Thoughts on AC being left on. - Club Crosstrek | Subaru XV Crosstrek Forums
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Old 05-07-2017, 03:22 PM   #1
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Default Thoughts on AC being left on.

I'm just wondering everybody's thoughts leaving the AC on when you shut the car off/being on when you restart the car. My dad always made sure the air was off before he shut the car off so naturally I do the same. But I've always thought the majority of car owners did that. Recently I've noticed not that many people (at least people that I know) don't really worry about it. Is there advantages to doing so or am I just being overly cautious?

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Old 05-07-2017, 04:38 PM   #2
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Originally Posted by hayden802 View Post
I'm just wondering everybody's thoughts leaving the AC on when you shut the car off/being on when you restart the car. My dad always made sure the air was off before he shut the car off so naturally I do the same. But I've always thought the majority of car owners did that. Recently I've noticed not that many people (at least people that I know) don't really worry about it. Is there advantages to doing so or am I just being overly cautious?
Running the A/C creates condensation all throughout the system, and if it's not dried out, you develop mildew and the nasty smell that goes along with it.

What you're "supposed" to do is turn your A/C off a few minutes before you shut the car off, so that the vents and what not can dry out. If that's what you're saying you do, then yes there is an advantage to doing that.

If you're saying you shut it off just moments before turning the car off, then no there is no benefit to that. It's no different than just leaving it on.
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Old 05-08-2017, 04:01 AM   #3
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He's exactly right. Also adding that the fact the AC is on when you go to start the car takes a massive toll on the battery. If your battery is low, you'll not turn over and get the dead clicking. Always. Always. Always. Turn off the AC before turning off the car.
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Old 05-08-2017, 04:30 AM   #4
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I always shut my AC off at least a minute or two before I shut the car off, but I figured something major like this would be more widely talked about. I've never heard anyone even mention it except for my dad.
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Old 05-09-2017, 05:45 PM   #5
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It makes for unnecessary strain on the engine/alternator/battery on start-up. My wife constantly leaves the heater/AC, headlights, radio on when she shuts the car off. It drives me completely insane.

I won't get into her parking brake habits but when she was stranded with a dead batter after work last year I basked in the glow of sweet, sweet "I told you so".

In all seriousness, its probably not THAT big of a deal. Modern cars should be able to handle the added strain. I guess its open to interpretation much like break-in procedures and how long to let the car warm up before driving.
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Old 05-09-2017, 07:18 PM   #6
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From what I've seen, most modern cars won't engage the AC clutch until a few moments after startup. My Crosstrek seemed to do that. I have one of them plagued AC Compressors that I never took care of, so I count feel and hear, very well, when it engaged. But recently, it's started engaging RIGHT when I start the car, so this week I've been turning it off when I park.


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Old 05-10-2017, 07:28 AM   #7
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I have noticed subie was kind enough to make the AC disengage at WOT. Thanks scooperpoo!
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Old 05-10-2017, 07:54 PM   #8
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I have noticed subie was kind enough to make the AC disengage at WOT. Thanks scooperpoo!
Yup. That feature, though, has been on many modern cars for years now. Originally, I discovered the feature as a cop car feature while browsing AC system behaviors.
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