Your iMac has a thermo cut off circuit so when it gets to hot it will shut down.
You can try using some compressed air to blow out the vent areas hopefully dislodging the dust build up that could be causing your system to over heat.
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More likely one of the fans is not working. You can try running a application to monitor your temperature and fan sensors to see which area is suspect [https://itunes.apple.com/us/app/temperature-gauge/id467830521?mt=12|Temperature Gauge].
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More likely one of the fans is not working. You can try running an application to monitor your temperature and fan sensors to see which area is suspect [https://itunes.apple.com/us/app/temperature-gauge/id467830521?mt=12|Temperature Gauge].
Depending on your skill set you could try replacing the defective fan or bring your system into an Apple Store and have them fix it. Sorry to say there isn't a fan replacement guide. Here's the guide to pull the display unit so you can access the fans [guide|9025|iMac EMC 2267] Its also possible you just have a lot to dust build up inside as well.
Your iMac has a thermo cut off circuit so when it gets to hot it will shut down.
You can try using some compressed air to blow out the vent areas hopefully dislodging the dust build up that could be causing your system to over heat.
More likely one of the fans is not working. You can try running a application to monitor your temperature and fan sensors to see which area is suspect [https://itunes.apple.com/us/app/temperature-gauge/id467830521?mt=12|Temperature Gauge].
Depending on your skill set you could try replacing the defective fan or bring your system into an Apple Store and have them fix it. Sorry to say there isn't a fan replacement guide. Here's the guide to pull the display unit so you can access the fans [guide|9025|iMac EMC 2267] Its also possible you just have a lot to dust build up inside as well.