Sometimes a/c works some times it blows warm air. Trucks a 1999 bravada.

Does it blow cool for a few seconds then get warm?

yes

Sometimes a/c works some times it blows warm air. Trucks a 1999 bravada.

I had a wife like that one time.:grinyes:

We need a little more info on it.
Auto matic or manual controls.
Any lights flashing?
Does the AC compressor run all time or just come on and go off and stay off or cycle real fast?

MT