THE ONLY THING WITH THE A/C IN THE MUSTANG IS THAT THE COMPRESSOR MIGHT FREEZ UP CAUSE OF THE BARRING IN IT SO U MAY HAVE TO GET A NEW COMPRESOR AND THE DRYIER WILL NEED TO BE RPLACE AND URS IS PROLLY R12 HOOK UP WHICH WILL NEED TO BE CONVERTED TO R134A WHICH COASTS LIKE 12 BUCKS SO ALL IN ALL...