Rear heat and ac question

[ryanmcb]

I am interested in buying a 88 suburban. My friend looked at it for me and said it has rear ac on the roof. There is a switch on the dash to activate it. My question is, will it also have rear heat in that unit? I don't know if that is a combo or could be just ac? If it has both, how do you activate the heater?

I hope someone can give some quick info on this. I need to act pretty fast.

Thanks
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