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AC turns on by itself

 
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Old 11-21-2010, 06:24 PM
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AC turns on by itself

The bulb is burnt out in the button, but I can tell the AC is on because it takes more to get it going in 1st gear and I can feel it when I turn on my fan.

Also when I start my car it revs for a while. Usually from 1500 to 1800. After a while it idles normally.

Why does this happen?
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Old 11-21-2010, 06:53 PM
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Re: AC turns on by itself

my ac automatically turns on when i put it on the defrost for the front windshield .
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Old 11-21-2010, 07:48 PM
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Re: AC turns on by itself

Hmm, I dont recall if my defrost was on, but it could've been, either way though, why does it do that?
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Old 11-21-2010, 07:53 PM
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Re: AC turns on by itself

when the ac is on it helps defrost the front window because some reason that i have no clue about and wont pretend to :P lol

i usually just turn off the ac when it automatically turns on, you should change that light I dont think its too tough, i dont know though
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Old 11-21-2010, 07:54 PM
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Re: AC turns on by itself

the ac will take the condensation off the winshield ... its auto on with the defrost for that reason .. clears the windshield almost instantly ..
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Old 11-21-2010, 07:55 PM
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Re: AC turns on by itself

Quote:
Originally Posted by element600rr View Post
the ac will take the condensation off the winshield ... its auto on with the defrost for that reason .. clears the windshield almost instantly ..
yeah his sounds quite a bit more professional
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Old 11-21-2010, 08:08 PM
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Re: AC turns on by itself

What about the rev'ing on startup?
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Old 11-21-2010, 08:16 PM
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Re: AC turns on by itself

thats just your car warming up lol, right now its like 20 degrees here and mine stays around 2k rpms for a little and then works its way down, nothing to worry about
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Old 11-21-2010, 08:17 PM
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Re: AC turns on by itself

What made me bring up the question was this thread.
They say its not normal.

And the air cooland cant be the issue since my car regulates a temp a little below the middle.
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Old 11-21-2010, 08:18 PM
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Re: AC turns on by itself

ah you mean it jumps from 1500-1800 rmps? sorry i just re-read it
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Old 11-21-2010, 08:20 PM
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Re: AC turns on by itself

its probably your IAC valve or your fast idle valve, happened to me also
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Old 11-21-2010, 08:42 PM
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Re: AC turns on by itself

Quote:
Originally Posted by BlaqkLabel View Post
What about the rev'ing on startup?
it is normal to idle up until the engine warms up ( the unsteady idle is a diff issue ) thats a fast idle up and down not just a higher idle .. just because your car temp stays right where it should dose not mean its topped off propelry either by the way .. just means there is enough coolant to regulate the temp .. my car hits close to 2k on start up then idles around 1500 for a min or so as it warms up it goes lower and lower .. ( NORMAL )
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Old 11-21-2010, 08:44 PM
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Re: AC turns on by itself

Quote:
Originally Posted by element600rr View Post
it is normal to idle up until the engine warms up ( the unsteady idle is a diff issue ) thats a fast idle up and down not just a higher idle .. just because your car temp stays right where it should dose not mean its topped off propelry either by the way .. just means there is enough coolant to regulate the temp .. my car hits close to 2k on start up then idles around 1500 for a min or so as it warms up it goes lower and lower .. ( NORMAL )
his is jumping from 1500-1800 rpms
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Old 11-21-2010, 09:00 PM
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Re: AC turns on by itself

Quote:
Originally Posted by keeganhmorgan View Post
when the ac is on it helps defrost the front window because some reason that i have no clue about and wont pretend to :P lol

i usually just turn off the ac when it automatically turns on, you should change that light I dont think its too tough, i dont know though
The A/C removes humidity from the air, so that is why it comes on with the defrost.
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Old 11-21-2010, 10:27 PM
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Re: AC turns on by itself

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Originally Posted by BlaqkLabel View Post
What about the rev'ing on startup?
automatic choke.

and yes my car too if you turn on the defrost it will automatically turn on the AC, clears the windows faster, I don't know the science behind it but it does.
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Old 11-21-2010, 11:24 PM
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Re: AC turns on by itself

Quote:
Originally Posted by keeganhmorgan View Post
its probably your IAC valve or your fast idle valve, happened to me also
So did fixing/replacing the IAC valve stop the jumping?

Is the replacement an easy fix?
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Old 11-21-2010, 11:31 PM
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Re: AC turns on by itself

haha yes a very easy fix, you can try just cleaning the fast idle valve and iac valve (idle air control valve) and if that doesnt fix it replace them
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Old 11-22-2010, 12:43 AM
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Re: AC turns on by itself

Could you direct me to a tut. or something that can help me through this process?
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Old 11-22-2010, 01:56 AM
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Re: AC turns on by itself

google it or search it on here
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Old 11-22-2010, 03:08 AM
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Re: AC turns on by itself

*Ignore all previous replies*
You have a ghost.
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Old 11-22-2010, 05:44 PM
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Re: AC turns on by itself

^WTF? lol Yeah u got a ghost that wants to be cold


yeah I've always noticed that the ac comes on when u put it on defrost.. I use to switch it off and my windows would stay foggy lol

Did u ever find out if it was just that or was it actually just turning itself on? Lol

And about the high idle.. There's a sticky thread on here that I'm sure will fix the problem
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Old 11-24-2010, 02:42 PM
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Re: AC turns on by itself

The jumping idle only seems to happen when its cold.

The last few days have been warmer out and when I start my car it doesnt do that.
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Old 11-24-2010, 03:24 PM
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Re: AC turns on by itself

YEa it's normal bc here in NY it's like 40-50 degrees in the morning n mine is at around 2000RPM but after a few min it slowly decreases and stops at the normal 900RPM.

When the cold air is hitting the outside window while the warmer air is on the inside that it causes moisture to build upon the window causing condensation inwhich in order to remove it you have to fight cold air with cold air and not hot or your window will become fukky...I mean foggy!!!
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Old 11-24-2010, 07:43 PM
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Re: AC turns on by itself

Yours stops at 900RPM?

Once mine warms up it idles at about 700-800RPM's.
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