I WAS PULLING OUT FROM A STOP WHEN I GOT BLASTED IN THE FACE OUT OF AIR CONDITIONER VENTILATION WITH SOMETHING THAT MADE ME GO BLIND HYPERVENTILATE HAVE SEVER MUSCLE CRAMPS ARMS AND LEGS WENT NUMB. THE AIR IN THE TRUCK WAS TESTED AND IT WAS ISOBUTANE, BUTANE, 2-METHYL BUTANE,PENTANE,TOLUENE, ETHYLBENZENE AND XYLENES BLOWING THROUGHOUT MY TRUCK!!!!