No heat 1985 f150 with no heat? pissed out rad fluid after turned off engine in cold weather

Thermostat is stuck open or heater core is stopped up try to flush out heater core with very little pressure 10-15 lps max

Sounds like the radiator line are plugged. What you can try is taking off one rad hose lin 1 Side at radiator and the other at the water pump to engine Run water through lines leaving both lines open should flush all debris away may have to do it a few times. Where this runs thorugh heater core and back out. But do not use alot of presure from the hose.