Mitsubishi — Draining and changing coolant
Maintenance · Cooling system
From a Mitsubishi operator's manual — check it applies to your exact model before use.
Applies to: Mitsubishi S16R-Y1PTA-2 engine
Before you start
- Remove the radiator cap only after the engine is cooled to room temperature.
- Coolant containing LLC is toxic; never dispose of it into regular sewage.
Procedure
- When draining immediately after operation, idle at low idling speed for 5 to 6 minutes to lower coolant temperature to 70 to 80 deg C.
- Open the radiator cap.
- Place coolant receiving cans under the drain cocks on the engine and water pump, and open the drain cocks.
- Close drain cocks and plugs.
- Pour non-corrosive cleaning solution into the cooling system, operate at 800 to 900 min-1 for about 15 minutes, then drain.
- Pour fresh water, operate at 800 to 900 min-1 for about 10 minutes, and repeat rinsing until draining water is clean.
- Pour in undiluted LLC, then water slowly to the full level, and close the radiator cap securely.
- Shut off fuel and crank the engine about 10 seconds; wait about 1 minute and repeat to remove air from the water pump.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Cleaning solution circulation: 800 to 900 min-1 for about 15 minutes
- Fresh water rinse: 800 to 900 min-1 for about 10 minutes
Source: Mitsubishi operator'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.