3720 Heater Repair

/ 3720 Heater Repair #1  

Scarborough

New member
Joined
Dec 23, 2025
Messages
2
Tractor
John Deere 3720
To those if you who are as unfortunate as myself here is my issue.
Water collects in the tray under left and right blowers. It freezes and blows the resistor in the heater housing you are lucky, if you are unlucky it burns out the fan motor. John Deere only sells the complete blower fan with the resistor. Expensive! BUT the resistor is available separately from Bobcat. I'm going to upload a few pictures in the hope of helping others save on the repair. In one of the pictures you can see some pooled water. It gets to be about 3/4" deep then when the temperature drops it freezes the fan cage and that is what burns out everything. I plan on drilling a couple of holes through the base tray I know the water will drop on the glass in the summer with the AC on.
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