Fendt 35: Coolant Mixture Imbalance

Although described as a 'Coolant Mixture Imbalance' indicating an inadequate antifreeze-to-water ratio, extensive research indicates this specific fault code (35) is likely undocumented or inaccurate for Fendt machines. Fendt tractors typically monitor coolant temperature and level rather than mixture ratios directly. If cooling system issues are suspected, diagnostics should focus on standard temperature, level, and circulation faults.

• Farmer Series
• Favorit 600 Series
• 200 Vario Series
• 300 Vario Series
• 400 Vario Series
• 500 Vario Series
• 700 Vario Series
• 800 Vario Series
• 900 Vario Series

1. 1

   Check coolant level in the expansion tank with the engine cool to ensure it is within the recommended range

2. 2

   Inspect the radiator, coolant hoses, water pump, and engine block for leaks or deteriorated, spongy hoses

3. 3

   Examine the radiator fins for blockages from debris and clean with compressed air or a soft brush

4. 4

   Test the radiator cap with a pressure tester to ensure it holds the correct system pressure

5. 5

   Inspect the water pump for leaks at the weep hole and check the pulley for excessive play indicating a worn bearing

6. 6

   Check for abnormal cooling system pressurization, which could indicate leaking copper injector inserts (common on 700 series) or a failed head gasket

1. 1

   Allow engine to cool (Overheating due to a Faulty Thermostat)

   Allow the engine to cool completely.

2. 2

   Drain coolant (Overheating due to a Faulty Thermostat)

   Locate the thermostat housing and drain the coolant to a level below the housing.

3. 3

   Remove old thermostat (Overheating due to a Faulty Thermostat)

   Remove the bolts securing the housing and take out the old thermostat.

4. 4

   Install new thermostat (Overheating due to a Faulty Thermostat)

   Install the new thermostat, ensuring it is correctly oriented.

5. 5

   Replace gasket and secure (Overheating due to a Faulty Thermostat)

   Replace the gasket and re-secure the housing.

6. 6

   Refill cooling system (Overheating due to a Faulty Thermostat)

   Refill the cooling system with the correct coolant mixture.

7. 7

   Test operation (Overheating due to a Faulty Thermostat)

   Run the engine up to operating temperature, checking for leaks and verifying that the temperature gauge reads normally.

8. 8

   Allow engine to cool (Faulty Coolant Temperature Sensor)

   Let the engine cool completely.

9. 9

   Locate sensor (Faulty Coolant Temperature Sensor)

   Locate the coolant temperature sensor on the engine.

10. 10

    Disconnect connector (Faulty Coolant Temperature Sensor)

    Disconnect the electrical connector.

11. 11

    Remove old sensor (Faulty Coolant Temperature Sensor)

    Using a wrench, carefully thread out the old sensor.

12. 12

    Install new sensor (Faulty Coolant Temperature Sensor)

    Apply a small amount of thread sealant to the new sensor and install it. Do not overtighten.

13. 13

    Reconnect connector (Faulty Coolant Temperature Sensor)

    Reconnect the electrical connector.

14. 14

    Test operation (Faulty Coolant Temperature Sensor)

    Start the engine and monitor the temperature gauge to ensure it provides a normal reading.