2008-2010 FORD F-Super Duty DIESEL ENGINES REPEAT RADIATOR LEAK BUILT ON OR BEFORE SERVICE PROCEDURE

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DIESEL ENGINES REPEAT RADIATOR LEAK BUILT ON OR BEFORE ISSUE ECT temp. Some 2008-2010 F-Super Duty vehicles built on or b. Test results/next steps: before 9/14/2009 and equipped with a 6.4L diesel engine may exhibit repeat radiator leaks due to (1) If EOT is less than 8 °F (4.4 °C) malfunctioning (hyper-extended) high temperature higher than ECT, and the coolant temp thermostats. fluctuates roughly 5 °F (2.7 °C) – the thermostats are okay and do not need ACTION to be replaced. Replace just the Follow the Service Procedure steps to correct the radiator. Refer to WSM, Section 303-03 condition. (Engine Cooling). SERVICE PROCEDURE (2) If EOT exceeds ECT by greater than 8 °F (4.4 °C) or if the ECT readings 1. Verify the coolant leak is from the radiator, refer fluctuate 10 to 12 °F (5.55-6.66 °C) to pinpoint test (PPT) A found in the Workshop roughly every 30 seconds – replace Manual (WSM), Section 303-03. both thermostats and radiator. Refer to 2. Verify the venturi tee is installed. WSM, Section 303-03 (Engine Cooling). a. If installed, confirm it is installed correctly (note – orientation direction on part). 5. If vehicle is not drivable and the coolant leak is found to be from the radiator, remove and b. If not installed, install Venturi Tee Kit on replace both thermostats and radiator. Refer to vehicles built on or before 5/15/2008. WSM, Section 303-03 for both radiator and thermostat removal procedure and approved 3. Prepare the vehicle for a test drive. cooling system draining, filling and bleeding a. If the coolant leak at the radiator is large procedures. enough to cause an unsafe test drive or potential for engine/vehicle damage, proceed PART NUMBER PART NAME to Step 5. 8C3Z-8575-D Thermostat Assembly 8C3Z-8009-B Radiator Assembly b. Before driving the vehicle confirm the 8C3Z-8B379-B Venturi Tee coolant level is at minimum level or above in the degas bottle. If required, add 50/50 WARRANTY STATUS: Eligible Under Provisions Of mix to coolant bottle. New Vehicle Limited Warranty Coverage 4. Test Drive – use an Integrated Diagnostic IMPORTANT: Warranty System (IDS) or equivalent and monitor engine coverage limits/policies are oil temperature (EOT) and engine coolant not altered by a TSB. temperature (ECT) parameter identifiers (PIDS). Warranty coverage limits are determined by the identified causal par