Heat, Fan, and dimming display questions

I have a hot running MacBook Pro. I've had the unit returned for service and only one of my four issues was resolved. The unit is going back again for service.
I seemed to irritate the last tech support person by asking questions about the heat issues. Maybe some people here can help answer the question that changed his tone for the worse during the remainder of the support call.
Can you easily hear the fan(s) when they operate or do you have to put your ear real close to the laptop to hear the fan(s) operate?
I asked because I couldn't tell you what a fan sounds like on this machine. I'm on my second motherboard and I cannot feel any air flow from all those vents (or anywhere else for that matter) along the back of the laptop near the display hinge.
Has anyone found a correlation between a dimming display and heat? What happens is the display dims the equivelent of bringing down the brightness down three levels and after a few seconds it brightens back up.
The laptop is going in for a second repair for the following reason:
"Problem Description: Customer sensory issues - Temperature perception: CPU/Unit"
MacBook Pro   Mac OS X (10.4.6)  

Hello I just wanted to give you some insight on the screen dimming. If you have not unchecked the box at the bottom of the display pane is system prefs the display will dim when ever it scences a lower light situation. I have attached a picture. HERE
MBP 1.83ghz and iBook G3 700mhz   Mac OS X (10.4.6)  

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