That happened in my 1983 Mercury Villager and the problem was a blown circuit on the A/C circuit board. I soldered it and it worked. I found this solution online but I don't have the URL. Sorry. You have to remove the A/C unit from your dashboard and you'll find the circuit board there. The blown circuit will be near the corner of the board. Good luck!
I had the same problem, I went to the link below and clicked on topics. You'll find a detailed fix that costs nothing, worked perfect for me. Good luck. http://home.earthlink.net/~vqfaq/
Fuses or the power window relays.
Check wiring harnesses - prone to corrosion
Answer
You say the fuses are fine, i have just had the same problem. is your radio/headunit also not working??? And have you checked the fuses under the bonnet aswell as in the drivers footwell. I just replaced some of my fuses and it worked fine. Make sure your inginttion is off whilst removing/replacing fuses.(unless testing to see if it worked) Hope this helped!
The problem could be vaccum related. Check if the air vents in the dash still blow air. If not, it's possibly a vaccum problem
what about the fusiable links? if not u got a cut wire or bad conectin
Sounds stupid but I've been guilty of it....is the power knob pushed in & volume up?
check out the relay
Replace the headlight switch. Be sure to use a qualitypart.
My headlights are not working after going thru a car wash. Bulbs and fuses fine.
There are individuak fuses for each headlight
you might not have enough refregerant in the a/c system