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Kevin, Technician
Category: Small Engine
Satisfied Customers: 714
Experience:  Over 10 years as a Deere Service Tech.
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I have a John Deere 6x4 gasoline gator. I have changed the

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I have a John Deere 6x4 gasoline gator. I have changed the water pump, thermostat, and temperture switch on radiator. Today I removed the thermostat, flushed radiator and the motor still running hot. I need help....thanks

Hello, my name is XXXXX XXXXX I can help you with your question.


First of all are you sure that the engine is actually running hot or is the temp indicator lamp coming on or flashing at you? One of the problems that we are starting to see on the older 6x4 gators is the harness in the frame rubbing thru and shorting out wires. The Temp switch for example completes a ground circuit which in turns on the indicator lamp. A short to ground in the wire leading to the indicator lamp would cause the lamp to come on when there really isn't a problem. How long do you drive your gator before the lamp comes on?


Let me know and I will help you narrow down the source of the issue.




Customer: replied 6 years ago.
good afternoon, Kevin I replied back last evening and have not heard from you. we sent you what items you asked about....thanks ty hare

I apologize but the only reply I see is your last one. Unfortunately I don't see any additional information that would have been posted yesterday. Would you mind reposting the information and I will do my best to get back to you.




Customer: replied 6 years ago.
The model # XXXXX and there is #1006x4x0359. I ran water through the water pump side of the motor with a hose while the motor was running with the radiator not in place. The water came out the thermostat side while running the water hose. I removed the thermostat and hooked everything back and drove about 15minutes it began to run hot again. The motor begins to smoke real bad and seems to lose power. Thanks for any help...ty hare

Hi Ty,


As a general rule John Deere Gasoline powered gators have a much larger cooling system then is needed for most circumstances. It sounds like you have done a good job in flushing the radiator and verifying flow through the engine. While the thermostat should be in place for proper cooling I still wouldn't expect to see it over heat in such a short time.


If the smoke you describe is white then it is getting coolant into one of the cylinders. There are two different causes on the gas engines that typically cause coolant to get into the cylinders. The intake manifold is a coolant transfer tube that acts as a bridge between the cylinder heads. In some cases the intake manifold gaskets will fail and cause the engine to ingest coolant. Its rare but it is possible that you could have a failed head gasket. The easiest way to see what cylinder is ingesting the coolant is to pull a the spark plugs and check the color of the plugs. Coolant acts as a steam cleaner in the combustion chamber so the spark plugs will turn light gray to white depending on the quantity of coolant ingested.


Just a tip that you may already know, the coolant air bleed on the top of the engine is the small plug in the top of the intake manifold. Failure to bleed the air off at the intake plug often results in trapped air that can cause the engine to run hot.


Lastly check your oil level if you haven't already. Gators that idle around allot will sometimes fill the crankcase with gas thus raising the oil level. Once the oil gets high enough the engine will start to smoke blue and get hot.


With any luck this has helped to narrow down your cooling issue. If you are satisfied with my answer please hit the "Accept" button. If you need further assistance please feel free to ask.




Kevin, Technician
Category: Small Engine
Satisfied Customers: 714
Experience: Over 10 years as a Deere Service Tech.
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