I just ran the eng. up to operating temp. and the thermo. cover didn't leak. I added more coolant as she needed it. I am a little gunshy to try and remove the other 2 bolts. The engine is warmed up, but it's raining now, so it will have to wait. From what I can see, there would be enough of the bolt sticking out to grab with with a pair of vise-grips once the cover is removed. I guess a good shot of WD-40 might of helped.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section