Ford: automatic climate control, automatic climate control, control cables

Question
I have a 1989 Lincoln towncar and I am getting very little heat from it. The thermostat, radiator and heater core has been changed. And still there is very little heat. What is next to change? Thanks for your help  

Answer
KJ

well you have done everthing you should.the only things to check is to make sure the thermastat was put in the correct way,and the correct rating.the correct one for that car is 180-190 degrees.make sure your hoses are not collapsing ase the car is warming up,the bottom one is usaully the problem.check the control cables that go from cold to hot,somtimes the tab holding the cables pops out or breaks.the only other thing i can think of is your block is plugged,it would be a good idea to have the engine flushed,believe it or not i have seen this many times.hope this helps.

ken