Just curious, we have the this old Harrison Cooler front mounted on our 0290-D2. I know they are heavy beasts but people also say they are not efficient. However, we were just talking that even in the middle of the summer I can't remember ever seeing the temp above 200 even in an extended climb. During the winter we have to tape it over nearly completely just to keep temps around 150. I'm assuming that our temp gauge is correct because it matches outside temps in the summer before we startup.

Are there internal engine parts (vernatherm?) that maybe are not adjusted properly? I hear so often people concerned over high temps but not anyone with low temp problems.