It's necessary if you want the ac to work, if not they it would be ok if you disconnected the electrical to it. The reason is that every time you turn on defrosters the ac would kick compressor in. Other wise it would freeze up and fry the alternator belt.
August, 9, 2012 AT 11:08 PM
What liter engine? You can find a belt w/o an AC or dummy pulley in place of the compressor