Cadillac Repair: 86 fleetwood brougham. Heat control, fleetwood brougham, heat control

Question
86 Fleetwood brougham. My heat works but only at the floor. And the "Low-High" speed control does not work It only works for one speed. The temperature works from 90 down to 60, It just wont switch to the vents or defrost. Help I do not know where to start my trouble shooting.

Answer
You either have a fault of the heater/AC programmer and or a faulty vacuum door.

If you are mechanicaly inclined or know of someone who is, You will need a DIGITAL MULTIMETER, Simple electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture. I do not have a website so you will have to e-mail: onlineautohelp@msn.com in order to obtain the information.