When I bought my 535 two years ago, the temperature gauge wasn't working. I recently installed a block heater, changed the radiator hoses, changed the coolant, and replaced the temperature sender unit. The connector tab had broken off. The sender I got from the tractor dealer 75 miles away was the wrong size (uggh!), so I went to the local Carquest. They found one that was nearly identical physically to the broken one (Carquest 72-4663).
Now, I have a working temperature gauge, but after warming up, it is always right on the redline position. After some modest work today in 45 degree weather, the gauge is at redline, the upper radiator hose and radiator are warm, but not uncomfortable to touch. The lower radiator hose is cool. The few times I've started it since the changes, I've always used the block heater first. I've used the tractor on some very hot days in the past (with no temperature gauge) and it has never vented coolant.
Does this sound like a failed thermostat in the closed position? An incorrect reading from a wrong temperature sender? What do you think? Thanks for helping.
Now, I have a working temperature gauge, but after warming up, it is always right on the redline position. After some modest work today in 45 degree weather, the gauge is at redline, the upper radiator hose and radiator are warm, but not uncomfortable to touch. The lower radiator hose is cool. The few times I've started it since the changes, I've always used the block heater first. I've used the tractor on some very hot days in the past (with no temperature gauge) and it has never vented coolant.
Does this sound like a failed thermostat in the closed position? An incorrect reading from a wrong temperature sender? What do you think? Thanks for helping.
