1994 Pontiac Firebird Owner's Manual - Page 108

NOTICE: Don't use a razor blade or something else sharp on the inside of the rear window. If you do, you could cut or damage the warming grid, and the repairs wouldn't be covered by your warranty. I - I Rear Window Defogger (OPTION) The rear window defogger uses a warming gridto remove fog from the rear window. Press the switch to turn on the defogger. An indicator light will come on to remind you that the defogger on. The defogger is will turn off automatically after about ten minutes of use. If you turn it on again, the defogger will operate for about five minutes only. You can also turn the defogger off by pressing the switchagain. Do not attach anythinglike a temporary vehicle license or a decal across the defogger gridon the rear window. :low-Through Ventilation ;ystem 'our Pontiac's flow-through ventilation ystem supplies outside air into the ehicle when it is moving. Outside air fill also enter the, vehicle when the heater r the air conditioning fan is running. 107. I I .