Mitsubishi — Draining the coolant and cleaning the cooling system
Maintenance
From a Mitsubishi owner's manual — check it applies to your exact model before use.
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Before you start
- Do not remove the radiator cap until the engine has cooled to room temperature.
- Coolant containing LLC is toxic; do not dispose of coolant into regular sewage.
Procedure
- When draining immediately after operation, let the engine idle at low idling speed for 5 to 6 minutes to lower coolant temperature to 70 to 80°C.
- Open the radiator cap.
- Place coolant receiving cans under the drain cocks on the engine, and open the drain cocks to drain the coolant.
- Close drain cocks and plugs.
- Pour in a cleaning solution (non-corrosive to rubber and metals) and operate the engine at 800 to 900 min-1 for about 15 minutes, then drain.
- Close drain cocks and plugs.
- Pour in fresh water and operate the engine at 800 to 900 min-1 for about 10 minutes; repeat rinsing until draining water is clear.
Tools required
- Coolant receiving cans Amazon
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
- Rinsing: 800 to 900 min-1 for about 10 minutes
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.