Stop in for a cup of coffee

Well I better get into the shop, had the heat on all night so I could at least be temp comfortable as I replace this core. One thing I don't know, there's an aw **** bolt low and between fender well and firewall, know it's on the 88 and before but not sure if it's on the 89 and above. I guess I'll know when I try to pull the box and it doesn't come out!