I am having similar issue with 110tlb and wondering if you have resolved your overheating problem. I have replaced headgasket, boiled out head and radiator, new thermostat and water pump. Im wondering if a airlock can be causing temp spike and how to resolve? I would greatly appreciate any help! Thank You, Bill
I wondered the same thing last month when trying to find the cause of a sudden temperature rise on my John Deere 310. I Replaced the return hose from thermostat to radiator and the temp sensor with no effects. From the way the hose is shaped I know that an air lock is possible, but from my work installing in-floor hot water heating systems I know that any airlock can be overcome by a relatively small pump - and the JD has a strong pump. So no worries there.
To check if maybe I'm wrong about the impossibility of being an air lock in my new radiator hose I taped that candy thermometer to the radiator hose so I could directly check if hot water was flowing in the hose. It was.
Still, my tractor's dashboard temp gauge showed too hot although the motor didn't seem to be running hot, and the coolant didn't make the hose feel too warm.
So Here's what else I did:
1. Took out the thermostat and tested it in hot water with a candy thermometer.
2. Bought a new temp sensor and used it to test the temp gauge.
3. Removed the radiator fan side shields and sprayed the radiator from back to front with warm household water pressure, soap, soft brush.
4. Put the shields back on with new sticky-back foam that seals good to the radiator.
5. Did a Preston Radiator flush. i.e. Distilled water, Prestone, idle 15 min. then purge. Inspection mirror shows it is cleaner.
6. Refilled with JD's 50/50 water/glycol mix. 50/50 mix is best for transfering heat & for cold protection.
7. checked the water pump fan belt.
Result: Whatever is going on, I am now confident it isn't in the cooling system. The cooling system is working as good as designed, and you know JD didn't design it to overheat.
rScotty
again, Bill
