John Deere — Testing Thermostats Opening Temperature
Adjustments · Cooling system
From a John Deere operator's manual — check it applies to your exact model before use.
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Before you start
- Do not let thermostat or thermometer rest on container sides or bottom.
Procedure
- Remove thermostat(s).
- Inspect for corrosion or damage.
- Suspend thermostat and thermometer in water.
- Stir water as it heats.
- Observe opening action and compare to specification.
- Remove thermostat and observe closing action.
- Replace defective thermostat; replace both on dual.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Start to open: 82°C (180°F); fully open: 94°C (202°F)
Source: John Deere operator'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.