Fuse inside fan blower rheostat in 328

The fuse for the rheostat in my driver's side vent blower seems to be blown. I went to Radio Shack to replace it, and the one that was in there translated in the computer to .375 amps...when I put the new one in, it also blew (at least I think it did, as it is so fine, it's almost impossible to see.)

Anyone know what the rating is for that fuse? It is not listed in any of the manuals. (And I haven't pulled the other side apart to look at it.)

Thanks.

 

I put it all back together, so I'll take a picture the next time I have it apart.

If you pull the rheostat, there's a little knob on the right hand side. That knob is a holder for an onboard fuse.