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ossiblue ossiblue is offline
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Join Date: Oct 2005
Location: Capistrano Beach, Ca.
Posts: 7,094
I also have a 75 S, and would see numbers like yours under the same driving conditions but that was before I added the external cooler. Now, the temp rarely exceeds 185 under those conditions. Have you checked how clean the coolers--both of them--are? Could they be clogged with oil film or debris? I have no experience with failure of the engine thermostat, but if it is bad I would suspect the temp of the oil line to the external thermostat would be very high. You may wish to check the relative temps of the external lines with an infra-red thermometer. Just a thought.
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L.J.
Recovering Porsche-holic
Gave up trying to stay clean
Stabilized on a Pelican I.V. drip
Old 06-21-2007, 08:45 AM
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