I change the thermostat yesterday at -15C/5F. I needed hot air in the cabin....
Before I get a good manual so I don't have to aks you guys these rookie question.
How do I purge air in the 1981 300sd cooling system?
It is still very cold out there today -20C/-3F. Fast and organize intervention is the only way to go!

__________________
Yves

1981 300sd 122km
1987 Crown Victoria 230km
1971 Karman Ghia (need engine)
2003 Gas Gas 280pro trial
1974 Yamaha TY175 trail
1974 Elan 300SS

is to start the car and bring it to op temp so that the stat opens. then add water as the air is distributed. and repeat a couple times more.

brian suggests removing the upper rad hose and filling from there. this is not as convenient but should speed the process up.

tom w

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.