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Old 07-31-2008, 12:08 PM
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Problem or Not?

I enjoy reading and learning from so many experts. I have a 2008 SD 6.4L with 26,000 miles....I've experience many of the items discussed here..I need some advice with this one. This summer ONLY not last summer...with the AC on and when accelerating from stopped or slow speed...as RPM's of engine increase... a blower or fan noise really takes off...then decrease when higher speed is achieved and the engine RPM's level off. It didn't do this last year and the dealer claims it's normal, but it has been in for most of the TSB reprograms...I may need to test drive a new truck just to see if other's act the same....Any Ideas?

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Old 07-31-2008, 02:39 PM
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Does it have the snow plow package?
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Old 07-31-2008, 05:55 PM
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its your fan clutch engaging. when the truck sits, the underhood temps build and cause the clutch to engage, something would be wrong if the noise didnt go away in the higher rpms
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Old 07-31-2008, 07:12 PM
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Originally Posted by Dusten View Post
its your fan clutch engaging. when the truck sits, the underhood temps build and cause the clutch to engage, something would be wrong if the noise didnt go away in the higher rpms
I think he is talking about the AC fan
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Old 07-31-2008, 09:49 PM
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i doubt it...
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Old 07-31-2008, 09:59 PM
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Maybe it the rad fan speeding up. The reason it might be doing it this summer and not last summer is probably because you have some debri in the radiator. When the truck is cold take a hose to the radiators and clean the fins.
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Old 08-01-2008, 04:00 AM
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Thanks for the responses. It does not have the snow plow package...The fan noise sounds like it's coming from the right side of the engine compartment. It will do it even when cold right out of the garage. It doesn't do it everytime I accelerate from a stopped position...The fan noise is quite loud and annoying...the part that concerns me is the fact it started after the 2nd radiator replacement (leaks) and the fact it didn't do it last summer. It doesn't do it unless the AC is on. Thanks for the help!!!
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Old 08-02-2008, 09:50 AM
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There was an issue with heater core noise. That would be in that area.The TSB is 07-22-2. It explains how to check it out.
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