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Old 09-16-2010, 04:54 PM   #27 (permalink)
FlashT
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Join Date: Jul 2010
Location: Covington, LA
Posts: 7

DZLBUG - '98 Volkswagen New Beetle TDI
90 day: 41.97 mpg (US)
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This mod would be great in the winter and would allow the engine to heat up faster. However, I would be concerned about the increase in coolant temp. during the summer. Especially since having high coolant temps. would cause the ECU to retard injection timing, which would result in worse fuel economy and less power. Higher under-bonnet tempertures will also promote premature wear of critical electric and mechanical components under the hood.
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