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Q: the heater/ac blower doesn't work anymore I am a sr citizen & need s free help on 1991 Mercedes-Benz 420SEL

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I probably need to replace the defroster and htr/ac blower as it desn't work on any switch setting...the fuse is OK ...where is it located so I can replace it...Thanks PS..( I'm celebrating my 88th birthday today ) ....
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