my a/c and heat is not workin at all..when i turn on the heat or a/c it does not respond... everything lights up its just not responding i do not kno how to go about diagnosing the problem so any help would be appreciated...

 

What year and trim? does the blower blow air out of the vents? do the controls light up?

 

I start by checking the fuse under the dash for the blower motor.