| Symptom | Problem | Solution |
Heater Not Blowing Warm Air. | Dirty recirculating filter. | Clean filter. |
| | No thermostat in water outlet manifold. | See your John Deere dealer. |
| | Defective thermostat in water outlet manifold. | See your John Deere dealer. |
| | Heater temperature control defective. | Replace control. |
| | Kinked heater hose. Defective heater valve. | Straighten or replace. Replace valve. |