This is what I’m talking about - that the components are the same but the logic of operation is different. Which module controls the dampers? HVAC? Maybe it’s its firmware that determines the sequence of work and algorithms? How would you find out?
I don’t know in what units you are more accustomed to measuring CO2 - for example, PPM. Also, I don’t know what standards are acceptable in your country. For example, our standard CO2 level is considered to be up to 1000 ppm. From 1000 to 2000 ppm is a dangerous level causing drowsiness, headaches, and from 2000 ppm and above is critical; prolonged stay in such an environment causes deviations in human health.
So, in recirculation mode with the windows closed, the CO2 level in the car when I’m driving alone exceeds 1000 ppm after 40 minutes of driving, and reaches 2000 ppm after 2 hours. When there are 4 people in the car, then in recirculation mode 1000ppm in 15-20 minutes. 2000 ppm after 1 hour.
Now to the problem itself - when the outside temperature is above 25 C/77 F and the AUTO climate control mode is turned on - the recirculation button does not light up although the damper closes itself. The driver simply does not see the problem, but after some time he may feel unwell for no reason. He is convinced that there is a lot of air, it is supplied from outside and recirculation does not work, although this is not the case.
As a solution, you are right - you can open the window. And the second way is to turn off the AUTO mode - in this case, the recirculation damper will respond to the open/close button and you will really be able to feel the fresh air.
It would be nice for someone to experiment with the recirculation flap on the restyled Ford Explorer 2017-2019 model in a hot region…
What equipment are you using to do ypur measurements. Pretty much ppm is a standard for measurement for gas concentration.
You don’t have to continually repeat the whole issue, we get the point, you’re making the thread difficult to read.
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You still haven’t responded to the question of what mods if any have been performed on the car.
Perhaps the best place for you to go as this is a Russian built vehicle is the actual ForScan site which has an extensive Russian presence.
I used several devices, one from a professional laboratory (I don’t remember the model) and then ordered a regular household co2 level meter from Aliexpress, model d9-h. The readings were quite clear and agreed with the readings of a professional device within a slight error.
I already wrote earlier that I did not make any changes to the configuration of the car and did not change any software settings.
Please forgive me, I was just not quite understood at first.
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There is no error here. It is programed this way on purpose. You are creating a problem based on your perception of how you think the system should work.
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Thanks for the information. You correctly indicated that the system can automatically close the external air supply damper - such information is indicated in the manual. This is how climate control works on any car. When there is a significant increase in temperature and you need to quickly cool the car interior. BUT! In all cars, the climate control system cannot independently block the supply of fresh air for more than 5 minutes - because this is a gross violation of the operation of the car and can cause a lack of oxygen, which leads to loss of driver attention and accidents. In my case, the system completely blocks the supply of fresh air for 5, 10, 20 and so on minutes - until you suffocate from lack of oxygen.
Cars are not fully seal from oxygen. It only closes off the air supply to the HVAC unit. There are plenty more areas where air is allowed into a car. The recirculation mode does the same thing and has been in cars for years!
I can’t agree with you here. Yes, there is a recirculation mode; turning it on stops the supply of oxygen from outside. In humid weather, windows can quickly fog up. But you control this yourself - if you want, you turn it on, and if you want, you turn it off. In my case, recirculation is turned on forcibly under certain conditions without the ability to turn it off. And read the topic at the beginning - if oxygen had been supplied to the car in a different way, the level of carbon dioxide would not have risen to a critical level, I measured it with special devices.
You could just remove the actuator that controls it and it would be open all the time than.
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