Early 2009, 24" iMac: What are normal operating temps?

My iMac overheats and automatically shuts down frequently.  Sometimes, just watching a movie on Quicktime causes the CPU to top 80C and cause a shutdown.  Fans never run faster than 3500-3600rpm.
Another thing that I noticed, is that the hiutil process runs twice a day using 100% of my processor, and always causes an overheat and shurtdown.
Can anyone direct me to normal operating temps for this model iMac, or advise what may be worng?
This sreenshot displays temps (Celcius) with only Safari running.  With uTorrent running (not actually feeding peers), and Quicktime, I get an overheat.
TEMPS                                   FANS
HD Macintosh   54                Optical drive   801rpm
CPU                    55               Hard Drive      1599rpm
CPU Heatsink   51               CPU Fan          3580rpm
Ambient              39
CPU Diode        72
CPU Heatsink   60
HD Bay               54
Mem Controller  57
Processor  2.93 GHz Intel Core 2 Duo
Memory  4 GB 1067 MHz DDR3
Graphics  NVIDIA GeForce GT 120 256 MB
Running Mountain Lion 10.8.

Your temps are somewhat high, but still within acceptable levels.
I would be more comfortable seeing many of the temps in the 40 degree Celsius range.
Your CPU temps are on the high side and probably why your CPU fans are running high.
When was the last time you clear out any of the dust, lint and fine dirt particles from your iMac.
IF you've never done this, you need to completely unplug your iMac, find a heavy blanket or towel to lay your iMac, face down on the soft material. Using a special electronics vacuum, a portable, plug in vacuum or standardnhiuse vacuum with hose and attchments, using either the bare hose end or crvice tool, carefully and slowly vacuum all air intake and exhaust vents, openings and all of the ports to get rid of as much fine dust, dirt and lint as possible.
Do not use a vacuum attachment with brushes. This could cause a problem with random static charges.
Once this is done, re-setup your iMac, plug all your peripherals in and then do an SMC reset by plugging in your iMac to power. Wait 5 seconds, then power up your iMac.
Then report back here with any changes in temps.

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