TSB
07-24-2 6.4L ENGINE BUILT BEFORE 06/18/2007 - HEATER CORE NOISE - ALSO DESCRIBED AS GURGLING, RATTLE, OR SCRAPING NOISE

Publication Date: November 21, 2007

FORD: 2008 F-Super Duty


This article supersedes TSB 07-22-2 to update the description in the Issue statement.

ISSUE:
Some 2008 F-Super Duty vehicles equipped with a 6.4L engine and built before 6/18/2007 may exhibit a gurgling type noise coming from the heater core. It has also been described as a rattle or scraping noise. It has also been incorrectly identified as a torque converter concern.

ACTION:
Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE

Bring engine to normal operating temperatures.
Raise engine RPM to 2500-2900 range.
Using a hose clamp tool, crimp the heater inlet hose. If the noise goes away, replace the inlet heater hose.
If the noise does not go away, proceed with normal diagnostics.
NOTE: DO NOT ADD AN ADDITIONAL RESTRICTOR TO THE LINE OR MANUALLY MOVE THE EXISTING RESTRICTOR.



NOTE: DO NOT REPLACE THE HEATER CORE.




PART NUMBER PART NAME
7C3Z-18472-K Heater Hose (With Auxiliary Heat Controls)
7C3Z-18472-L Heater Hose (Without Auxiliary Heat Controls)