no heat or a/c
 

Hi folks,
New to the forum!
huge caddy fan, wanted one all my life (lived where you could not buy them) now have 2 ! 95 and 96.

My 95 the heat and a/c do not work, you can adjust the temp and speed but it makes zero difference to the output which is zero. one trip it had a draft of warm air but no force. I live in -20 plus winters so the car is off the road . The idle temp on the radio readout is 180 ish.
what you all think?
heater core?
heater motor?
Thermostat or other??