Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

470 Questions View all

The Fan make scrapping noises!

iMac Intel 24-inch Mid 2007


I have successfully installed SSD harddrive in my imac, thanks to your howto articles. But the Fan always running and make a noises, the sensor is installed on new SSD harddirve. and SSD Fan Control app also installed. But any way the Fan noises is louder than with original Sata drive.

Screenshot from the SSD FAN spped



Hi, her is my imac details:


Model Name: iMac

Model Identifier: iMac7,1

Processor Name: Intel Core 2 Duo

Processor Speed: 2,4 GHz

Number of Processors: 1

Total Number of Cores: 2

L2 Cache: 4 MB

Memory: 4 GB

Bus Speed: 800 MHz

Boot ROM Version: IM71.007A.B03

SMC Version (system): 1.21f4

Serial Number (system): W8735A73X89

Hardware UUID: 00000000-0000-1000-8000-001B639F5B4D


Answer this question I have this problem too

Is this a good question?

Score 1
Add a comment

1 Answer

Most Helpful Answer

A fan thats making a scraping sound is likely ready to fail as the fans bearing is worn-out.

I would start there replacing it:

  • Hard Drive Fan 922-8154
  • Optical Fan 922-8152

If you suspect the HD temp sensor is bad you could also try replacing it:

  • HD Temp Sensor 922-8165

The fact you have both sensors set to manual control (over-riding the sensors) is not a good idea! Frankly, you shouldn't need any controls (even with a SSD). What you are doing is over-riding the internal systems heat management system (SMC) which can cook your system (shortening its life) and/or wear out the fan units prematurely. I would recommend using a better app to monitor your thermal sensors (even log them) so you can see what your system is upto more effectively. I would give this one a try: Temperature Gauge Pro.

While you're inside it might be a good idea to clean & refresh the thermal paste on the CPU & GPU. as well as clean any dust build up on the heat sink fins and fan blades as well as the internals. Use can'ed air and a soft brush to scrub the dust free where needed.


The snap of your temps looks OK. You may need to stress the system a bit to see if the fan starts running rough. If you think it's the lower fan replace that one.

As to a guide to replace the thermal paste sadly there isn't one for your system. The steps are the same across all the systems. Follow the basic steps as outlined here: Technique: Applying Thermal Paste.

Here's the cleaner & paste you should use:


Corrected parts list:

  • CPU Fan 922-8459
  • Hard Drive Fan 922-8490
  • Optical Fan 922-8458

Dan, hope you don't mind me adding some images for a bit of a clarification for mamphp (see comments)

Block Image

Arctic Silver Thermal Paste Image


Arctic Silver Thermal Paste


Arctic Silver ArctiClean Image


Arctic Silver ArctiClean


Was this answer helpful?

Score 4


Thanx for your great answer, actually i couldn't find any howto to replace the thermal paste for my model. And the Fan , which make this noises is the first placed of LEFT-BOTTOM in iMac. the second one behind the hard is silence as always.



Thanx again, but if you look in imac 24 from mid 2007 is didn't have the same like in your link. and the noise is from the Fan even in lower rpm, seem a small piece is broken!!



Why u update and edit my own question???

What you listed above, that not correct, have nothing to do with this device i have.

Please if you help just help. don't remove part and edit my questions.


mamphp, what is is that "listed above, that not correct"? clarify this so we can change it. Your device is not a 2.4 GHz Core 2 Duo (T7700)

Intro Date: August 7, 2007 Disc Date: April 28, 2008

Order No: MA878LL Model No: A1225 (EMC 2134)

Subfamily: Mid-2007 - 24" Model ID: iMac7,1 ?????


Show 21 more comments

Add a comment

Add your answer

mamphp will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 1

Past 30 Days: 5

All Time: 1,304