The fan on my macbook will not turn off

Please help.  the fan on my macbook will not turn off.  Also, my battery is no longer showing a percentage.
Thanks

Hmmm.  You have done the basics.  If you open the ActivityMonitor app in the Utliities folder,  select CPU usuage in the column-  flip it so highest % is on top.  Is ther an app in that column that is spiked?  Quit that app.
You can run the Apple Hardware Test by booting holding the D key on restart,  this may generate an error code. Not the most complete test but it is a start.
If no AHT- Boot off your Install Disk while holding down the d key, (not c key), then run the extended Apple Hardware Test. Some disks require you to use the Option key at bootup to select AHT. Some models have a separate AHT CD.

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