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rwest rwest is online now
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Join Date: Jun 2009
Location: St Paul MN
Posts: 5,507
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I don’t have an external cooler, so just throwing out ideas that may or not be useful!

Any chance that the thermostat is plumbed backwards? It seems to me that the oil shouldn’t go to the cooler until it is hot enough. From reading here, but maybe I read it wrong, it sounds like the oil flows out to the cooler all the time, but doesn’t return until the thermo opens?
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1977 911S Targa Chocolate Brown
Old 11-04-2025, 10:29 AM
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