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Great question dustin but the A/C is suppose to come on in defrost or mix mode- this is floor & defrost. Does not seem to make sense does it. One of the things the a/c does is remove the moisture from the air. You need warm DRY air to remove the moisture from the windows. An automotive H.V.A.C. ( Heating,Ventilation,Air conditioning) first forces air thru the a/c evaporator core then thru the heater core and out the selected vent. If you only want a/c a blend door will by-pass the heater core which is controlled by a hot/cold knob or digital temp cotrol on the dash. Now back to the cold air problem- assuming the basics are all ok- Coolant is full, Engine gets up to proper operating temp-around 195 degrees- upper radiator should be hot. Both heater hoses should be hot. If thats all OK the blend door might not be working. It is controlled by an electric motor called a Blend Door Actuator which are prone to fail. I have replaced many on ford vehicles. Hope this helps
Assuming the radiator is full of coolant, and the engine is reaching normal temp of 190 degrees, you could have a blocked heater core or the temp control valve may not be working on the heater hose. I would check to see if both heater hoses are getting hot.
Make sure you have the heat selection set all the way to heat. In Ford and Dodge vehicles, when you select Defrost the AC compressor actually kicks in and if you have the temperature selection set to the cool side it will push cold air to defrost your windshield.
i believe this is a vacuum operated system. if there is a problem with the vacuum supply to the control unit, it will automatically default to defrost. i would start by checking the vacuum source lines. good luck!
Heater core..easy to replace..find the complete tear down and rebuild book for your car at any part store and follow the directions on how to change it.
Radiator... if its the rad then you pretty much are looking at about 800.00 to 1100.00 for this .
If its the radiator... you will notice your car will start to over heat.
It could be even more serious..like the block might be cracked.
If you see like a steam that looks like smoke coming from the tail pipe then its the block.
Again can be fixed for about 12 to 13 hundred bucks.
Hears hoping im wrong on all accounts. cheers
I would think the door you hear flapping is the door that controls the airflow across the heater coil - and the fan keeps blowing the door closed, preventing the airflow from going across the heating coil. I don't know whether this vehicle is vacum controlled or cable controlled - so either it's a disconnected cable, or a leaking vacum line.