John Deere – 1023E, 1025R and 1026R – Test Thermostat

[1] – Park machine safely.

[2] – Allow engine to cool.

[3] –

Check that cooling system is cool and squeeze top radiator hose to check that system pressure has dropped.

[4] – Remove thermostat. (See Remove and Install Thermostat in Section 20, Group 10.)

[5] – Suspend thermostat and a thermometer in a container of water.

[6] – Heat and stir the water. Observe opening action of thermostat and compare temperatures with specifications.

[7] – Remove thermostat and observe its closing action as it cools.