# AC on = higher idle? wtf.
**URL:** https://forums.speedlife.net/t/ac-on-higher-idle-wtf/88727
**Category:** SON240sx Automotive
**Created:** [September 14, 2005, 5:22pm UTC](https://forums.speedlife.net/t/ac-on-higher-idle-wtf/88727 "2005-09-14T17:22:15Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@cloudzero3](https://forums.speedlife.net/u/cloudzero3)
#### Post date: [September 14, 2005, 5:22pm UTC](https://forums.speedlife.net/t/ac-on-higher-idle-wtf/88727/1 "2005-09-14T17:22:15Z")
Ok, so I still haven’t fixed the “vacuum leak” (and i put it in quotations because i’m not 100% sure what my problem is anymore), and this morning when I was driving to uni my car started acting up.
First my AC wasn’t on… and I noticed that before then, my idle would be 500-600ish and ready to **stall** out almost every time i brought the car to a stop. It started getting humid in my car and outside was loud and smelly, so I just turned on my AC. I realized right away that the RPM had jumped right up to 1000 and stayed there. I thought to myself “okay…wtf…” So i turned it back off… down to 600… back on… up to 1000… etc. etc., to make sure that the AC was the culprit. Turns out that this happened EVERY time I turned my AC on or off…
I noticed, also, that with the AC on, the engine made a bit of a wheezing noise, and my RPM would randomly rocket up to 1900 (usually around 1500 though)… and then go back down to 1000.
WTF is up with my car? lol.
edit: all this AC on/off business was while the car was at a STOP (ie. red light or stuck in traffic)
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### Author:  [@slipperysilvia](https://forums.speedlife.net/u/slipperysilvia)
#### Post date: [September 14, 2005, 5:26pm UTC](https://forums.speedlife.net/t/ac-on-higher-idle-wtf/88727/2 "2005-09-14T17:26:19Z")
idle should be around 1000-1100 with the a/c on…7-800 with the a/c off…whining noise will be ure compressor, which is normal for nissans.
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### Author:  [@cloudzero3](https://forums.speedlife.net/u/cloudzero3)
#### Post date: [September 14, 2005, 5:30pm UTC](https://forums.speedlife.net/t/ac-on-higher-idle-wtf/88727/3 "2005-09-14T17:30:37Z")
Hmm. Didn’t know that.
Thanks, but do you know anything about the RPM randomly moving up to 1900 and back down? :shock:
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### Author:  [@slipperysilvia](https://forums.speedlife.net/u/slipperysilvia)
#### Post date: [September 14, 2005, 7:24pm UTC](https://forums.speedlife.net/t/ac-on-higher-idle-wtf/88727/4 "2005-09-14T19:24:07Z")
vacuum leak, bad maf, bad ground, bad IAC valve…one of those will solve it…