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Ford Tractors Discussion Forum
:

535 thermostat or temperature sender problem?

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kkl

01-05-2013 14:21:18




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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.

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kkl

01-05-2013 17:23:04




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 Re: 535 thermostat or temperature sender problem? in reply to kkl, 01-05-2013 14:21:18  
Thanks very much for the helpful replies. I'm glad to know that I'm not risking blowing a head gasket from a closed thermostat.

As far as I can tell, it's a 1977. I don't get near a dealer very often, but eventually I'll get there. But my luck will be that the CNH part does the same thing... :(



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RodInNS

01-05-2013 16:20:05




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 Re: 535 thermostat or temperature sender problem? in reply to kkl, 01-05-2013 14:21:18  
You plain simple got the wrong sender. Turf the 3/8" one back to the dealer and tell them to get you the 1/8" one with the blade. ALSO... find out the year of the tractor for certain. There were a couple of different resistance ratings on them with a switch around 68 or 69 and the later one carried forward to mabey 79 or so. Just get the unit number from the tractor and have them search it out carefully....
I quite like the electric gauges provided you keep the wires up to code...

Rod

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Fordfarmer

01-05-2013 15:25:35




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 Re: 535 thermostat or temperature sender problem? in reply to kkl, 01-05-2013 14:21:18  
Your thermostat is not stuck shut. If it was, the tractor would be puking coolant in short order. (happened to my 4600 once) It may be the sender, or maybe the gauge itself. My 7000 ran right on the edge of the red all the time (when the gauge worked). Didn't matter if I was hauling manure or pulling a 15' disk. Wouldn't loose coolant until the needle was at the far edge of the red.



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old

01-05-2013 14:39:46




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 Re: 535 thermostat or temperature sender problem? in reply to kkl, 01-05-2013 14:21:18  
One like that can be very hard to figure out. My self I prefer the old but much more reliable maniacal type gauges. Something you can try but will only be a ball park figure is stick a thermometer into the radiator fill hole and watch it and see how hot it shows when it is running



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