Coming 10.6.8 my right fan is down and left fan is overworked

Coming OS 10.6.8 my right fan is down but my left fan is overworked; it works all time more than 4800 RPM.
may I go back to 10.6.7 ?

Hi Ray,
Try a SMC reset...
http://support.apple.com/kb/HT3964
Failing that you could download and install the Combo Update:
http://support.apple.com/kb/DL1399
Hope this helps,
Cheers,

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Model Identifier:          iMac12,2
Processor Name:          Intel Core i5
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L2 Cache (per Core):          256 KB
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SMC Version (system):          1.72f2
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Message was edited by: MacPro06

Hi MacPro06: The numbers you have posted are perfectly normal. 2000 RPM is the default fan speed for the newer MacBook Pros. 42 Celcius is also quite normal. Not sure why there is more noise, but the numbers are fine.
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Left fans don't work ?

My brand new Macbook Pro 13'', has a problem, I observed that it gets hot very much (i think) however the fans on the left side don't blow air out while the right ones do. Do left fans blow out air ?

denozi wrote:
Do fans take in air from left side and gives out from the right side ?
No. In your case the fan (singular) draws in air from both sides as well as the left rear and blows it out the right rear.
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Second, recognize that you're looking at the bottom, so, with the Mac right side up, the fan is on your right. The 15" rMBP has both built-in graphics and an NVIDIA GeForce GT graphics coprocessor which requires a second fan on the left side to keep cool. When you lift up the screen, you can see vent openings at the hinge, which the fan is pointed at and which you can also see in the picture.
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This question was solved.
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@gwatanaj ,
Hello and thank you for posting on the HP support forums. Here is a link that you may find useful.
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As well please include your Full Model and Product Number.
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Just to update....
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Yes, look in Activity Monitor (Applications /Utilities /Activity Monitor.app) and see what it eating up all the %CPU. If anything is over 40%, post the name here to get advice or just kill it straight away with the red 'Quit' button.
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http://support.apple.com/kb/HT3964

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Hello
I*ve been noticing that my Macbook 2ghz Intel Core 2 Duo (the old white one with FW400) has been getting louder the last few weeks. The fan is running constantly.
Today I checked with the Fan control app and the program says that my left fan runs with 600 rpm and my right one with -1 rpm
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Best greetings
David

There is only one fan in that machine. The app you're using is designed for use on any Mac. The 15 & 17" MacBook Pros have two fans.
However, your single fan should not be running at 6000 RPM (you mention "600", but I would imagine you meant 6000) unless there is a significant amount of activity going on. Are you doing anything in particular when you start to hear the fan running loudly (e.g. watching videos, playing games, etc)?

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Hi guys (and ladies...)!
I've installed SMC Fan Control on my MBP because it was running hot. Last summer (no, no, I didn't give you my heart...), I sent my MBP in for a logic board replacement, because one day the screen stayed obstinately dark, though I could hear the hard drive spinning... and the fans too!
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In System Preferences under PrefPanes, I can access my Fan Control preferences, and it shows one fan (the left one) running at almost 5000 rpm, and the other (guess what? yeah, the right one!) at 0, repeat, zero.
Something's wrong, right?

Just what I thought... OK, thanks, I'll bring it back in. I just hope they won't keep as long as they did last year (5 weeks to change a lousy logic board, can you believe it?)...
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Hi all,
I love my iMac. I've had it for nearly 8 months now. From day 1, I've been surprised by how loud it is under any significant CPU load. Unfortunately for me, I have waited until I'm well out of my phone support window to do anything about it. I have not yet purchased AppleCare.
As I type this, my CPU temp is 70 degrees C and fan is running at 2600 RPM, running nothing beyond the browser in which I'm typing. Should I attempt to work in iMovie and render said work to DVD (the reason I bought the machine), CPU temp will climb to ~76 and fan speed jumps to 4600-4800 RPM. At this speed, the noise is unbearable...but it is annoying even when idle.
Can any of you with this model of 17" iMac comment on your experience? Do these numbers and this experience sound normal? I know I'm not alone in this complaint, but I can't tell how widespread the problem is or whether my machine is normal or defective. I've been told by my local service center (CompUSA) that every single 17" iMac of this revision runs hot and has loud fans, and that there is nothing I can do short of complaining to Apple in the hopes of getting a replacement of a later revision. I was told by a "genius" at a different Apple store that my machine sounded about like he'd expect.
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iMac G5 17" Mac OS X (10.4.5)

Mine is still fairly new as I picked it up off ebay a couple weeks ago brand new. So I don't know when it was actually manufactured. The part of the noise that gets under my skin is that soft but constant background whining coming from the CPU fan. It doesn't really sound like anything rubbing or a bad bearing, just the sound that an electric motor makes. But, it just seems to resonate from the lower left hand side where the air intake is.
So quite accidentally one day I held my hand under the left hand side and it completely muffled the whine sound. You could still here the hum and the sound of air but the irritating element was gone. Playing around a little more, I opted to tape a business card under that lower left hand corner, bridging the gap from front to back to still allow an airspace for the fan's suction. It knocks out about 90% of the whine.
It's been running that way for two weeks with no ill effects. Yes, the fan speeds up and slows down when needed. Normal at rest RPM is 1500 and mid to upper 50's on the temp. The highest temp I've seen under max continuous load is 65 with the fan at 4000 rpm.
I did experiment with something longer than the business card but I did then see a decrease in cooling capability. The isight models have their suction ducted out the back and I bet that gets rid of that resonance.
So all in all it still makes less fan noise than my old B&W, it's just that the B&W wasn't up on the desk so close to our heads. But, If your fans are constantly on high, there is a procedure for resetting something in power management, I just can't find it right now. Hope this helps.

Coming 10.6.8 my right fan is down and left fan is overworked

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