Originally Posted by
Glenn_
The heater motor should run even when its not switched on. Remove the panel under the wiper motor and check to see if there is any power going to the plug.
not on his car mate,it's going to be at least a 90 spec so you can turn them off
there is a microswitch that kills the power to it when both the sliders are set to the bottom position, check this one to make sure it's not stuck, it's behind the dash binnacle though so you need to get the screwdrivers out
once you've got the cover off you will see 3 screws holding the controllers in place, unscrew all these and you should be able to pull the unit out and access the switch
the other problems these had was the blower dial itself packing up
and then there's the wiggle test on the wires for the blower motor