I have 99 s420 and yesterday coming from a trip to San Diego from LA, suddenly my AC blew a whiff of sulfur into the cabin. It was pretty potent, kind of like Chem 101 S2 stuff. It happened twice yesterday. Once in afternoon and another at night. My ac was on LO both sides and I was at 3 lines of fan. It was not the first time it happened either. I have 45000 miles. Plus once I changed my antifreeze at the dealer this year, they only used one bottle for it. Usually I am running at 100c but before I was 80. Is one bottle good enough. Please post if you can help me out.