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are you using your cold front?? unless i am pulling or driving in sand in the summer across the beach, the only other time is in the winter with the cold front on, the fan gets "confused" because the temp sensor in the clutch has minimal air moving around it....
 

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it might "spin" all the time but until the clutch engages, the fan is never 1:1 with the engine. there is no "load" with the clutch disengaged. Oddly enough the bended winter fuel or this new 2007 ultra-low sulfur bu&(*(@^t is all sorts of bad news for the LLYs. i have significantly more "top end" noise due to the injection pump not getting the lubrication that it was used to a few months ago. There is a ECM update that GM can do to help with the "pinging" but as far as the fan... thats a good question brother! did you get a GM replacement clutch or something after-market?
 

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BG has a great diesel additive... I am using it and it makes a huge difference. Like i said before, the LLY passes the fuel from your tank through the injection pump once for lubrication of the pump itself, and to warm the fuel to a constant temperature & consistency before it is actually pumped through the injection pump to the injectors. The problem with this is that the new ULSD has no film or coating of oil like the old fuel did, so the lubrication factor is terrible, which causes the engine to ping, and that sound is your injection pump starving for lubrication. ITS NOT a good thing in my eyes. When i started using the BG additive, the ping was gone, the top-end noise under cold starts was gone and the mileage went up 2 points at least. The additive as well as the PCM update solved a lot of my problems.
 

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I forgot to list this in my last post...

BG 227D New BG Diesel Fuel Lubricant with Conditioner

BG Diesel Fuel Lubricant with Conditioner is a superior multi-functional fuel supplement. It provides the necessary film strength and lubricity to low-sulfur and ultra-low sulfur diesel fuel to prevent fuel pump and injection parts from scoring and seizing. This diesel fuel additive complies with the Federal low-sulfur content requirements for use in diesel motor vehicles. It will remove deposits from the fuel system and prevent their re-forming. Two ounces (60 mL) of BG Diesel Fuel Lubricant with Conditioner treats up to 40 gallons (150 Liters) of diesel fuel. Catalytic converter and oxygen sensor safe.
Part No. 227D 16 oz. (483 mL) bottle
 

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what is your normal operating temperature? then what is it when the fan is on? will the fan run first thing in the morning with your truck cold? Was the "new" clutch a re-man? There is possibility that one is bad too.... replacement parts fail as much as part they are replacing... or there would never be a need for parts stores :D
 
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