AC system overcharged?
Thread Starter
Racer
Joined: Mar 2012
Posts: 420
Likes: 9
From: Bow New Hampshire
AC system overcharged?
If an AC system has been overcharged will the compressor make any noise? It's cooling properly but I am getting a howling noise under acceleration. No unusual sounds otherwise.
Thanks
Thanks
Race Director
Joined: Dec 2013
Posts: 12,505
Likes: 3,634
Chances are it either the pulley tension bearing on the way out on the A/C side down at the bottom of the engine for that belt system, or your bearing in the A/C compressor that is going south instead.
If you remove the main belt, and then the main belt tensioner pulley (just the pulley via it center bolt, not the entire tensioner off the front of the motor), this will allow you to reach straight down to the bottom of the motor to take the pressure off the A/C tensioner on the belt, and then spin the pulley off the tension to check and re-grease both pulley bearings. Also, with the main belt off, this allows you to reach under the air intake to remove the idler pulley to re-grease it as well.
Also, take a look at the condition of both belts, and if needed since the main belt is loose, you can replace both belts.
Thread Starter
Racer
Joined: Mar 2012
Posts: 420
Likes: 9
From: Bow New Hampshire
AC has a pressure sensor on it, and when over charged, it will kick the system out instead (freon heating up will cause over pressure).
Chances are it either the pulley tension bearing on the way out on the A/C side down at the bottom of the engine for that belt system, or your bearing in the A/C compressor that is going south instead.
If you remove the main belt, and then the main belt tensioner pulley (just the pulley via it center bolt, not the entire tensioner off the front of the motor), this will allow you to reach straight down to the bottom of the motor to take the pressure off the A/C tensioner on the belt, and then spin the pulley off the tension to check and re-grease both pulley bearings. Also, with the main belt off, this allows you to reach under the air intake to remove the idler pulley to re-grease it as well.
Also, take a look at the condition of both belts, and if needed since the main belt is loose, you can replace both belts.
https://youtu.be/fmb_eMpvidc
Chances are it either the pulley tension bearing on the way out on the A/C side down at the bottom of the engine for that belt system, or your bearing in the A/C compressor that is going south instead.
If you remove the main belt, and then the main belt tensioner pulley (just the pulley via it center bolt, not the entire tensioner off the front of the motor), this will allow you to reach straight down to the bottom of the motor to take the pressure off the A/C tensioner on the belt, and then spin the pulley off the tension to check and re-grease both pulley bearings. Also, with the main belt off, this allows you to reach under the air intake to remove the idler pulley to re-grease it as well.
Also, take a look at the condition of both belts, and if needed since the main belt is loose, you can replace both belts.
https://youtu.be/fmb_eMpvidc
Race Director
Joined: Dec 2013
Posts: 12,505
Likes: 3,634
Could be the Harmonic balancer on the way out, or even the A/C clutch giving up the ghost.
Unplug the electrical connector from the AC compressor so the A/C clutch does not engage, and see if it still making the same noise during acceleration.
Bottom left just behind the A/c pulley,with the black connector that plugs into the white socket.
Unplug the electrical connector from the AC compressor so the A/C clutch does not engage, and see if it still making the same noise during acceleration.
Bottom left just behind the A/c pulley,with the black connector that plugs into the white socket.
Last edited by Dano523; Mar 27, 2016 at 06:32 PM.
Thread Starter
Racer
Joined: Mar 2012
Posts: 420
Likes: 9
From: Bow New Hampshire
Could be the Harmonic balancer on the way out, or even the A/C clutch giving up the ghost.
Unplug the electrical connector from the AC compressor so the A/C clutch does not engage, and see if it still making the same noise during acceleration.
Bottom left just behind the A/c pulley,with the black connector that plugs into the white socket.
Unplug the electrical connector from the AC compressor so the A/C clutch does not engage, and see if it still making the same noise during acceleration.
Bottom left just behind the A/c pulley,with the black connector that plugs into the white socket.
Thanks
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
From personal experience if it does end up being the clutch I'd consider replacing the whole compressor anyways. I replaced just the clutch on mine and now a year later I need to replace the compressor, so I would have been better off just doing the whole thing to begin with.
Thread Starter
Racer
Joined: Mar 2012
Posts: 420
Likes: 9
From: Bow New Hampshire
From personal experience if it does end up being the clutch I'd consider replacing the whole compressor anyways. I replaced just the clutch on mine and now a year later I need to replace the compressor, so I would have been better off just doing the whole thing to begin with.
