Lincoln Repair Questions? Ask a Mechanic for Answers ASAP
Hello and thank you for your question,The code 1966 indicates you have a problem with the Driver heater core discharge temperature sensor open circuit. Are you able to do some testing if I provide you with the procedure?
I have enclosed the test steps in the link below for testing the code 1966. Copy and paste the link to your browser to open and view them.https://dl.dropboxusercontent.com/u/104923897/B1966%20Nov%2011.pdf
You can try replacing the sensor if you are not able to do the testing but you do run the chance it may not be the problem. Both codes indicate you have a problem with the discharge temperature sensor so its worth a shot and may very will resolve the problem.
The AC needs to kick on in order for the system to remove the moisture from the incoming air, if you can get the AC compressor to run then that should solve the fogging problem. If you are not getting any air flow in the defrost mode then yes you may have a actuator issue.
The defroster actuator controls the defrost door. The code 1947 indicates a problem with it and or the signal and or circuit to it.
Unfortunately the next recommended step would be to do the proper testing to avoid replacing parts that may not be needed.