least every season change.