Massey Ferguson 10.00.19 – AIRCON: Issue With The Heater Valve (AIRCON)

The climate control system has detected a malfunction with the cab's heater control valve. The underlying condition is typically an electrical fault (such as an open circuit or short in the valve's wiring), a valve that is mechanically blocked open or closed, or a binding control cable.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 4700 Series
• 4707
• 4708
• 4709
• 4710
• 5600 Series
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5700 Series
• 5700SL Series
• 6700 Series
• 6700S Series
• 7600 Series
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7700 Series
• 7700S Series
• 8600 Series

1. 1

   Check the Manual Coolant Flow Valve: Ensure this valve is in the correct position (open/inline for winter heating, closed/crossways for summer AC). If it is closed, hot coolant cannot reach the cab heater valve.

2. 2

   Inspect Hose Routing: Verify that the heater hoses have not been installed in reverse order during a previous service. If the hoses are reversed and the heater valve outlet side is exposed to pressure, it can permanently damage the valve.

3. 3

   Check Electrical Connections: Inspect the wiring harness and connector at the electronic heater valve for corrosion, broken wires, or loose pins.

4. 4

   Check Cable Adjustment (If Applicable): If the tractor utilizes a cable-operated valve linked to an electronic actuator, check the cable for rust, binding, or improper adjustment to ensure the valve is fully opening and closing.

1. 1

   Locate the Heater Valve

   Depending on the tractor model, the heater control valve is typically located either under the cab roof panel (near the AC evaporator/heater core) or at the front firewall/engine block.

2. 2

   Drain Coolant

   Partially drain the engine coolant to a level below the heater hoses to prevent spillage inside the cab or over the engine.

3. 3

   Disconnect the Valve

   Unplug the electrical connector from the heater valve (or disconnect the control cable if it is a mechanical valve driven by an actuator).

4. 4

   Remove Hoses

   Loosen the hose clamps and carefully remove the inlet and outlet heater hoses from the valve.

5. 5

   Install the New Valve

   Mount the replacement heater valve. Crucial step: Ensure the hoses are connected in the correct flow direction (inlet vs. outlet), as reversing them will damage the new valve.

6. 6

   Reassemble

   Reconnect the electrical harness or control cable.

7. 7

   Refill and Bleed

   Refill the engine coolant. Open the manual coolant flow valve (if equipped), start the tractor, and let it run to bleed any air pockets out of the cab heater loop.

8. 8

   Clear Codes

   Use a diagnostic tool to clear the 10.00.19 fault code from the AIRCON module and test the climate control system to ensure proper temperature blending.