How to get the A/C Recirculation to be Automatically On on Startup
10-04-2019, 01:15 AM
#1
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How to get the A/C Recirculation to be Automatically On on Startup
Trying my luck again to ask if anyone has a solution for this on a 2019 C43.
I would like to have the recirculate automatically on when I start up the car.
I would like to have the recirculate automatically on when I start up the car.
10-04-2019, 02:35 PM
#4
I have tried to figure this out too and have not been able to. Having climate control on automatically turns the recirculate off, and it appears to me you have to turn the recirculate on every time
10-04-2019, 07:38 PM
#5
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Out of curiosity, why? The air re-circulation can't be left on permanently. Even if you activate it manually it switches to fresh air after a while. It's not particularly healthy to keep circulating the same air in the air. There's a cabin air filter to filter the outside air, and I thought the A/C if left on automatic will use re-circulation to help cool down the interior faster as it sees fit.
10-04-2019, 08:06 PM
#6
Out of curiosity, why? The air re-circulation can't be left on permanently. Even if you activate it manually it switches to fresh air after a while. It's not particularly healthy to keep circulating the same air in the air. There's a cabin air filter to filter the outside air, and I thought the A/C if left on automatic will use re-circulation to help cool down the interior faster as it sees fit.
10-04-2019, 08:13 PM
#7
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That's why I said, as far as I know the AC decides on its own when to shut off outside air and circulate the air in the car instead to help cooling down the cabin. However, if the car is parked in the sun for a while the cabin air will be significantly hotter than the outside air, so cooling down the cabin will actually be slightly faster by using the cooler outside air which doesn't have to be cooled down as much as the much hotter cabin air. Theoretically yes, once the cabin is cool it takes less energy to keep the interior air cool if it doesn't have to take in outside air and cool it, however, the passengers need oxygen to stay healthy so a steady supply of fresh air is required and it's why the climate control won't allow cutting off fresh air supply permanently. As I said and this is even mentioned in the owner's manual, if you turn on re-circulation it will automatically turn it off on its own after a while to bring in fresh outside air.
Last edited by superswiss; 10-04-2019 at 08:15 PM.
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10-04-2019, 08:28 PM
#8
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That's why I said, as far as I know the AC decides on its own when to shut off outside air and circulate the air in the car instead to help cooling down the cabin. However, if the car is parked in the sun for a while the cabin air will be significantly hotter than the outside air, so cooling down the cabin will actually be slightly faster by using the cooler outside air which doesn't have to be cooled down as much as the much hotter cabin air. Theoretically yes, once the cabin is cool it takes less energy to keep the interior air cool if it doesn't have to take in outside air and cool it, however, the passengers need oxygen to stay healthy so a steady supply of fresh air is required and it's why the climate control won't allow cutting off fresh air supply permanently. As I said and this is even mentioned in the owner's manual, if you turn on re-circulation it will automatically turn it off on its own after a while to bring in fresh outside air.
10-05-2019, 01:06 AM
#10
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mosysav (10-05-2019)
10-05-2019, 08:50 AM
#11
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It can't be done, move on. Every vehicle has features others don't and that's for you to figure out before you buy. I personally hate auto start stop, the MB had a button to turn it off and others don't as an example.
10-05-2019, 10:09 AM
#12
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Well, once upon a time in the not so distant past, starting up automatically in Individual mode on a 2019 was not possible and I’d tell anyone with confidence just like you it wasn’t possible and to move on. Then out of the blue I was proven wrong. It can now be done with an external device that works though the CAN bus. Which is why started this thread in a bid to try again, perhaps there is a solution now.
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Jujigatame (10-06-2019)
10-05-2019, 11:00 AM
#13
MBWorld Fanatic!
Well, once upon a time in the not so distant past, starting up automatically in Individual mode on a 2019 was not possible and I’d tell anyone with confidence just like you it wasn’t possible and to move on. Then out of the blue I was proven wrong. It can now be done with an external device that works though the CAN bus. Which is why started this thread in a bid to try again, perhaps there is a solution now.
