Disable Heat Death
To disable heat death (not exploding when you overheat) do the 
following. Take a mech that overheats by shuting down or 
explodes when perfoming an alpha strike. As soon as you do the 
alpha strike, quickly use your coolant by pressing the F key. 
You should recieve a message that says, "Heat death disabled." 

Easier Salvage
To salvage enemy mechs easier all you have to do is to shoot off 
one of the enemy mech's legs. An easy way to do this a group a 
lot of medium pulse lasers together and fire them at one leg. 
NOTE: This trick doesn't always work, but it does increase your 
chances for salvage. 

Video Select
To view any of the videos from Mech Warrior 3, open "My 
Computer". Then right-click on the Mech Warrior 3 CD, then click 
on open. Then go into the video folder. Just double click on the 
video you wish to view.