Broken heater
I'm looking for tips for troubleshooting the heater in my 1970 IIA. It's a Smith heater and when I try to switch it on nothing happens. I need to start with the basics - first how is this heater supposed to operate? There's a switch on the dash, a pull out knob next to it, and another knob on the long rectangular box below the dash - that one slides left-right.
Do I need to do something other than flip the switch to make this thing work? And if not, what should I check first?
Thanks
1970 Series IIA
1964 Series IIA [sold]