On 09/03/2020 21:43, John_j wrote:

But will melt before the thermal fuse blows.

tin/lead solder will melt at 370C
The thermal fuse will be 150C to 200C lower.

In normal use fuse will blow long before the solder melts. If the
solder melts in normal use you will have a greater problem than a blower
motor fault!

I've used a high power soldering iron to solder to the leads of thermal
fuses without the problem of the fuse blowing. As other have said you
can heat shunt the body of the fuse to prevent the body of it getting
too hot but in my experience a 10 second application of a soldering iron
to the fuse lead doesn't result in the body of the fuse getting too hot.
There may be a problem of using a low power soldering iron that has to
be left on the solder joint far too long. Clean up old wires and tin
with fresh solder before making the joint.

https://www.youtube.com/watch?v=8jUaf394WIk



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