Isuzu — Filling with Coolant

A Isuzu service procedure — check it applies to your exact model before use.

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Procedure

1. Close or tighten the coolant drain plug.
2. Use clean drinking water as a coolant. Fill up the radiator with the coolant until the level comes up to the filler port neck. Fill gradually to prevent air entry.
3. With the coolant poured, operate the engine about five minutes at a low idle speed, then the air contained in the coolant circuit is bled. The coolant level will drop.
4. Stop the engine to replenish with the coolant.

Source: manual:isuzu_4le2_opm.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.