I'm not exactly if this is an A/C problem, but ever since I replaced the spark plugs and wires on my car, I turn on the A/C and air won't come through the main vents it all comes through the defrost vents. I tried turning the **** to different settings, but I still get the same result on every setting. I tried it with the heater, and I get the same effect. Has this happend to anyone before? How can I fix this? Thank you for your time.

 

It's most likely a broken vacuum line, look around the right side of the engine compartment for a broken line. Also, there is a vacuum valve that is known to go bad, it is in the same area, right side of engine compartment around the AC box. HTH

 

would there be a hissing sound coming from that general area? And by right side of engine compartment, do you mean passenger side?

 

Yep, same thing happened to me....

 

awesome! That really sums it up lol....once my car comes back to life I'll check that out asap!! Thanks guys!