I replaced the heater core. Initially everything worked except no air was blowing through the passenger vents. Now, no air blows through the vents, only through the defrost and the floor and it's only hot air. I charged the AC, thinking that may have been the problem, but it's still only blowing hot air.
Check you blend door under the glove box see if its opening and closing
SOURCE: Dual Temperature controls inside - 2002 lincoln ls
The problem is most likely a bad dual climate control valve. This component is located on the right side near the radiator under the hood. It will have several coolant hoses hooked to it and 2 silver cylinders protruding from it. You can clamp off the heater hoses at the heater core and see if both sides cool then and this will tell you that the valve is letting coolant thru when it shouldn't be.
This will narrow it down to either the valve or the control head inside the car,or wiring in between them. The only way to narrow it down further is if you have a scan tool that could access the climate control data. Have seen several of these valves cause this concern and have only seen one control head cause it.
SOURCE: climate controls
Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.
SOURCE: My 1996 Lincoln Town car
To fix the AC unit which blows hot air all the time. Seems like you have a small leak in the system or the AC compressor has gone out. Suggest you try recharging the unit. Make sure you have the correct R-22 or 134A freeon. If this work for a few days then have the leak fixed, if this doesn't work replace the compressor. Check Ebay for the compressor i obtained one for $100.00. Cost $450 at Auto Zone.
SOURCE: ac blowing hot air on 2005 lincoln ls. just sarted today
Needs to be recharged and you more than likely have a leak somewhere
SOURCE: 1998 lincoln Town car Air conditioning vent
I have hot air coming out into my car, but their is cold air in
in air conditon system. What Do I Do?
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