Caterpillar C15 Industrial Engine — Cooling System Coolant (DEAC) - Change

Maintenance

For the Caterpillar C15 Industrial Engine, from the Caterpillar owner's manual.

Applies to: Caterpillar C1.5 engine

Procedure

1. Drain: stop engine, allow to cool, loosen filler cap slowly, remove cap, open drain valve or remove drain plugs, allow coolant to drain.
2. Flush: flush with clean water to remove debris; close drain valve, clean and install drain plugs.
3. Fill with mixture of clean water and Caterpillar Fast Acting Cooling System Cleaner; add .5 L cleaner per 15 L capacity; install filler cap.
4. Start engine and run at low idle for minimum 30 minutes. Coolant temperature should be at least 82 °C (180 °F).
5. Stop engine, cool, remove cap, open drain valve or remove drain plugs, allow water to drain; flush with clean water; close drain, clean and install plugs.
6. For heavy deposits: use .5 L cleaner per 3.8 to 7.6 L capacity; run low idle minimum 90 minutes.
7. Fill: fill with coolant/antifreeze; refer to Refill Capacities and Recommendations.
8. Start engine, run at low idle, increase to high idle for one minute to purge air; stop engine; add coolant to full.
9. Clean filler cap, inspect gasket, pressure test with 9S-8140 Pressurizing Pump; replace cap if needed.
10. With coolant recovery tank: fill recovery tank to 'COLD FULL' mark; install cap; start engine and inspect for leaks.

Source: Caterpillar 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.

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