alan_m wrote on 06/06/2019 :
Has it overheated because the connections to the spade terminals were not
perfect?

The wire is soldered onto the terminals with no sign of overheating
there. The fan casing had become discoloured and brittle, the end of
the actuator opposite the piston/plunger had actually burst away. It
has quite a strong spring built into the actuator, to return it once it
has cooled.


Was it actually overheating or just discoloured due to it being used in a
damp environment and dust in the atmosphere has just stuck to the casing over
the years that it has been in use.