So, should a pilot pass-out when his Mech is overheating too much for an extended period of time?
The way I see how this could be implemented, is simply that the viewport of the pilot would narrow (i.e. edges of the screen would blur up and darken). It wouldn't go totally black, the center would remain somewhat visible, but be very blurry. The effect would only last until the heat has dissipated and that the cockpit's ambient temperature is back to normal.
Alternatively, a pilot suffering from too much heat for too long would simply die in the cockpit.
You have to remember that MechWarrior pilots were often wearing nothing else than their underwear in the their cockpit because of the heat, and that the human body is very susceptible to heat damage.
Edited by Tweaks, 04 November 2011 - 08:03 AM.