2001 Mercury Grand Marquis "whats ac blows defrost" Questions

...Grand Marqis ls. The AC does not work and it blows hot air constantly only from the defroster. What is the problem? Only blow hot air and only form defroster. You may need a recharge on the A/C ...

ac blows out defrost putting out codes 051 053 any clues on what these codes mean Unsure of codes as they should have 4 digits, but generally air only coming from defrost = vacuum leak, bad vacuum ...

...whats the matter. in ur ac htr system ur mode doors are also contrlled by vacuum switchin and being stored in a small vacuum ball or a small storage place like a small tank. u should have two vacuum ...

...ac off and turn the heat on in my 1998 Mercury Grand Marquis. How do I control the thermostat? I have tried putting on auto,vent,floor/defrost,defrost, and turned the temp up to 90 and it blows cool ...

ac switches from blowing in dash vents to defroster vents on its own. What controls the valve and where is it located? Does it only change when going uphill, or under heavy acceleration? Or is it just

...defrost.ect. Also will not switch to ac. I can control temp, and read outside temp. Control understands command, just will not respond. What's up, can you help? Marty Run self test on heater control ...

...defrost vents only, too; but with no vacuum leaks. I was told then I needed the AC/Heater Control Switch; but instead I made it a "manual" automatic climate control. I disconnecting the vacuum ...

...AC blows cold air. I can select, defrost, vents, floor, etc and have air come out of those zones. The 30 amp fuse under the steering wheel tests OK. how can i confirm a blend door without taking off ...

...ac quit, he fixed the blower, but it only blows out of the defrost and floor. He's working on that one now. i have the same problem, but it only happens sometimes,and clears its self in one or two ...

...ac charged and now the air only blows through the defrost vents no matter what the air settings are on. the actuator to the defrost door is inop. try running the climate system thru all the modes ac ...