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Cooling System Bleeding Cadillac DeVille Concours I final

Mechanical ~144 words
  1. After servicing cooling system, use this procedure to ensure all air has been bled from system. If system was drained, disconnect lower radiator hose, place 3 pellets of GM Coolant Supplement (3634621) into lower radiator hose, then reconnect hose.
  2. Add a 50/50 mixture of coolant to surge tank until system (including surge tank) is full. Start engine. Set climate control to any mode except MAX. Set temperature to highest setting.
  3. Run engine at idle until lower radiator hose is hot. Add coolant to surge tank until tank is full. Install surge tank cap (align arrows on cap with overflow hose). Allow engine to cool. Fill overflow reservoir to FULL COLD mark.

Note. The preferred method is to remove the powertrain assembly out bottom of vehicle. If necessary equipment is not available, use alternate removal procedure, removing engine out top of vehicle.

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