Last winter, when doing routine maint, I had the blower and hoses out of the car. Not much weight at all. Now, all the a/c crap...that *is* another story. If you don't live in a hot climate, you can *hit-can the whole system to the tune of 75 lbs.
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'81 SC Coupe (aka: "Blue Bomber")
Canada West Region PCA
The Blue Bomber's Website