Water leaking from under dashboard

Possibilities:

. Condensation from the A/C evaporator coil, which is now overflowing--stick a long pipe cleaner up the drain tube.

. Antifreeze from a leaking heater core or control valve.

. Leaking windshield.

Leaking water from under the dashboard

Along the firewall, on the passenger's side.

Is the a/c drain line by the firewall on a 1993 gmc 1/2 ton turck?

Bravado 2000 water under dash board please hellp

No mechanic can find drain hose