Its not a fuse if this happens more than once. Fuses very seldom fix themselves. I say very seldom because they do on occasion corrode which can cause intermittant connection.

Try wiggling the ignition key when they don't work. Ignition switches often cause the A/C blower circuit to be intermittant.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician