What's It Worth? Rear A/C setup in 89 burb

[Old Chevy Lover]

I just got an 89 Suburban that is pretty much ragged out. I'm just planning on using it to pull a dirt track car to a local track and was thinking of selling some of the parts off of it that I don't need. One is the rear A/C unit. It is still hooked up with the switch on the dash (seems to run when switch to 'hi' but not 'low'). The A/C stuff is missing under the hood. I was just wondering what the setup would be worth?