2017 Caterpillar 279D Track Skid Steer

2-Speed, Hydraulic Quick Attach, CAT 86" Bucket, Aux. Hydraulics, 17.5" Wide Rubber Tracks, Enclosed Cab with Heat, A/C, and Windshield Wiper, Air Ride Heated Seat, A/C Not Working (no belt ran to A/C Compressor), Code to Start is 3670 and Have to Hit Glow Plug Button While Turning Key, Issue with 2-Speed (shifts and rabbit comes on screen but drives the same speed) Runs and Operates but 2-Speed Not Working