L2650DT-8-GST overheating

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L2650DT-8-GST overheating

Rick McDonald	Should I be able to see visible signs of water moving in the radiator if I remove the radiator cap then warm the tractor up to operating temperature? I've replaced the thermostat, cleaned the outside of the radiator, made sure screen is clean, tightened the fan belt, replaced the cap all to no avail. It slowly creeps up until it's close to the red, but I have never let it get there.
Sam	If you have a cooling system with a recovery system like a car, the radiator is to full to see the coolant moving. My tractor does not have a recovery system, so the coolant level will be down about 1 inch or so, and you should be able to see the coolant moving. Sounds like you may have a coolant restriction, could be the inside of the radiator is clogged, or the water pump gone out. I've seen water pumps go out and not leak, the impeller that moves the coolant would be rotted away, and just the shaft was turning. If it were me I would drain the cooling system and remove the lower radiator hose, stick the garden hose in the cap area and let the water flow, just to see if it comes out the bottom freely. If not, radiator stopped up, if it flows freely, pump would be next.
Rickie McDonald	Thank you for the quick response. I will try all those suggestions. How can I check the water pump if the radiator is clear? Or is it one of those things you replace and hope it fixes the problem?
8x56mn	It's very common that the radiator may look clean, but will have a lot of crap stuck deep in the fins. You need to blow it out with air. You will amazes at what comes out. Do you have compressed air available?
Sam	The only way I know to check a water pump is remove it. If it's still good and not rusted out, you will have to have a new gasket.If you remove it, that also will be a good time to use the garden hose in the water pump area and flush out the block.
Rick McDonald	Yes, I compeleted that step before posting, and I was amazed at how much stuff came out. Just to be clear I have replaced the thermostat, cleaned between the fins, replaced the hoses, had a hole in the radiator fixed, and made sure the fan belt was tight. Probably should have said that up front.
Rick McDonald	Sam, I just did what you suggested and the radiator is flowing quite nicely. I guess it is on to the water pump. One last question, could the temperature sensor be giving a bad indication? Not really sure how to tell if the tractor actually is overheated since I never let it get into the red. Thanks for all your help guys.
Rickie McDonald	Well I removed the water pump and it looks fine. This is so frustrating. Not sure where to go next with this problem.
Chris	You should verify the engine temp with a ifr thermostat. Like you suggested- maybe you're not over heating and just have a gauge giving a false reading. To check if you have coolant flow through the radiator (i.e. if the waterpump is working) a standard rule is the temp drop from the inlet side of the radiator to the outlet should be within 15*. No drop indicates a bad pump and a higher drop indicates a plugged radiator. Like Sam said, if you have a surge tank you won't be able to see any coolant flow. Without a surge tank you will see coolant flow- only when the t-stat opens. Good luck.

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