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Mike, if it has volage, is drawing ample current (have you ever put a clamp on ammeter and measured its current draw?) (If its like a 1500 watt heater at 120 volts, it should be drawing around 12 amps) has continuity, and is actually heating and you hear her sizzlin, looks like that rules out an electrical problem. Are there other choices of locations for use on that tractor??? As you know, anti freeze isnt as good a thermal conductor as water, and Im not familiar with the anti-freeze youre using. Depending on the physical location the heater is in and its size and fluid flow characteristics in that area, perhaps shes too hot for a too small fluid volume area shes immersed in, such that boiling is taking place which emits steam and bubbles and air isnt as good a heat conductor (compared to water)??? Maybe if the unit were in a larger volume mass of fluid (like not tucked down in a small volume bend area etc) with better flow which transferred its heat away better, she may not overheat, the surrounding coolant would gradually rise and disperse heat over a wider area. As Ive often said on this board, Im am electrical not a mechanical or thermo engineer, so if shes drawign current and the elements working and her heat transfer properties are ok (i.e. shes not coated over reducing heat transfer) then the only thing I can think of is a heat transfer problem due to low volume or it being in a poor flow area. Let us know what you find out. Ol John T Nordhoff
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