When you put the thermostat in, did you put it in right side up? Are you using the correct type for a series emgine, with the collar?
There is no "current" output from the temp sender. Check for 10 volts at the wire, disconnected from the sender. Look for a low resistance (100 ohms approx) at the cold sensor. Better yet, replace it with a mechanical temp guage.
As PUR says, give the system a good flushng with a commercial product, or take the rad to a shop and have it boiled and flushed. They use a high capacity pump with a vlave to rapidly reverse the flow, many tines. A swimming pool pump makes a good radiator flushing pump. Correct operating temp is 80C (176-180F)
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