Look at what Vintage Precision sells. For approximately $100 you get a nice housing and a 160 degree thermostat that fits in perfectly on the head. It also has two threaded ports for a heater and thermo probe if you want. Last week they were backordered for a few weeks.
Vic
I'm interested Bill. What brand and part # did you use? Or from what model vehicle. I'd like to give that a try.
Bettlser,Don't know what kind of thermostat this is but, goes from low to alcohol to hot, I set it at mid point for the summer and hot for the winter. The air blows out at 160° on the hot setting.
...They even made louvers that opened and closed and mounted in front of the radiator...