How to revert back to Lion from Mt. Lion

I have a 2009 IMac.  I have no problem upgrade from Lion to Mt. Lion.  The only issue I have is the IMAC is very very warm, 55 degree on CPU and between 65 to 70 on GPU diod.  I want to revert back to Lion which I paid and downloaded in 2011.  The App store would not let me redownload again said that I have a newer system. Since I downloaded the Lion, I do not have any installation disk for Lion.

You need to first erase the hard drive:
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your startup volume (usually Macintosh HD) from the left side list. Click on the Erase tab in the DU main window.
Set the format type to Mac OS Extended (Journaled.) Click on the Erase button and wait until the process has completed.
Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

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