Kohler — Flush Cooling System
Maintenance
From a Kohler owner's manual covering: LH640, LH685, LH685/LH690, LH690. Check it applies to your exact model before use.
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Procedure
- Fill cooling system with clean water and a cooling system cleaner recommended for aluminum engines. Follow directions on container.
- Reinstall and tighten radiator cap.
- Start and run engine for five minutes, or until it reaches operating temperature. Stop engine and allow it to cool.
- Drain cooling system.
- Fill cooling system.
Source: Kohler 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.