One sure way to bleed air in a cooling system is to draw a vacuum in the cooling system until all hoses has collapsed. Then let the vacuum in the cooling sytem suck in the coolant.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked