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May I have the engine size of your Ranger? And the actual "p-code" associated with the low-temp description?
Not a problem if you don't have the p-code. Let me give you some insight now, and if we can't solve the problem here... then we can get the p-code.
If the housing came with a new thermostat, I will assume it is the correct one and installed correctly. So, the problem here may lie in the Engine Coolant Temp (ECT) Sensor. It may have been damaged in the housing replacement. Carefully inspect the electrical connector and wire harness for any loose, broken or damaged wires. If the visual inspection checks ok, I would recommend replacing the sensor. For an image location view of the ECT, click here: https://www.dropbox.com/s/dapqb3g10zdpb93/40-ect.jpg?dl=0
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Correct. The one on the right- as shown in the image I sent. Click the link to see the image.
This system is pretty much a self-bleeding system, so air pocket shouldn't be the issue. There is a basic bleed procedure to try though: