Mitsubishi S12A2 — Drain and flush the cooling system
Maintenance
For the Mitsubishi S12A2, from the Mitsubishi owner's manual.
Applies to: Mitsubishi S12A2, Mitsubishi S12A2 engine
Before you start
- Antifreeze contains alkali; avoid contact with skin and eyes
- Dispose of drained coolant according to local regulations
Procedure
- Start the engine and operate until coolant temperature reaches 70 to 80 deg C.
- Allow engine to cool to room temperature, relieve pressure, then remove the radiator cap.
- Loosen the engine and water pump drain plugs and remove radiator drain plug; drain coolant.
- Remove air cooler pipe drain plugs (one each side) and drain coolant.
- Close drain plugs, fill with cleaning solution and operate at 800 to 900 rpm about 15 minutes; drain.
- Fill with clean water and operate at 800 to 900 rpm about 10 minutes; repeat until draining water is clear.
Specs & values
- Wash cycle at 800 to 900 rpm for about 15 minutes
- Rinse cycle at 800 to 900 rpm for about 10 minutes
Full service-parts list: Mitsubishi S12A2 →
Source: Mitsubishi owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.