New Holland T9 Tractor Engine Coolant Drain and Flush Guide

This guide explains how to drain and flush the engine coolant on a New Holland T9 Series tractor, ensuring your cooling system stays in top condition.

Coolant Drain and Flush Procedure

1. Park and Prepare

Park the tractor on a level surface.
Turn off the engine.
Remove the key from the ignition switch.

2. Release Cooling System Pressure

Once the engine has fully cooled, carefully loosen the deaeration tank cap (1) to the first notch to release system pressure.

NOTICE:
The cooling system pressure cap includes a control valve that functions as a safety relief valve, maintaining system pressure.
Never run the engine without the pressure cap in place — doing so can cause system damage.

3. Drain the Coolant

Open the radiator drain valve (2).
Collect the drained coolant in a suitable container for safe disposal.

4. Add Radiator Cleaner

Fully remove the deaeration tank cap (1).
Pour in a commercial-grade radiator cleaner.
Fill the system with clean water.

NOTICE:
Always follow the product instructions and ensure the cleaner is compatible with aluminum radiators.

5. Flush the System

Drain out the radiator cleaner solution.
Flush the entire system thoroughly with clean water, following the cleaner manufacturer’s directions.

6. Inspect Cooling System Components

Check all hoses, fittings, and heater hoses for:
- Cracks or wear
- Loose connections
- Signs of leaks

7. Refill with Coolant

Fill the cooling system with a 50/50 mixture of:
- AMBRA ACTIFULL™ OT EXTENDED LIFE COOLANT or
  AKCELA ACTIFULL™ OT EXTENDED LIFE COOLANT
  and distilled water.
Fill to the fill neck of the deaeration tank.

8. Run Engine and Recheck Coolant Level

Start the engine and let it run at low idle (1–2 minutes).
Shut off the engine.
Check the coolant level in the deaeration tank.
If needed, top up to the fill neck and reinstall the pressure cap securely.

9. Fill Coolant Recovery Reservoir

Fill the recovery reservoir (3) with the coolant mixture up to the full line.
Reinstall the reservoir cap.

10. Bring Engine to Operating Temperature

Start the engine again.
Run it at 1200–1500 RPM until the coolant reaches normal operating temperature.

11. Inspect for Leaks

Shut off the engine.
Allow the system to cool completely.
Carefully inspect the cooling system for any leaks.

12. Final Coolant Check

Once the engine is cold, check the coolant level at the recovery reservoir only.
Do not remove the deaeration tank cap at this point.
If necessary, top off the recovery reservoir with the coolant mixture.

Task Complete!
You’ve successfully drained, flushed, and refilled the coolant system on your New Holland T9 tractor, helping maintain optimal performance and prevent overheating issues.

If you want, I can format this into a printable checklist, visual guide, or step card — just let me know! Would that help?

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