... all my wrenching is going wrong this week. I had to put my coolant flush on pause because of weather, and resumed today ... well, the t-stat housing will not budge. I swear I've got all the bolts out. Is this a common issue? Or am I just totally missing something here? How can I loosen it so I can remove the t-stat for flushing purposes? I don't want to damage the housing.
Maybe it's me, but it seems like there's just always something. Such is life, eh?
Edit to add: This is the 240D. Details, details ...

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)