My 2006 iMac has begun to run hot which often causes issues.  How can I adjust the fan speed with supported software?

24-inch iMac (2006) funning hot.  Used "power button while turning on" trick to cool it so we could load some software which was telling us it was too hot;  it was also smellong like it was going to burn up on fire one day while running a slide show for an hour.  Need to figure out how to un-do the constant-on fan and need to find "supported" software that allows me to vary speed.

There is one called smcFanControl 2.2.2 released, but you really need to make sure that your iMac's air intake vents are clean and free from dust so that it is not sucked deeper into the iMac.
To clean the iMac's intake vent:
1. Shutdown the iMac and disconnect everything from it including the power cord.
2. Lay the iMac face down on a soft towel or cloth and go get out the vacumm cleaner.
3. Usinge the vacumm's brush or cravass tool, vigrously vacumm the bottom grill and small vent under the stand.
4. You also might want to remove the center RAM cover on the bottom and carefully vacumm it out without distrubing the RAM modules.
Then next before using smcFanControl, use the iStat Pro, a Dashboard Widget by iSlayer to first check all the sensor temp's and the speed of all three fans.
Finally if it is still having a cooling problem or you find that a fans has failed, you should stop using the iMac until the problem is fixed by an Authorized Apple Service Provider.

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