its getting hot here in ma. tested the ac on a recent purchase,the vents blow cool air not cold,i noticed that the climate control is lacking proper functions,if i put it on auto the blower always runs,heat works great but no a/c,the small auxillary air pump behind the glove box works for the inner ambient temp,could it be a pressure sensor,should the a/c compressor clutch operate when i turn the temp dial all the way to 65? any help would be appreciated.