I think that the fan on those is controlled by the engine management
computer. If so, there is nothing you can easily do to kick it in sooner.
Do check the oil for signs of anti-freeze contamination. The intake
manifold gaskets on that series of engines fails with alarming
regularity. The most sensitive easy way to check is with a $25 used
oil analysis at your next oil change interval. www.blackstone-labs.com
is one of the companies which can do the analysis for you by mail.
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