i have a 300td and its climate control doesn't work when running. it works when the key is turned to the last position but not started. when i looked at the fuse designation and it also shows some idle valve and was wondering if that's for cold starting. i looked at the box and it has a little burn mark on the paper above the fuse, but the fuse is fine. so i wanted get some other opinions before i replace the whole box. or if there are any relays that are associated with the 8th fuse or climate control. thanks

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1974 240d
1983 240d -sold
1989 420sel with om606
1994 s350 turbodiesel - sold