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Ben,
I have a similar groan when my engine is cold, the fan is on, transmission in drive, slowing down or stopped with my foot on the brake. It goes away when I turn the fan off, or I step on the gas. I haven't watched the temp gauge for when it goes away. Sound familiar? I posted this question to the list not to long ago, and someone mentioned it could be the fan, or something in the fan. I haven't found anything in the fan. One reply stated that if it is the fan, in all his years of working on Volvos, he has never seen one go bad.
Matt
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