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TSB
11-1-7
  • 6.4L DIESEL ENGINES - RADIATOR LEAK DUE TO HYPER-EXTENDED BYPASS THERMOSTAT
Publication Date: January 19, 2011

FORD:
2008-2010 F-250, F-350, F-450, F-550

This article supersedes TSB 10-17-9 to update the Service Procedure.

ISSUE:

Some 2008-2010 F-Super Duty vehicles equipped with a 6.4L diesel engine may experience an external coolant leak at the radiator. This may be caused by a hyper-extended thermostat. If the bypass thermostat hyper-extends, it causes the primary thermostat to oscillate. This oscillation causes thermal spikes throughout the cooling system and stress on the radiator tubes.

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