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This may or may not be your problem. But here is a TSB on Fans in the 6.0. Sorry, but the figures didn't paste in.
07-3-10 • LACK OF COOLING FAN OPERATION - 6.0L
Publication Date: February 2, 2007
FORD: 2003-2005 Excursion
2003-2007 F-Super Duty
2004-2007 E-350, E-450
This article supersedes TSB 07-1-4 to update the part list.
Some 2004-2007 E-Series 350/450, 2003-2005 Excursion, and 2003-2007 F-Super Duty vehicles, equipped with the 6.0L diesel engine, may exhibit improper engine cooling fan clutch operation due to its wire harness being cut by the rotating cooling fan.
If the fan stator/shroud retaining clip is broken or missing, use the following Service Procedure to secure the wire harness to the fan stator/shroud.
1. A cut wire harness will prevent proper fan clutch operation. If the harness is damaged or severed, replace the Cooling Fan Clutch Assembly per the Work Shop Manual, Section 303-03. The harness may be cut because the molded-in retaining clip on the fan stator/shroud that secures the harness to the fan stator/shroud is broken or missing, allowing the loose harness to move into the rotating fan (Figure 1). Secure the harness to the fan stator/shroud using a screw to secure it to the stator/shroud.
Figure 1 - Article 07-3-10
2. Carefully drill a 1/8" (3.2 mm) diameter hole through both the tab on the harness and the stator/shroud as shown (Figure 2). Hold the harness fully down in the stator/shroud slot while drilling the hole in order to assure that the harness will be positioned away from the rotating fan.
Figure 2 - Article 07-3-10
3. Install and tighten the screw to 9 lb-in. (1 N-m).
4. Check to make sure that the harness is held securely to the stator/shroud and away from the fan.
PART NUMBER PART NAME
4C3Z-8A616-AA Fan Clutch Asy (Vehicles Without Snow Plow Package)
4C3Z-8A616-SA Fan Clutch Asy (Vehicles With Snow Plow Package)
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
070310A 2003-2007 Super Duty, 2003-2005 Excursion 6.0L: Replace The Fan Clutch, Includes Time To Secure The Wire Harness (Do Not Use With 8616A, 8005A, 8005AZW, 8146A, 8600A) 1.5 Hrs.
070310A 2004-2007 Econoline E-350/450 6.0L: Replace The Fan Clutch, Includes Time To Secure The Wire Harness (Do Not Use With 8616A, 8005A, 8005AZW, 8146A, 8600A) 1.9 Hrs.
BASIC PART NO. CONDITION CODE