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Re: 6.0/4l80 first start
Well I'm reasonably sure they are supposed to turn off at highway speeds. Do you have access to any kind of a scanner? Also, not sure if it will work or not, but if you unhook the temp sender it will make the PCM think it's -40*, and that should shut the fans off I would think, of course it will set a code and may force the fans on, not sure because I've never tried it, just thinking out loud. I'm still betting the off temp is set way too low, and isn't actually 200*.
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