Heating Issues

Kev7770

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Hello! I have a 2003 Lincoln Towncar that threw a code for coolant temp being too cold. I had the thermostat changed and that resolved that issue. It also made the car warm up faster, prior to that it would take forever to do so.

However today I noticed that my heat only works when the temp Is maxed out (90 degrees). But the fan blower works on any speed. Anything lower than 90 blows lightly more than cold. There is no difference between 70 degrees and 85. Do you know what could be causing this? Additionally, I noticed that my top radiator hose is getting hit. But even after an hour and a half of highway driving, my lower hose is cold. Almost feels full of air. I had the coolant changed about 10k miles ago. Was dirty before.
 

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