Passenger side foot whell under the dashboard, easy acces just 2 screws for cover and two to hoals straps. Hoses are inside the engine compartment sticked through firewall underneat Hood hinge.
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Up and under the dash, in the center console.
Heater core most likely needs serviced (or replaced)
Heater core changed three years ago,I changed Thermostat Heater still blows cool air.
How do i change the window on a 95 chevy astro van
It may need a heater core.
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The heater core is located in the middle of the dash behind the center console. You have to take the console out to see the heater core.
I wouldn't think you could flush a heater core. you can flush a radiator. Heater core you would have to replace if it is leaking or stopped up
Starting the motor.
The hoses to the heater core can be disconnected under the hood. connect a water hose to the core, and try to flush the core to unclog it.