Re: Blower on '89 Ciera 2150
I have an 88 1950 and they appear to have the same blocky vent box. I can't say for sure what size the hose is, I can try to measure it when I get home.
You could always go with a generic 4" inline blower and then reduce it down at the output if you need to. I picked up some Jet brand 4"-3" reducers at my local woodworking store for my dust collection system for just a couple of bucks. If all else fails that and some basic hardware, a short section of 4" hose, a couple of clamps and maybe some duct tape and a few minutes should get something together.