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John Deere Tractors Discussion Board

Re: Thermostat for a John Deere M

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Posted by James Howell on September 29, 2012 at 05:56:13 from (

In Reply to: Thermostat for a John Deere M posted by Jackson5 on September 28, 2012 at 19:39:17:

There is no thermostat for either the M or the MT tractor; the thermo-syphon principle is used for the cooling system.

Installed a new radiator on "Sam" one of our 51MTs and idle temperature is 180o.


The temperature rises to 210o under a load either raking or mowing even with a new radiator.

You can use a "kitchen" thermometer to check the accuracy of the temperature gauge.

There has been some discussion in the past that the location of the sending unit also has an effect on temperature.

If the temperature gauge sending unit is located on top near the heat shield, then the temperature might read higher.


If the temperature gauge sending unit is located on bottom of the block near the oil line, then the temperature might read lower.


Cleaning or flushing the radiator might also help.

The operator's manual recommends about 31/2 gallons of water in the radiator.

There has been some discussion in the past that over-filling the radiator might cause the thermo-syphon cooling system to operate incorrectly.

Hope this helps.


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