2011S550w221

Hi all
need some advise

AC blower wants to blow intermittently
the diagram doesn't list the blower fuse or relay

there the fuse box on the driver side in the engine compartment

i shook the relays

no change

If It's the blower motor under passenger dash then I can replace but wanting some advice
thx

2011 S550 base NOT 4 matic

BOTUS

have a search - must be posts - likely crap build up below the battery under the bonnet has allowed water to flood the blower motor
its a normal Mercedes trick

2011S550w221

In the engine compartment where battery is?
or
under the passenger dash?

BOTUS

under the bonnet pull out the battery - remove its mounting bracket - 2 bolts - clean the gunk up, unblock the plastic gutter pipe from edge of the screen running in to the inner wing
then pull back the carpet inside and sort the corrosion mess and puddle - then look up at the blower motor and sort that
the module to control the AC sits beside the fan - the side away from the inner wing - I believe its the connection or brushes sitting on top of the fan that cause the fan to give up - on most Mercs its at the top of the fan ready to get wet

2011S550w221

Thanks
I call the bonnet the hood
lol

S550TK

Sometimes my blower motor turned on and sometimes it didn't. I replaced the blower motor and that fixed the issue for me.