Yes you have to pull the heater control panel. Four screws and carefully pull forward. Looking at the levers the one that says off has a cable and a cam lever that actuates a switch. You may have to adjust it so it hits the switch. You will see what I mean when you look at it. Sometimes the cable gets a bend that prevents it from working correctly a little adjustment with a needle nose pliers will get you there.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184