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Severe Heat Issues
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Forum Regular
Join Date: Dec 2005
Status:
Offline
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I have a unibody MacBook Pro 15" from the first unibody lineup. It's about 1.5 years old (not under warranty).
All four Mac notebooks I've had have gotten hot, but it's getting ridiculous. smcFanControl reports that the temperature gets up to 100+ degrees celsius. That's the boiling point of water. I don't know if it's accurate, but that doesn't sound safe. It's unbearable to touch at times (left speaker).
The computer also goes into sleep/standby often, especially when on Boot Camp or doing heavy processes on OS X.
The fans almost always run at 6200 rpm. If I put a desk fan aimed right under the computer it helps significantly in both lowering the temperature and preventing it from going to standby. The computer always sits on a wood desk with nothing blocking it on any side. It's always plugged in.
This started about a month ago but is getting worse. I never had problems with it before then.
Any help is appreciated, thanks!
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15" MacBook Pro (unibody), 4 GB RAM, 2.53 GHz Intel Core 2 Duo, Mac OS X 10.6.2
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Forum Regular
Join Date: Feb 2004
Location: Doylestown, PA
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You may want to consider opening it up and cleaning out any dust thats built up in those two small heatsinks in the back. If air is not getting through there temps will run very high and the entire thing will feel hot as there's very little airflow through the machine.
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Forum Regular
Join Date: Dec 2005
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Originally Posted by Abit667 
You may want to consider opening it up and cleaning out any dust thats built up in those two small heatsinks in the back. If air is not getting through there temps will run very high and the entire thing will feel hot as there's very little airflow through the machine.
Hi,
Is there any kind of software fix to try first? Thanks.
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15" MacBook Pro (unibody), 4 GB RAM, 2.53 GHz Intel Core 2 Duo, Mac OS X 10.6.2
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Professional Poster
Join Date: Jan 2003
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Main thing to do first is to check in Activity Monitor (in the utilities folder in Applications) to see what's pegging the CPUs.
In Activity Monitor, set the drop-down menu at top right to "All Processes". Click the CPU tab at the bottom and see consuming the CPU.
Also, click on the System Memory tab, and see how many Page Outs you have.
Report back if anything seems unusual.
You've done a restart right? If there's a runaway process, that usually clears everything out...
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Administrator  Join Date: Apr 2001
Location: San Antonio TX USA
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Had a similar problem with my wife's MacBook yesterday. Nothing suspicious in Activity Monitor, but it was awfully warm. After a restart, it's nice and cool...
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Glenn -----OTR/L, MOT, Tx
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Addicted to MacNN
Join Date: Mar 2006
Location: California
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Had the same thing happen with my last gen of non-uni body mbp. I took out the battery, and running it plugged in only. Heat issue is gone.
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Posting Junkie
Join Date: Nov 2000
Location: in front of my Mac
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100C is nothing unusual for a CPU. My Penryn regularly ramps up to around there when it's crunching away at work.
Ambient temperature plays a significant role. Also, if you're charging the battery that will release extra heat that has to be dissipated by the fans too.
Intel CPUs will switch off (IIRC at 120C) before heat can do any damage. The same goes for the MLB.
If the heat becomes uncomfortable you should first check that you have no runaway processes and then consider ramping up the fans with smcFanControl.
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