Sorry, i have a 95 325i, so i cant help you with the climate control topic. Its easy to check the cluster for loose connections, 2 screws at the top, unscrew them, pry it out, if all connections are solid then it could be a bulb (or bad internal connection), in that case you'll have to unplug the cluster, pull it out and check the bulbs in the back. As for the traction control light, he could've done the ASC delete. And are you sure its the abs light? or is it the brake pad wear sensor light?
1995 325i - Sold
1997 540i/6 - Wrecked
1998 328is M/pkg, Born and raised in Germany - Sold to a Max member
2000 540i/6 - Sold