I have a 71 Camaro - with factory air. After I turn the key off the i hear the fan motor turning for awhile. I must have a drain, because my battery is dead aftesr sitting awhile. Not all my fan speeds work either. Any suggestions?

Fix/replace the resistor pack for the fan control. GM apparently "designed" the run-on fan bit to ensure continuous ventilation- but every vehicle I've ever encountered that had the run-on every time the car was turned off ended up having problems- like discharging batteries and/or defunct resistor packs or control boards (in newer vehicles).

I disconnected mine at the controlhead. No more astroventallation.
I have OFF,LOW,MED,HIGH now and OFF really is OFF

Eric, Thanks for the info - but where do I find the resistor pack for the control board - is it on the evaporator case. Where would I find a replacement. Thanks.

It's in the heater box by the evaporator- the thing with the 4-wire harness attached to it- pull it out and you can't miss what it is- it has coils of rigid wire underneath the cable plug. I can't speak for the availability of a '71 unit- but GM tended to use the same part in almost every vehicle they made (only difference was A/C vs. No A/C) for years- so it may be something GM still carries or that you can get from a corner auto supply store. It's GM part/assembly number in 1970 was 3929052 in a non-A/C car- but I don't have a reference for an A/C-equipped unit.