Have a question about my LLY's fan clutch. I posted earlier about it kicking on in the mornings, about 2 or 3 days a week. Regardless of outside temp or climate control settings, stays on for about 1/2-3/4 mile goes off.


Towing the trailer over Memorial Weekend, the fan clutch hardly kicks on, except once on a long hard full throttle pull.


This weekend towing, nearly identical weather conditions, just about any hill and moderate throttle application made it kick in. Twice applying the brakes to slow down I heard it kick on(I presume reduced air flow)


Temp gauge reads one small line under 210* when towing.


Could one of you techs post the test and check procedure for the fan clutch and if what Im experiencing would be "normal". If considered "normal" I guess I need to look at ways to cool her off some more....

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<TD align=middle width="50%">Document ID# 774320
2004 GMC Truck GMC K Sierra - 4WD </TD>
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<H1>Fan Clutch Diagnosis</H1>
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No</TH></TR>
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1</A></TD>
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Were you sent here from Symptoms or another diagnostic table?</TD>
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Go to Step 2 (http://service.gm.com/servlets/BlobShtml?ShtmlFile=774320&amp;evc=sm&amp;pubid=437&amp;cellId =37223&amp;mspsdsubkey=2769#S02) </TD>
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Go to Symptoms - Engine Cooling (http://service.gm.com/servlets/CellHandler?CellId=37429&amp;RefDoc=774320&amp;evc=sm) </TD></TR>
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Is there excessive fan air noise?</TD>
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Go to Step 3 (http://service.gm.com/servlets/BlobShtml?ShtmlFile=774320&amp;evc=sm&amp;pubid=437&amp;cellId =37223&amp;mspsdsubkey=2769#S03) </TD>
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Go to Step 4 (http://service.gm.com/servlets/BlobShtml?ShtmlFile=774320&amp;evc=sm&amp;pubid=437&amp;cellId =37223&amp;mspsdsubkey=2769#S04) </TD></TR>
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3</A></TD>
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Fan air noise is normal during cold engine start up.


Does the fan noise go away at normal engine operating temperature?</TD>
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Go to Step 13 (http://service.gm.com/servlets/BlobShtml?ShtmlFile=774320&amp;evc=sm&amp;pubid=437&amp;cellId =37223&amp;mspsdsubkey=2769#S13) </TD>
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Go to Step 4 (http://service.gm.com/servlets/BlobShtml?ShtmlFile=774320&amp;evc=sm&amp;pubid=437&amp;cellId =37223&amp;mspsdsubkey=2769#S04) </TD></TR>
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4</A></TD>
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<H4>Important</H4>


The engine must be turned OFF and the engine temperature should be cold.





Rotate the fan clutch.


Does the fan clutch rotate?</TD>
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Go to Step 5 (http://service.gm.com/servlets/BlobShtml?ShtmlFile=774320&amp;evc=sm&amp;pubid=437&amp;cellId =37223&amp;mspsdsubkey=2769#S05) </TD>
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Go to Step 14 (http://service.gm.com/servlets/BlobShtml?ShtmlFile=774320&amp;evc=sm&amp;pubid=437&amp;cellId =37223&amp;mspsdsubkey=2769#S14) </TD></TR>
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5</A></TD>
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Visually inspect the fan blades for cracks, looseness or damage.


Are the fan blades in good condition?</TD>
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Go to <A href="http://service.gm.com/servlets/Blo