1973 Dodge Dart Sport No Heat.

There are 2 vacuum pods under the dash, they need to be functioning. One is next to the vent pass side. The other is on the top middle. Two nuts hold the A/C vents, yes, doesn't give you much and with the glove compartment out, you can see most of it. If you end up removing the heater box or A/C box, you might as well get the kits from DETROIT MUSCLE and rebuild them, they probably need it, mine did.