1993 GMC Suburban Owner's Manual - Page 155

1 ... . K2172 I youhavearearheater(withoutrearairconditioning),thecontrolswitch f is locatedontheinstrumentpanel. To increaseanddecreasetheftowofheated air to the rear floor vents, move the switch with the fan symbol on it to the blowerspeedyouwant. Movetheswitchalltheway to the left position to 'turn the rear blower off, andeachpositiontotherightincreasestheflowofheatedair. Move the switch all the way to. the right position to-turn the blower on high, providing .maximum flow of heated air. 3-9