MBP - Intel Core 2 Duo (2008) - Scalding hot, Fans at 6000rpm

Hi all,
I've been searching for months now for an answer to this dilemma, but I can't seem to find anything that's fixed the problem. I would love to avoid bringing this thing in if possible.
My specs: MBP Intel Core-2 Duo 2.33mHz, 3GB RAM, running OSX 10.7.5 - This thing has been with me for a while and has really stood the test of time thus far.
For the past few years, this thing has just run scalding hot temperatures (around 135-140 F), with fan speeds usually up at about 6000rpms. So it's super hot, super loud - with, according to my sytem monitor, only 5-8% of the CPU resources being used. All it takes is a single application, be it a web browser or anything that even engages the CPU to get it up to those levels. Closing everything rarely leads to it cooling off and quieting down.
I'm fully up-to-date with firmware. I recently swapped the HD to a 500GB seagate and thought that had solved the problem, but it started back up a few days later.
Could this be a heat sink problem?
Literally ANY help would be so tremendously appreciated.
Thanks so much!

Well, it's possible there is a hardware problem such as a loose or disconnected temperature sensor. You may wish to try running the hardware diagnostics to see if they provide any useful information:
Using Apple Hardware Test
Intel-based Macs- Using Apple Hardware Test
Intel-based Macs- Starting up into Apple Hardware Test
If nothing pops up then take it in for service. Do not continue to use it with this problem present or you may damage it further.

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    greetings

    I have mixed feelings on that subject.  The downside is more wear and tear on the fans and lower battery life. The upside is that, and perhaps more important, it does dissipate more heat.
    I simply take the position that the Apple engineers know what they are dealing with and have designed the cooling system such that additional modifications are not necessary.  However I have on occasions placed my MBP on large aluminum plates to act as large heat sinks when using the MBP for lengthy periods of time where much heat is generated, such as watching video.
    General rule:  If you can keep it cooler, so much the better.
    Ciao.

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