any tool or hardware store should have a battery charger if not harborfreight.com sells them too. charge it first and make sure theres nothing draining it when its off. seat control modules are notorious for draining the battery. the vent problem is likely one of more stepper motors is defective. the left footwell motor is a common problem on your model. not so much the motor but the link behind it. cheap part but labor intensive to get to it.

the C320 takes 7.9 quarts, the C240 takes 7.4 quarts and the C230 takes 5.8quarts. Synthetic only!!!

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

so yea.. i recharged my battery and i could start my car. now i need to take my car to the dealer, and get checked thank you everyone.