F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
Radiator: Customer Interest
Cooling System - Repeat Radiator Leaks
TSB 09-23-1
11/30/09
6.4L DIESEL ENGINES - REPEAT RADIATOR LEAK -
BUILT ON OR BEFORE 9/14/2009
FORD:
2008-2010 F-Super Duty
ISSUE
Some 2008-2010 F-Super Duty vehicles built on or before 9/14/2009 and equipped with a 6.4L diesel engine may exhibit repeat radiator leaks due to
malfunctioning (hyper-extended) high temperature thermostats.
ACTION
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
1. Verify the coolant leak is from the radiator, refer to pin point test (PPT) A found in the Workshop Manual (WSM), Section 303-03.
2. Verify the venturi tee is installed.
a. If installed, confirm it is installed correctly (note - orientation direction on part). Refer to applicable Field Service Action (FSA) for vehicle built
on or before 5/15/2008.
b. If not installed, install per applicable FSA on vehicles built on or before 5/15/2008.
3. Prepare the vehicle for a test drive.
a. If the coolant leak at the radiator is large enough to cause an unsafe test drive or potential for engine/vehicle damage, proceed to Step 5.
b. Before driving the vehicle confirm the coolant level is at minimum level or above in the degas bottle. If required add 50/50 mix to coolant bottle.
4. Test Drive - use an Integrated Diagnostic System (IDS) or equivalent and monitor engine oil temperature (EOT) and engine coolant temperature
(ECT) parameter identifiers (PIDS).
a. With EOT at 195 °F (91 °C) drive on the highway unloaded at 55-70 MPH (89-113 Km/h) constant speed to observe EOT and ECT temp.
b. Test results/next steps:
(1) If EOT is less than 8 °F (4.4 °C) higher than Ed, and the coolant temp fluctuates roughly 5 °F (2.7 °C) - the thermostats are okay and do not
need to be replaced. Replace just the radiator. Refer to WSM, Section 303-03 (Engine Cooling).
(2) If EOT exceeds ECT by greater than 8 °F (4.4 °C) or if the ECT readings fluctuate 10 to 12 °F (5.55-6.66 °C) roughly every 30 seconds -
replace both thermostats and radiator. Refer to WSM, Section 303-03 (Engine Cooling).
5. If vehicle is not drivable and the coolant leak is found to be from the radiator, remove and replace both thermostats and radiator. Refer to WSM,
Section 303-03 for both radiator and thermostat removal procedure and approved cooling system draining, filling and bleeding procedures.
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.
OPERATION
DESCRIPTION
TIME
092301A
2008-2010 F-Super Duty
3.0 Hrs.
6.4L: Pressure Test
Cooling System, Road
Test, Monitor PIDS
Replace The Radiator (Do
Not Use With Any Other
Labor Operations)
