Can you post a pic of your thermostat?
It should have 3 fan settings, Hi, Lo and Auto. It needs to Au first, then move the light down to Furnace.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package