John Deere — Flush and Service Cooling System
Maintenance
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- Explosive release of fluids from pressurized cooling system can cause serious burns.
- Shut off engine. Only remove filler cap when cool enough to touch with bare hands.
Procedure
- Shut off engine and only remove filler cap when cool enough to touch with bare hands.
- Slowly loosen cap to first stop to relieve pressure before removing cap completely.
- Flush cooling system as described in operator's manual.
- Clean cooling system with clean water and TY15979 John Deere Heavy-Duty Cooling System Cleaner or equivalent.
- Refill cooling system with appropriate coolant solution.
- Loosen plug in side of thermostat housing to allow air to escape when filling system.
- Retighten plug when all air has been expelled.
- Run engine until it reaches operating temperature.
- After running engine, check coolant level and entire cooling system for leaks.
Tools required
- Leakproof containers Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Do not overfill system. Coolant level should be at bottom of radiator filler neck.
- Air must be expelled from cooling system when system is refilled.
Source: John Deere service 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.