1993 GMC Suburban Owner's Manual - Page 148

K2190 Yourvehicle'sflow-throughventilationsystemsuppliesoutsideairto of your vehiclewhen it is moving.Withthesidewindowsclosed,air intothefrontairinletgrilles,throughthevehicleandouttherearairexhaust valves.Outsideair will alsoenterthevehiclewhentheheaterortheair conditioningfan is running. the inside will flow ventmton Tips 0 Keepthehoodandfrontairinletfree of ice,snow,oranyother obstruction(suchasleaves).Theheateranddefrosterwillworkfar better,reducingthechance offoggingtheinsideofyourwindows. Whenyouenteravehicle in cold weather,' turn the blower fan to HI for afewmomentsbeforedriving off. Thishelpscleartheintakeducts of snowandmoisture,andreducesthechanceoffoggingtheinsideof your windows. 8 Keeptheair path underthefrontseatsclearofobjects.Thishelpsair to circulate throughout your vehicle. Your vehicle's flow-through ventilation system supplies outside air to the inside of yourvehiclewhen it is moving.Withthesidewindowsclosed,air will flow intothefrontairinletgrilles,throughthevehicle and outtherearairexhaust valves.Outsideairwillalsoenterthevehiclewhen the heateror the air conditioningfanisrunning. 3-2