Engine Coolant Freeze Point

Perform coolant service every 1000 hours or annually, whichever comes first.

1. 

   
   TS281-UN-15APR13

   Explosive release of fluids from pressurized cooling system can cause serious burns.

   Shut off engine. Only remove cap when cool enough to touch with bare hands. Slowly loosen cap to release pressure before fully removing.

   Open hood.

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2. Do not open de-aeration tank cap when engine is warm. Doing so will add air to coolant system.

   
   RXA0148578-UN-02JUL15

   Surge Tank Cap-13.5 L Engine (Shown)

   A - Cap

   B - Max Cold Line

   C - Min Cold Line

   Slowly turn de-aeration tank cap (A) to relieve pressure. Remove cap.

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3. More precise test device is available, see Testing Coolant Freeze Point in Engine Coolant section of this Operator’s Manual.

   Test coolant freeze point using a coolant refractometer available through your John Deere™ dealer. See Testing Coolant Freeze Point in Engine Coolant section of this Operator’s Manual.

4. Visually check cap O-ring for sealing effectiveness. A correctly sealing O-ring will have imprint of tank neck mating surface with no apparent scratches or leak paths. If O-ring is not sealing correctly, replace cap.

   Install de-aeration tank cap.

5. Close and secure hood.