IMac Core2 system HDD failed yesterday . Today it works fine. Huh ?

My hard drive appeared to utterly fail yesterday . iMac could not find a system disk at all. White screen only.  Booted from DVD and ran utilities, then a "D" key startup diagnostic. , which reported a hard drive error - 1337.  it's still under Apple Care  (or another 2 months is all! )  but the nearest certified tech is 125 miles away and nearest Apple store > 500 miles.
Today, all is well.  Mac booted fine . No issues at all. Disk utility and techTool report no issues with volume.  S.M.A.R.T. Reporter is all green
I suspect this may be due to high ambient temperature in my work environment ( 80° F ) and possibly the iMac is clogged with dust from 3 years from running in what amounts to a garage studio. I installed a system temperature monitoring utility today but it indicates nothing unusual. The room is also much cooler today.  That's the only thing I can think of , other than an erratic drive about to fail for good.
But yesterday my iMac was dead.
*** is going on ?  Do hard drives refuse to run if they or the chassis around them are too hot ?
iMac 24" Core2Duo 3.06 ghz ; Leopard 10.5.8 ; 500 Gb Western Digital eSATA system disk

Before you do anything backup the computer using Time Machine and/or a bootable clone using SuperDuper or Carbon Copy Cloner. Drives can fail and magically come back to life, however this is just a temporary reprieve, it will fail again!
You should run Apple Hardware Test in Extended Mode, it may locate errors. If it does you can Google them or post them here.
You can remove the RAM cover at the bottom of the computer and vacuum out the dust bunnies that may have accumlated. Of course make sure the computer is turned off and all peripherals are disconnected.
Your ambient temp isn't very warm so that wasn't it however a dirty enviroment can be a reason for electronics failure. Dust will build up inside and block air flow, this makes the fan work harder trying to cool however all that does it pull in more air along with dust. If you are in a very dusty enviroment the best idea is to either clean it up or every few months to vacuum out the dust as described above.

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