Use of Recirculate feature depends on the car model
My ML manual does not say that this feature should only be used for 20 minutes. Also, I believe a certain amount of outside air does get into the system also; not sure of that. Again, in Dallas, I use that feature all the time on the ML to keep out the millions of pollen particles that are in the air most of time.
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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)
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