10.4.9 and fan noise

After using software update to install 10.4.9 I'm having a problem with the fan running noisily and constantly. Mdimport appears to be the problem. It runs most of the time and consumes between 55 and 60% of cpu. I initially assumed that the install prompted spotlight to re-index the hard drives (the mac's and an external drive). It's been doing it for 3 days now. Is there any way to stop mdimport - or apply another cure?
iMac G5 2 GHz   Mac OS X (10.4.9)  

I too have upgraded with all relevant updates to 10.4.9 with the result that the fans come up to full speed (although not constantly). Using Activity Monitor utility I also find that mdimport (whatever that is) is using between 22% and 60% of the CPU, SystemUIServer 2-4% and Activity Monitor itself uses 2-4%.
The only application running is Safari, but it's the same with just Mail or even just moving files around within finder!
What concerns me is what will happen when I start to use more hungry apps like Final Cut Express HD or Photoshop.
Anyone know why? Is Tiger doing something else that makes the CPU hotter than with Panther? What is mdimport and can it be switched off?
Reading through other threads it seems many people are having this problem, I have always done system maintenance regularly, and all hardware is fine, or at least it was this morning when it was running Panther. I don't think we could all be unlucky enough to have hardware go down just as we upgraded to Tiger. So it must be system/software related.
Actually while I am writing this I can here hard drive activity... something is writing something somewhere.

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