<<do you know what the values of the heater blower resistors are in ohms
<<and wattage. My thinking is that if the fuse does not blow ( and mine
<<did not) the wattage value of these must be way too small.
The values are printed on them usually, .02 ohms, and .04, the power
dissipation value is somewhere around 100Watts. The fuse in the fuse block
is sized so that it will protect the wiring, and not blow when the fan is
run on high speed. The resistor will always get hot, and are designed for
this. It is mounted in side the air ducting, so that it gets forced air
cooling. When the fan motor bearings start to get too much friction, the
resistor will get hot enough to damage the plastic or worst case start a
fire. In this case the thermal fuse on the resistor pack will melt open.
Your resistor is not burned open the thermal fuse is. Unfortunately the
fuse is not replaceable, and the resistor assembly needs to be replaced, as
well as the blower motor. You may be able to oil the motor shaft and work
it into the bearings. If the bearings have started to gall then oiling will
not help, and the new resistor will eventually blow open too. In short if
everything is working properly the resistors are sized properly.
