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FYI, these newer mitsubishi compressor that Cadillac started using on cars in 1998 are going bad with age. I have replaced a bunch of them. The do make an internal knocking noise and it get to the point they can't pump freon in the system, worn out. But, they last a hell of a lot longer than the Harrision compressors on the late 80's and 90's. 

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Yea my compressor started sounded like it had a buzz too it  tried to explain but it seemed Boone understood me I listen to my car everyday every tick boom and rattle and that sound was not normal so from day one not Tryna say hey I was right but I new there was somthing wrong with my compressor it just sounded different . And I new it was not right these guys are very helpful . Awesome might I add 

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I am sure that Barczy01 does not know the entire history here. 

Barczy01, here is the OPs original post

Ok sup fellas I'm in a 1998 Cadillac Seville  this car was a blessing at the price . I've only replaced a coil and rear air shocks every thing else has been fine until I leave to go out of town (2 1/2 hour trip and my wife hates the heat (Texas ) so I try to make it more comfortable my Ac wasn't freezing cold but I was fine with it I drive it every day . So I want not to hear my wife complain about the heat so I had my brother in law add some freon for the trip ( ??) the air got a lil cooler but not very cold so we drove there no problems until the next day . It's make a ticking sound from compressor  and blow hot air Please help ice been quoted prices from 125 to 1200 I want this done asap but would like insurance that person is reliable on price and did all that needs to be done can I buy a used compressor with warranty and replace dryer and get away with it . ???????

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So it was cooling adequately but before the trip you added Freon, and blew hot the next day.

1A)  The AC blew hot air PLUS there were 2 current AC codes for actuator and an air inlet problems, the actuator which controls temperature was probably were responsible for delivering warm are through the vents.  You actually heard it clicking

1) the video you sent to us did not disclose a NOISE problem that I could hear with the compressor engaged a typical compressor 'rattle' noise is normal when they are running, you were showing us how it was rubbing up against something,  I did notice that it did not cycle during the entire video.

2) you kept playing around with your Freon, adding Freon it and then arbitrarily letting Freon out.   You had a time where the compressor would not start after you let out Freon.  Then you put Freon in again and it started.  You are using the little cans, and it has not been evacuated and recharged properly by an experience AC tech.  

3) the pipes were cool but you were getting warm air delivery, possibly indicating an actuator problem given you had 2 current AC air delivery codes

4) you delayed giving us the codes for a LONG time which showed 2 current AC codes, during which time you added and let Freon out without proper equipment and without evacuating and recharging the system correctly.   My first post back on June 30th asked you to retrieve the codes.

5) you still HAVE two CURRENT AC codes one of which can cause heater air to come through the vents depending upon where the actuator sticks and regardless what the temperature dial is set to.  

6) you never had the system properly evacuated and recharged, and you have NO idea how much Freon is in it, your brother in law added Freon to a working system using cans and it stopped working during a trip. I have counted that you have added Freon on at least 3 occasions and then manually let it out, what twice?

7) An overcharged AC system can cause COMPRESSOR NOISE and damage!  See this http://www.ehow.com/info_7834056_signs-symptoms-overcharged-ac.html

You are not trying to say you were right?   :blink: :lol::lol: I am rolling on the floor over here!   You had and still have a ton of things wrong with your AC including 2 current air delivery codes and have not evacuated/charged it professionally.  We still don't know the charge status and how much Freon is in it. I thought it odd that your compressor never cycled during the video, that may have been indicative of an overcharged compressor.    If it is overcharged the compressor works harder (it may not cycle attempting to attain proper pressure) and can deliver warm air when overcharged, see this link > http://www.agcoauto.com/content/news/p2_articleid/155.

These questions remain:

  1. Where is the link to the refurbished compressor, that you asked us about this morning?, I asked this first thing this morning.
  2. Did you tell the AC shop that you have been adding and removing Freon willy-nilly without proper experience and equipment?, and that it might be overcharged or not charged properly at this point?  I assume that they would properly evacuate and charge the system prior to diagnosing problems, but you never know. 
  3. Did the shop evacuate and recharge it with the CORRECT amount of Freon before they diagnosed it handed you a repair estimate?
  4. Does the estimate include repair of the actuator door and air inlet problem?, I asked this yesterday
  5. What parts are included in the estimate of $1400 that they gave you?, I asked this yesterday

You know, it might well be the compressor, but I will tell you that is it NOT clear cut that it is given the facts above.  I believe your compressor is fine and that your actuator at least partially caused the warm air delivery problem and you started messing with the Freon charge and never determined that it was charged correctly.   Even if the charge was corrected, the temperature actuator problem would still deliver warm air if it is stuck on heat.   It was recently so undercharged that the compressor wouldn't start and you added a can and it started.

I (we) did my best to help you and at this point I am out of ideas and suggestions.   You have not relayed back information that convinces me that you are doing the right thing but it is possible that you don't have the information to give.  The compressor may well be your problem, but other questions and problems exist that need resolving before I could say that (proper evac/charge, actuator).   I cross my fingers that you encountered a competent honest mechanic that will understand the circumstances and that he takes care of you. 

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Again  you are totally correct until the part about the noise it can't be notice in the video like if you were in person. the next day after the trip is when the noise started and the hot air came. this whole issue (post) began with noise and hot air I'm sure my inlet doors are a issue I've even put duck tape on my passenger side to block the heat and it was cold on driver side but not always so yea that's also going to come back up after the compressor replacement . The codes were my fault I was to stubborn to check them and didn't make time too until it was to late . My compressor never threw a code which I stated. Again u  guys are awesome and I am grateful for  being able to hear and use your experience . Thank you. 

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OK, $265 for compressor, drier, oil, orifice tube and O-rings, I clicked the first link

Rockauto, has the same less the oil for $163

see it here

http://www.rockauto.com/en/catalog/cadillac,1998,seville,4.6l+v8,1313843,heat+&+air+conditioning,a/c+compressor+&+component+kit,17507

If you want to spend $196, they will sell you a Delphi compressor, drier and orifice tube without the oil or oring kit, see the link above

If you pull the orifice tube and it has debris in it, the condenser should be replace as they can not be flushed.

This does not mean that I think you need a compressor, as I noted, if it is overcharged it will make noise, and you have not determined its charge state.  

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Ok then.  I gave you an alternative place to buy.  Let us know how it turns out

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Used compressor $44 labor $85 orfice tube $1.99 . Started at 7:30 job complete at 2:00 rain delay . Ac blows cold just like it did from day 1 not freezing just cold . Now I can evac and recharge when I have the money until then I'm good. I still need to check the doors all vent are blowing tho. I wonder is that why it's not ice cold . (Problem my Ac compressor was out the front like 6 or 8 bolts had backed out of the compressor and that's were the freon went . No leaks so far wish me luck thanks guys for going thru my pain with me ?. Hope this helps someone else. Ac compressor noise ,hot air blowing . 

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Terrific, glad you got it going

Did you have debris in the orifice tube?

Did you put oil in?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Did you flush the system?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Hopefully you make it through the summer if your lucky. You should have replaced the condenser and flushed the system. But, that's just me..

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It sounds like you might have suffered from Black Death, here is an interesting article on it

http://www.aircondition.com/tech/questions/15/

 

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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