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Old 06-28-2012, 09:02 AM   #1
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Leaving the A/C on

Today in southern Indiana it will be about 104 degrees. Toasty!

It made me think this morning... is there any problem in leaving the A/C on when shutting my 2003 Wrangler Sport off? What about having the A/C "on" when starting the car in the morning.

I doubt there's a big deal, but I'd appreciate hearing other opinions...

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Old 06-28-2012, 09:28 AM   #2
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Been in the automotive business for over 40+ years. I was taught in the beginning, and also taught my 4 children, to always turn off everything before turning off the vehicle. I believe the electrical stress on any component (Radio, AC compressor, etc) is the main cause of early failures. The proof in my head is that having owned many many vehicles in the past none of them had failures in the electrical components.

I am sure there will be many posts refuting this but then this is my personal feeling and you should do what you think is best for you.

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Old 06-28-2012, 09:43 AM   #3
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I always turn off A/C or any other large current draw on my vehicles as well and it is best to start with the least draw on your electrical system as well, ie 4000w fog lights, etc... Radio, eh, I don't worry about that.
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Old 06-28-2012, 09:43 AM   #4
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Turn everything off before shutting down the engine.

With airconditioning you should turn it off about 2-3 minutes before the engine to help dry everything out. This will help prevent mold build up inside the system.
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Old 06-28-2012, 09:57 AM   #5
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When It first started getting hot here I left my AC on for a few days but the blower was off. I didn't even think about it. And nothing went wrong, but now when I use the AC I turn it all off. But I don't really know if it makes any difference on or off.
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Old 06-28-2012, 10:02 AM   #6
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I'd bet that there is a delay on the AC clutch and it wont engage until the engine is running. Its as simple as watching the compressor while you start it to see if it spins right away. I like to turn mine off a few minutes before I get home to get the moisture out of it so it doesn't smell musty when I turn the vents on the next time.
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Old 06-28-2012, 10:23 AM   #7
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I do notice a hard start once in a while if i forget to shut it off and start it again with the a/c on. Draws so much power.
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Old 06-28-2012, 02:29 PM   #8
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I'd bet that there is a delay on the AC clutch and it wont engage until the engine is running. Its as simple as watching the compressor while you start it to see if it spins right away.
Correct ^^^^^

I leave everything on except the lights, I have been doing it that way for years with no problems
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Old 06-28-2012, 03:58 PM   #9
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I personally turn everything off. My wife is just the opposite. You turn the key on and music starts blaring and the fan is going full blast

Doesn't seem to hurt her vehicles any though.
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Old 06-28-2012, 04:25 PM   #10
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I have remote start on my TJ. I always leave my ac on and in full blast mode. Have never had a problem and it is cold when I get in. 203* weather is to hot to get into a hot jeep
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Old 06-28-2012, 04:36 PM   #11
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I am a Ase Master Tech. I see no issue with leaving the A/C on,My personal Ford F150 with ATC style is always been left on Auto & 75 degrees year round it's got 86000 miles on it & works as good as it did when I drove it off the Dealer's lot brand new in 2005,I have left it on in My TJ from time to time but since it has a Safari top on it now I haven't used it much.
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Old 06-28-2012, 04:54 PM   #12
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Is there an on/off switch on a 2005 Wrangler, or is it all controlled by the selector knob?
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Old 06-28-2012, 05:42 PM   #13
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Quote:
Originally Posted by OrangeCrush
Is there an on/off switch on a 2005 Wrangler, or is it all controlled by the selector knob?
All controlled by the selector knob. You'll notice on the selector knob there are a couple of settings with snowflakes on them = A/C. Also defrost will engage the A/C compressor. The only ones that don't are just floor or just upper. Leaving the knob on A/C with your Jeep off will not have any ill effects on the compressor or clutch. Max A/C is the one showing recirculating air in the Jeep.
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Old 06-28-2012, 06:07 PM   #14
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Like mentioned earlier, there's a delay when starting so you don't have to worry about extra stress on the compressor. The next time you start your jeep listen for the clutch engageing...it's around 2-3 seconds after starting. Like 20ga I always turn it off a few miles from home if i'm not going anywhere later to let the evap dry out. Even if you get mold it's not a big deal...napa sells a good fungal kit that sprays foam up the evap drain.
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Old 06-28-2012, 10:02 PM   #15
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Quote:
Originally Posted by OrangeCrush
Is there an on/off switch on a 2005 Wrangler, or is it all controlled by the selector knob?
One of the first mods I did was to install a toggle switch to turn the A/C on and off.. Just tap into the ground wire and run it up to the toggle. I mounted mine on the center counsel just above the 4x4 lever.. I'm old school, I shut off all accessories while I let the engine warm down for at least 2 minutes before shut down.. I also let my engine warm up for a few minutes before I turn any accessories back on..
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Old 06-28-2012, 10:17 PM   #16
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In Indiana too and today was the first day I ran the A/C. Sure enough my TJ threw a check engine light at me. Leak Detection Pump and Speed Control Solenoid. I hear bubbling under the hood and it idles rough with the A/C on.
...and I can't do anything about it cause it's too friggin hot out!
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Old 06-28-2012, 10:28 PM   #17
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Check all the vacuum lines around the LDP, purge solenoid, canister, intake manifold. Probly worn from a hot engine. The speed control lets your car increase its idle speed under a greater load, like running the ac compressor. Should be ok til you fix it as long as you dont idle with ac on for extended lengths of time. Extra stress on your engine.
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Old 06-28-2012, 10:47 PM   #18
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Originally Posted by salty jalapeno View Post
Check all the vacuum lines around the LDP, purge solenoid, canister, intake manifold. Probly worn from a hot engine. The speed control lets your car increase its idle speed under a greater load, like running the ac compressor. Should be ok til you fix it as long as you dont idle with ac on for extended lengths of time. Extra stress on your engine.
Hey thanks! I'll follow your advice this weekend. I really appreciate it.
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Old 06-28-2012, 11:20 PM   #19
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Quote:
Originally Posted by AFGUY1980
I have remote start on my TJ. I always leave my ac on and in full blast mode. Have never had a problem and it is cold when I get in. 203* weather is to hot to get into a hot jeep
203 degree weather? Don't you mean 103?
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Old 06-28-2012, 11:49 PM   #20
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I stand corrected. Yes 103
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Old 06-29-2012, 01:43 AM   #21
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Shoot I've fixed the electrical A/C gremlins so many times in my TJ I'm afraid to turn it off
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Old 06-29-2012, 02:33 AM   #22
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Holy crap are some of you paranoid!!!

Personally, I turn the fan up to 4, make sure the defrost is on, push in the cigarette lighter, and turn the radio up to 11 - all right before i get out.

On my way into the house from the garage, I walk under a ladder, step on the foul line, AND run with scissors. Amazingly, I'm still alive


(this was all very tongue in cheek, please dont get too cranky I'm just trying to have a little fun )
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Old 06-29-2012, 07:49 AM   #23
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weather you leave the AC on in the summer or the heater on(cept floor mode) in the winter it will have the same effect-the compressor will run. I personally (usually) turn off everything so i don't have 'classic vinyl' blareing on the radio, hot air blowing in the summer or cold air blowing in the winter. now on my pickup w/remote start i still turn off the radio, but will set heater/AC (depending on season) so its comfey by the time i get in it. before the pickup(1st remote start) i was pretty much 'old school' (pretty much still am) and turn everything off. i also turn off the light when i leave a room unless someone else is still in there, or leave the faucet on in the sink-guess it's all in the way you were raised.
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Old 06-29-2012, 08:00 AM   #24
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Quote:
Originally Posted by gmiller0737
I am a Ase Master Tech. I see no issue with leaving the A/C on,My personal Ford F150 with ATC style is always been left on Auto & 75 degrees year round it's got 86000 miles on it & works as good as it did when I drove it off the Dealer's lot brand new in 2005,I have left it on in My TJ from time to time but since it has a Safari top on it now I haven't used it much.
What is an ASE master tech? I had a service tech make a road call for me a while back, he fiddled around with the laptop for over an hour ... I suggested a mechanical problem and he blew me off. Finally, as I was fed up with his fumbling around with his laptop, and complaining about all the computers on my tractor,,, I got my ball pean hammer and my 2 ft long hickory stick, layed in on the starter, gave it a good wack,, we could hear the bendix slide, and the truck fired right up... He never even apologized for a very poor service call, and billed my company for the entire time he was there... He too was some sort of " master tech "
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Old 06-29-2012, 12:44 PM   #25
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Originally Posted by Rubicondon53

What is an ASE master tech? I had a service tech make a road call for me a while back, he fiddled around with the laptop for over an hour ... I suggested a mechanical problem and he blew me off. Finally, as I was fed up with his fumbling around with his laptop, and complaining about all the computers on my tractor,,, I got my ball pean hammer and my 2 ft long hickory stick, layed in on the starter, gave it a good wack,, we could hear the bendix slide, and the truck fired right up... He never even apologized for a very poor service call, and billed my company for the entire time he was there... He too was some sort of " master tech "
Automotive Service Excellence meaning that person has passed all 8 of the required tests to become master certified. It's the automotive industries standard for skill and quality in automotive repair.
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Old 06-29-2012, 01:43 PM   #26
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Originally Posted by netlohcs
Holy crap are some of you paranoid!!!

Personally, I turn the fan up to 4, make sure the defrost is on, push in the cigarette lighter, and turn the radio up to 11 - all right before i get out.

On my way into the house from the garage, I walk under a ladder, step on the foul line, AND run with scissors. Amazingly, I'm still alive

(this was all very tongue in cheek, please dont get too cranky I'm just trying to have a little fun )
Lmao .
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Old 06-29-2012, 06:21 PM   #27
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All controlled by the selector knob. You'll notice on the selector knob there are a couple of settings with snowflakes on them = A/C. Also defrost will engage the A/C compressor. The only ones that don't are just floor or just upper. Leaving the knob on A/C with your Jeep off will not have any ill effects on the compressor or clutch. Max A/C is the one showing recirculating air in the Jeep.
The "recirculating" air option, when I have this on, I feel the Jeep doesn't get as cold as if I leave it on the other two settings. What does this setting do?
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Old 06-29-2012, 07:34 PM   #28
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I dont even know if the AC works in my Jeep(just kidding, I think). I took the doors and top off the day I bought it. Now the heat, it works well, even going down the highway with the top and doors off. I hate Missouri weather. 98 during the day, 55 at night. People always ask why I keep a fleece jacket in my jeep all summer. There's a reason for the madness.
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Old 06-29-2012, 08:02 PM   #29
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The "recirculating" air option, when I have this on, I feel the Jeep doesn't get as cold as if I leave it on the other two settings. What does this setting do?
It seems odd to me that you would feel less cooling when you have it set to the recirculate setting. The Recirculate A/C setting = Max Air, and like the little Jeep with the arrow icon shows, on that setting the blower recurculates the air inside the Jeep only. Every other setting (A/C or Vent or Defrost) draws outside air into the Jeep.
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Old 06-30-2012, 06:24 AM   #30
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Originally Posted by netlohcs View Post
Holy crap are some of you paranoid!!!

Personally, I turn the fan up to 4, make sure the defrost is on, push in the cigarette lighter, and turn the radio up to 11 - all right before i get out.

On my way into the house from the garage, I walk under a ladder, step on the foul line, AND run with scissors. Amazingly, I'm still alive


(this was all very tongue in cheek, please dont get too cranky I'm just trying to have a little fun )
You should stop running with scissors.

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