71 Dart A/C car heater issues

Ok I will try this.

Bought a new 180* thermostat... to replace the old 180* thermostat. No change. I’ll try and see if the blend door does anything.

also, when the time comes, how does this ac vent mount? Is there supposed to be clips under the dash for screws to go into? I can’t see how you’d get a nut and wrench on the back side of dash to tighten. Thanks a bunch you all have great info here!View attachment 1715516580

Sorry for hijacking this conversation. On the bottom side of the dash are two studs that hang down. This is what secures the A/C vents to the bottom of the dash.

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