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!

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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