In Dallas, Texas -- I need the cooling air most of the time. I may have used the "heater" in my ML a couple of times in several years. I also like to filter the air here because of the pollen and other stuff in the surrounding atmosphere, so I normally have the dial on Blue/Cool and the fan on 2 or 3 -- sometimes using the Recirculating setting when I want to cool it down really fast after starting on a 100 degree day. My 68 230S does not have a/c, so the heat is all that can be used and my 89 and 92 Mercs have the dial up settings for climate control ... again, a little different in the hot, hot climate of Texas and other parts of the southern U.S.

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)