OK, a little more detail.
The push pull knob works full and freely and moves the crank on the heater box, but does this just control air direction or actually regulate the amount of heat?
The rocker switch does indeed work ( see below)
And yes there are air vents in the footwell that do allow a dribble of hot air into the cabin the the car is moving.
A quick check shows the fuse (fuse15) has blown. Replace the fuse and still no blower but the wires get warm and the ignition light dims. Remove the heater motor and replace with a test bulb and the switch is indeed working correctly.
Conclusion. Motor may have seized causing th fuse to blow.
Question. How do I remove the blower motor?
Initial question still remains, what does the push/pull knob do?
Thanks for the replies.
Gary.
