1986 bmw 528(e); m20; 56,000 miles
- I have been noticing that the auxiliary fan (blue ceramic) fuse (25A)
is somewhat melting...but the fuse is not blown -just very discolored.
I just put in a new one. The end points that hold the fuse is not that
secure as a result of the melting. Should I decrease the Amp a size
down? What risk to the entire fuse box?
- Check that the fan is working well and not being restricted in any way
which may increase it's load. sometimes worn bearings cause this. Don't
decrease the fuse rating. The fan is only designed to come on at high
temperature or when the aircon is switched on. Check that it is not
coming on all the time regardless.
The heat is generated by resistance at the contacts.
Heat is proportional to
the current squared times the resistance, so for high
current circuits like
a fan, its key to avoid resistance. Clean out the old
plastic and emery
cloth (lightly sand) the contacts.
If the contacts are loose (are they floppy loose, or
just bent away from the
correct position?), that needs to be fixed. The
contacts need to press
against the fuse contacts. You can make a temporary
fix using a rubber band,
but that will fail over time as the rubber gets old.
You can probably remove
the fuse box cover - after disconnecting ground at the
battery, and see if
the contacts for the fuse just warped from the heat or
need to be replaced.
Ypu may be able to bend themback without removing the
cover, it'll depend on
your tools, access and skill level. Be careful bending
them too much as the
bending causes the metal to "work harden" i.e. get
brittle, and after a
couple cycles, it'll break.
Waterloo, Ontario Canada, eh
94 855 turbo
85 535 (sold)
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- Cleaned cotnacts of fuse. No luck. Fan bearings I am told is okay.
Does anyone have any ideas on how to reconfigure the auxiliary fan fuse
so that it is housed separately and is independent of the fuse box?