F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
b. Less than 45 mm (1.77") - Normal. (Figure 2)
3. Is the bypass thermostat hyper-extended?
a. Yes - Replace the thermostat and radiator. Refer to WSM, section 303-03 Cooling System for both radiator and thermostat replacement and
approved system filling and bleeding procedures. Hyper-extension is the only thermostat failure mode that causes radiator damage.
NOTE
WARRANTABLE REPAIR FOR THE THERMOSTAT UP TO 5 YEARS OR 100,000 MILES. HYPER-EXTENSION OF THE THERMOSTAT
WILL PROVIDE RELATED DAMAGE COVERAGE FOR RADIATOR BEYOND THE EXISTING 3 YEARS AND 36,000 MILES RADIATOR
COVERAGE.
b. No - The thermostat is not hyper-extended and did not cause the radiator leak. Do not use this procedure to provide coverage for the radiator leak
beyond 3 years or 36,000 miles. Reinstall the thermostat. Refer to WSM section 303-03 Cooling System for radiator and thermostat replacement
and approved system filling and bleeding procedures.
Parts Block
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
110107A
2008-2010 F-Super Duty
3.2 Hrs.
Remove Radiator and
Thermostats, Inspect
Thermostats For
Hyper-Extension, Defective,
Replace Both Radiator and
Thermostats (Do Not Use
With Any Other Labor
Operation)
DEALER CODING
CONDITION
BASIC PART NO.
CODE
8575
42
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