Howl or whine noise inside after the a/c compressor lines replace

Often when a A/C compressor locks up it starts sending shavings and debris up the line which contaminates the drier and clogs the expansion valve or fixed orifice (depending on which one it has) long before it actually locks up.
You should replace the drier, expansion valve or orifice plus flush the system.
And hope you have not sent debris into the new compressor.
You should always include your make model and year of vesicle when posting a question.

If neither one of the air shocks are moving its either the compressor or the main line has a hole, nick, crack, is smashed together somewhere after the compressor.

Two things pop immediately to mind...

but before even going there... be VERY CAREFUL 275 pounds seems terribly high for an '89... If something cuts loose at that pressure you best have all your helmets, flak jackets, gloves, glasses & cups on... (I'm just saying).

Pressure line should be hot and suction line should be cool... coming back to the compressor.. Yes...??

Lets get to the two things on my mind:

1. Malfunctioning Heater-A/C baffles cause lotsa grief.

2. Drier: Desiccant saturation by exposure to atmospheric moistures... replace or attempt recovery by pulling & holding a SERIOUS vacuum before re-charging your system.

ELSE: Ice crystals will form at the "ORIFACE" and PROFOUNDLY AFFECT PERFORMANCE...

PLEASE Note.
Pulling & holding a 29 vacuum also certifies your main compressor seal (ergo... refrigerant & lubricant will remain intact)... Any trace of OIL BUILD-UP on the front of the COMPRESSOR (or inside the hood in alignment with your compressor pulley) should be addressed... oil level checked & augmented (only as needed)).

Hope this helps

Seal

http://www.rockauto.com/en/catalog/mercury,1989,grand+marquis,5.0l+302cid+v8,1199505,heat+&+air+conditioning,a/c+compressor+seal,6676 More Information for MOTORCRAFT YE57

Drier

More Information for SPECTRA PREMIUM COOLING DEPOT 0233168

Is the whining noise coming from the engine compartment where the compressor is located or is the noise coming from inside the car? If the noise if coming from inside the car it could be your blower. When a blower wears down the bushing is the first thing to wear down and it begins to have play. That makes the blower/fan vibrate making a loud whining noise. Replacing the blower could solve that whining noise.
If the noise if coming from the AC compressor, it also could be a bad bearing within the compressor.

well i dont know about the howl but i would definitely get the rotors resurfaced they are not supposed to stop at one point if the tire is in the air and spin it by hand the tire should come to a smooth slow stop and bearings are very tricky to spot i would replace them just to be on the safe side

In replaceing the a/c compressor you need to replace the a/c filter/drier. The drier is located on the right side of engine compartment,next to the radiator and condenser. The drier absorbes moisture out of the a/c system. If lines were open the drier is like a sponge and will **** up all the moisture from outside. Be sure when replaceing the drier that you pull a vacuum on the system to remove air and moisture from system before you refill with freon. By doing this it will correct your problem. Hope this will help you.

sounds like one of your pulleys. power steering pump, altanator, ac compressor, something along those lines.

The pattern you describe is consistent with an alternator going bad. Maybe the fields are already rubbing together. Test it this way: Start the car and leave on idle, when the whine is worse, then start using up electricity, by increasing the demand. Turn on AC, then lights, then full blower and then high beams. If there is a change in the whine, then either alternator or voltage regulator is the culprit. When a compressor pulley bearing is bad, noise shifts just by turning AC on and off.

Not really expensive just messy to repair. Return lines (low pressure) are much more common and they travel along the frame rail on the right side of the subframe from the power steering rack to the cooler line in front of the radiator. The high pressure line starts at the pump and travels over the top of the motor to the back side (it's a thick line with a big banjo bolt at the pump). They go too but less frequently.

If it's the return line and not the pressure line you can cut it and put some rubber hose from the parts store over the cut part with a couple clamps and that'll hold you for quite a while till you can get the line and get it installed.

The return line, done correctly, can be a bit of a bear on the ground but it's fairly quick in the air on a lift at a garage. The pressure line isn't too bad and can be undertaken by the home mechanic.

Why? Is the compressor bad?