Dave thanks for the suggestion. I have read a lot of stuff on air and "burping" the system and when I flush it I will certainly pay attention to that. I've heard that the best and easiest way to do it is to run it with the reservoir cap off and let it bubble off.
The thermostat did not have a weep hole, which did concern me but it was what I had available nearby. It is the 195 degree thermostat, also what they had available. I'll keep that in mind if I keep having an issue, maybe get by until I can find the OEM thermostat.
This system absolutely needs to be flushed, and I'm anticipating I'll have to run distilled water through it about three or four times to get all the gunk out. When it runs it I'm getting a lot of fine rust particles in the coolant reservoir. After sitting for ten years (at least) I'm sure the radiator is pretty crusty inside. That can only help.
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