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You may need a thermostat and a coolant flush but one thing you can try first is disconnecting the heater hoses and run a garden hose with low pressure through the heater core both directions.These are commonly known to get plugged heater cores. If flushing the heater core out brings your heat back definitely get a coolant flush. Make sure to dispose of any antfreeze properly.
the idea of the switch is run on vacuum and is not making contact with the switch it self either worn contacts in the switch itself **** as an obstruction as well or the vent door is stuck in just that position either behind the glove box or the ash tray are the vacuum lines one of them may be pinched off or the door needs a bit of help until you can free it up
the right hand side of the dash underneath you will find a box with water hoses attached that will be the heater core, possibly look under the hood on the pass side and see if you can get to it there . probably not though. it will be difficult. go to pep boys and pick up manual for your model of vehicle will show everthing.