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Heat coming from A/C vents when heater is completely off??
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10-09-2007, 12:29 AM | #1 |
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Heat coming from A/C vents when heater is completely off??
So I never noticed this with my 335i sedan when I had it last winter, but two days ago while driving home in my 335i Coupe on a cool night in LA, I felt like my cabin was getting a bit warm. Weird considering it was 57 degrees outside.
I cracked my windows a bit to let some cool night air in. But then I decided to put my hand up by the A/C vents, and sure enough I could feel a slight "breeze" of really warm air coming from the vents. I looked down at my A/C controls and noticed everything was OFF. There was not one light lit up on the A/C console. It was obvious I was getting a bit of heat coming in from the engine, but shouldn't the vents be completely closed when the A/C-Heater is completely off? Am I missing something or have other people noticed a trickle of hot air coming from their A/C vents when everything is turned off? Thanks |
10-09-2007, 12:36 AM | #2 |
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If your car is not specifically set to recirc, or Auto recirc, it will be in fresh air mode. Air pressure as you drive will force air into the a/c system, and through your vents. I believe the system defaults to heat when it's shut off, so the air is passing through the heater core before it gets to you.
So yes, this is normal. =) |
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10-09-2007, 03:34 AM | #4 |
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the "rest" button?
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10-09-2007, 12:17 PM | #6 | |
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Quote:
To add to this: After awhile, the air coming through the vents will cool off (..providing the ambient air temp is cool), but it does take awhile. |
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10-09-2007, 12:25 PM | #7 |
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When my climate control is completely off (no recirc is set), all the vents are closed, so there is no passive air flow. To ventilate, I have to turn a fan or a/c on. Is it normal? Is it possible to vent not turning CC on?
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10-09-2007, 12:26 PM | #8 |
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I think you will find that it is due to the design of the car and the ducting, that if you drive the car after it has been warmed up but parked for a short time, the air coming out the vents will be warm. It is for me, and no amount of switching to recirc or not changes it. I believe that it is because the the air ducts are close to the engine compartment, and the air it it get's warmed up. The only way to fix it is to turn on the AC.
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10-09-2007, 12:51 PM | #10 |
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I get this too, but the heat is coming from the footwell area, and slightly from the regular vents...it's there, but not noticeable.
And someone my car smells like a baked potato
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