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.
PXL_20251222_161400082.jpg
Screenshot_20251223-173705.png
 

Attachments

  • PXL_20251223_232354919.NIGHT.jpg
    PXL_20251223_232354919.NIGHT.jpg
    3.4 MB · Views: 8
  • PXL_20251223_232337977.NIGHT.jpg
    PXL_20251223_232337977.NIGHT.jpg
    3.4 MB · Views: 8
  • PXL_20251223_232220817.NIGHT.jpg
    PXL_20251223_232220817.NIGHT.jpg
    3.3 MB · Views: 7

Tractor & Equipment Auctions

UNVERFERTH 330 8 AND 1/2 INCH EXTENSION STUB TUBE WELDMENT FOR FRAME (A55315)
UNVERFERTH 330 8...
32in. Tilting Bucket Mini Excavator Attachment (A59228)
32in. Tilting...
skeleton / rock bucket (A56857)
skeleton / rock...
DEUTZ MARATHON 60KW GENERATOR (A55745)
DEUTZ MARATHON...
Dodge Charger (A56859)
Dodge Charger (A56859)
2007 KUBOTA KX121-3 SUPER SERIES EXCAVATOR (A60429)
2007 KUBOTA...
 
Top