At the end of last summer, mine was sticking open. I cannot tell you its provenance. I replaced with a Wahler, and car runs hot -- 95-105 C on the highway in cold weather. I will be putting in a Behr before summer comes, and will gut out the Wahler for my toolkit. I'll use it to install temporarily and keep for coolant flushing purposes.

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David
1986 300E Anthracite + ECodes + MB Mileage Award