Technical Heater fan fuse

[digger58]

My heater fan fuse in a 2001 2.8 gets very hot when on setting 4.(When I looked yesterday I think it's fair to call it burned) This is fuse 13 (25Amp) which states in the handbook, Electric heater and Supplementary electric heater(Optional). The fan switch has settings 1,2,3 and instead of 4 there is a symbol like the windscreen. This BTW, is an air con unit. Is there by any chance and electric heater element built into the fan to speed up demisting? If so I will disconnect it so that the draw is less, then hopefully the fuse won't get so hot. The motor is free and bushings well oiled and the thermal fuse is intact on the resistor. Contacts on all the connections are clean, I had all that bother 2 yrs ago. The heat in the fuse has discoloured the fuse box cover. Surely this is not normal.? Any thoughts please?

 

[CDK]

The rating of a fuse is the current the fuse can carry indefinitely. If your fuse gets very hot it means there is approx. 25A flowing, which means a load of about 300W.
That cannot be just the fan, it draws 8 Amps at full speed.

So yes, there must be a heater element hidden somewhere, although the one in my Kia Sorento doesn't discolor the fuse box cover. Remove the fuse and measure the current with a multimeter. They usually have a 20A current range, if the display says overload there really flows more than 20A.

 

[digger58]

Thanks for that, anybody know where the heater element is on the ducato?