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There's NO "pump" in the heater, just a check valve at the bottom. Heated coolant rises, drawing cold coolant into the bottom of the heater. Take the heater apart, and take a look at the port and check valve at the bottom. Not too long ago, a customer's heater wasn't working, and when I took it apart, it was completly plugged at the bottom with antifreeze slime and corroded aluminum. If the check valve or housing is bad, you can get a new housing, # AR42991, from DEERE, for about $95.00. Also, are you SURE the fitting at the block drain port is "open"? It's pretty small, and easy for crap to clog or partially clog. An aftermaket heater, such as a Phillips-Temro will work fine, as well, for less $$. How cold does it get where you are, and how do you use the heater... do you need quick heat to start the tractor within an hour or two of being plugged in, or do you routinely plug it in the night before? The DEERE heater is (I think) 1500 Watts. I live in northern ND, where it gest COLD, and keep the tractor in an unheated polebarn, usually plugging it in the night before I intend to use it. I have an 850 Watt aftermarket heater, and it has always been adequate for this scenario, even at -25ºF.
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