where is the AC relay located on a 1991 Firebird

I'd go grab a Chilton or Haynes manual. It will tell you exactly where the AC relay is located and how to replace it.

I have the same question, we're is the a/c compressor relay located? Ur answer is to go buy a book? REALLY! That's the guru's answer?!!! If ppl wanted to go buy books ppl would have no need for You! And everything that go's along with the ability to ask the GURU's. Way a f co in joke! I'd add a pic of the relay but maybe u should do ur job!!!!