Heater not getting hot? Heater not working?

I found out that it was the cylinoids. I swaped it out with a new one. I had to get all the air out the system for it to work. The part cost $291.29. It took about 3 hours to do.

'03 lincoln ls 40k miles v8. Ac works fine, but no heat. Blower works but the air comes out the temp of the vent and never gets warm. It worked fine then suddenly stopped. Any diy suggestions? Thank you in advance

I had this same exact problem with my 2000 LS, after cleaning out the heater core, topping off the coolant, changing the thermostat and replacing the dual climate control unit, the problem was the heater control valve/solenoid located on the front right corner of the car. Hope this helps.