Quote Originally Posted by GTP131 View Post
Is it possible to install the T-stat upside down? Not sure if that would make any difference anyway.

You can also try bleeding the system with the bleeder screw on top of the t-stat housing.

Another option, drill a small hole or two in the thermostat to allow air to escape.
You cant put it upside down. But drilling 2 small holes is not a bad idea