Idle temps 80-90C

m0no

macrumors regular
Original poster
Jan 8, 2009
222
0
I have a Macbook Pro 13 2.53 Core 2 Duo and lately it's betting getting extremely hot and even uncomfortable to work on. Idle temps are consistently between 80-90C. The fans don't even come on. I've looked at the fans and cleaned them, but it still doesn't help. Has anybody else experienced this? I guess my next step would be to replace the fan.

Any suggestions?
 

TheIguana

macrumors 6502a
Sep 26, 2004
656
389
Canada
What do you consider to be an idle workflow? The only reason I ask is what your using your Mac for could have a huge impact on the amount of heat it produces.

Have you tried watching the Activity Monitor while your using your MBP to see if any processes/things your doing are coinciding with it producing more heat?

Lastly, are you watching movies or using any kind of Flash content?
 

m0no

macrumors regular
Original poster
Jan 8, 2009
222
0
What do you consider to be an idle workflow? The only reason I ask is what your using your Mac for could have a huge impact on the amount of heat it produces.

Have you tried watching the Activity Monitor while your using your MBP to see if any processes/things your doing are coinciding with it producing more heat?

Lastly, are you watching movies or using any kind of Flash content?
There isn't anything running that takes up CPU. If I do other tasks such as view flash content or work in other applications then the temps will rise and be in low-mid 90s C.

----------

Open up Activity Monitor and sort the processes by CPU usage, find who the culprit is and kill that task, unless it's critical to the system

A nice way to monitor your fan speed and core temp. is SMC Fan Control, which displays it right in the menulet icons.

http://www.macupdate.com/app/mac/23049/smcfancontrol
Yeah, I do that. Nothing is taking up CPU usage. I have SMC Fan Control and fan speed is 0 all the time...so I think my next step is to replace the fan.
 

macdudesir

macrumors 6502
Jan 16, 2011
357
76
Blacksburg, VA
...are your fans ON? it sounds like your fans may be off...i assume you have something that can monitor fan speed considering you have something monitoring temp....since the temps are so high with barely any CPU usage, you fans may have died.
 

TheIguana

macrumors 6502a
Sep 26, 2004
656
389
Canada
Yeah, I do that. Nothing is taking up CPU usage. I have SMC Fan Control and fan speed is 0 all the time...so I think my next step is to replace the fan.
Sounds like it, can you hear the fan running at all on your Mac? Another thing you try is seeing if the fan cable has come loose.
 

orvn

macrumors 6502
Jan 11, 2011
258
0
Toronto, Canada
Disregard previous post, I didn't realize you meant that CPU use was 95+% idle. I thought you meant 95% was in use by something.. how odd.

----------



Aside from the fan itself, it could be the fan's heat sensor or even a faulty heatsink or thermal paste..
(sorry about throwing a multiplicity of possibilities at you)
 

m0no

macrumors regular
Original poster
Jan 8, 2009
222
0
Sounds like it, can you hear the fans running at all on your Mac? Another thing you try is seeing if the fan cable has come loose.
I don't hear anything. The fans used to run all the time and be so loud that is was annoying. I'll try checking the fan cable to make sure it's not loose.

I just remembered that I tried examining the fan several months ago, but the fan screw is stripped..now I remember why I didn't replace it before. So, if the fan is dead and can't be replaced is the only other option to replace the motherboard?
 

thundersteele

macrumors 68030
Oct 19, 2011
2,984
7
Switzerland
Yeah, I do that. Nothing is taking up CPU usage. I have SMC Fan Control and fan speed is 0 all the time...so I think my next step is to replace the fan.
Uhm, I would start by deleting SMC Fan Control, then resetting the SMC. Install something like iStatPro that tells you the current fan speed.
 

TheIguana

macrumors 6502a
Sep 26, 2004
656
389
Canada
I don't hear anything. The fans used to run all the time and be so loud that is was annoying. I'll try checking the fan cable to make sure it's not loose.

I just remembered that I tried examining the fan several months ago, but the fan screw is stripped..now I remember why I didn't replace it before. So, if the fan is dead and can't be replaced is the only other option to replace the motherboard?
If the fan has died the best thing you can do to get your temps down is to devise a way to get the stripped screw out and replace the fan.

Replacing the logic board won't solve the heat problem because you still won't have a mechanism to exhaust the heat.
 

Intell

macrumors P6
Jan 24, 2010
18,889
395
Inside
Uhm, I would start by deleting SMC Fan Control, then resetting the SMC. Install something like iStatPro that tells you the current fan speed.
smcFanControl does tell you the current fan speed and it can control them with better accuracy and stability then other fan control programs for Mac OS X.
 

orvn

macrumors 6502
Jan 11, 2011
258
0
Toronto, Canada
Thanks. I will try that.
Depending on which of the three fan screws it is, if worst comes to worst you could always dig a trench around the screw and grip it with some mini-pliers as seen in my thread from last night:

https://forums.macrumors.com/showthread.php?t=1300614

----------

Uhm, I would start by deleting SMC Fan Control, then resetting the SMC. Install something like iStatPro that tells you the current fan speed.
What's wrong with SMCfancontrol?
I've heard only positive things about it in the past?
 

m0no

macrumors regular
Original poster
Jan 8, 2009
222
0
Thanks for the suggestions. I was able to get the screw out! The rubberband trick didn't work, but I was able to use a small knife and carve a groove until I was able to turn the screw with the knife. Inside the fan was a big dust ball. CPU is surprisingly cool now, ~50c, but I did have it off for a bit while working on the fan and it was on a cool surface. I'll just wait and see if the fan comes on now.
 

ljonesj

macrumors 6502a
Oct 20, 2009
944
63
Kingsport TN
Dust and Lint are a problem in all computers that reminds me i need to actually clean the fan on my macbook i have not done it once since i got it i have cleaned the fan in my mini several times.
 

ljonesj

macrumors 6502a
Oct 20, 2009
944
63
Kingsport TN
that can work but i still like to get to the fans and take them apart enough to get the dust and lint out and if you have a cat the hair from it that float around
 

m0no

macrumors regular
Original poster
Jan 8, 2009
222
0
I just fire compressed air at it from time to time!
I do use compress air occasionally, but apparently that didn't help. I couldn't even tell this large dust ball was in the fan until I took it out.
 

ljonesj

macrumors 6502a
Oct 20, 2009
944
63
Kingsport TN
So does the fans now work i hate to see what a fan assembly cost for a macbook pro 15 oops my bad just re read the op post he said 13 in macbook pro but still hate to see the price of the fan
 

mgartner0622

macrumors 65816
Jun 6, 2010
1,018
0
Colorado, USA
As long as we're on this subject, if anyone is having horridly high temps, the first thing I do to check to see if the fan is working is open the bottom panel, carefully turn the computer on (don't let the bottom touch any surface, the last thing you want to do is pop a capacitor or any chips off the board) and check to see if the fans are spinning. I realize this is probably a bit late, but maybe it can help someone else.
 

m0no

macrumors regular
Original poster
Jan 8, 2009
222
0
Well, I think it's safe to say the fan is dead. It doesn't come on and the macbook actually shut down due to overheating while viewing flash content. Current cpu temp is ~103C. I guess I'll start looking for a replacement...looks like those are about $60. Although, I am thinking of trying to sell this and put any proceeds towards a macbook air.

Update: I was able to order a fan for cheap, so hopefully this will fix it...instead of using ice packs when doing heavy cpu tasks:D
 
Last edited:

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