number 5 fuse controls your ccu, aspirator blower motor,aux coolant pump,switchover valve for the climate control,A/C compressor control unit,starter lockout and backup light switch,aux fan pre resistor relay.
If I was a betting man, I would pick the aux coolant pump first. i bet it is seized.Unplug it, put in a new fuse and try it again.
John
The reason that the air is coming out the defrost only when the fuse blow is because that is the default setting for the CCU
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John
1986 300sdl
1985 380se
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