I just recently purchased a 87 with the automatic controler. When I got it the hot air was coming from the defrost vent and I could not change the temp or anything. This weekend after reading thru several forums I began replacing several vacuum lines. When I was finnished I had both control over the temp and vents. I had to pull the radio/ac control out to dissconnect a amp on an aftermarket radio that the previous owner had installed and when I was done I pushed it back in and now no vents again but I still have control of the temp. Any ideas as to what I might have done. I didnt unplug any thing execpt the connectors for the amp to the radio.

Any ideas as to where I should start looking and I dont know if this makes a difference but the comppressor is unpluged as it is not working.

 

i just recently bought my turbo model and it has the automatic controls, that would explain why it random put it on face and floor, but my compressor is unhooked tooand seems to work fine for me soo i dont think thats ur problem, check out z31performance.com forum they have alot more responses for this time of stuff

 

are you sure you didn't unplug a connector from the climate control? if it was working before and not after something you did caused that.