Dismiss Notice



Register Today It's free! This box will disappear once registered!

AC making weird noise

Discussion in 'Stock 1995 - 2001 Explorers' started by Georgia_Birdman, October 11, 2018.

^^Searches ExplorerForum.com^^





  1. Georgia_Birdman

    Georgia_Birdman New Member

    Joined:
    April 29, 2017
    Messages:
    46
    Likes Received:
    1
    Trophy Points:
    18
    City, State:
    Marietta, GA
    Year, Model & Trim Level:
    1998 Explorer Eddie Bauer
    When I first turn on my AC after my engine hasn't been running for a while, it makes a weird rumbling noise. It sounds like, "grrrunk grunk". It is two or three short bursts, then it doesn't do it anymore. It won't do it if I turn the AC off and back on. It only does it after the engine hasn't ran in a while. BTW, I did add refrigerant a couple of weeks ago. The pressure is around 45 psi. Any ideas?
     
  2. Support EF

    Join the Elite Explorers for $20

    Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see practically no ads, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create more private Conversations, and more. Join Today. Your support is greatly appreciated.


  3. XLTrunner

    XLTrunner Active Member

    Joined:
    April 19, 2015
    Messages:
    656
    Likes Received:
    60
    Trophy Points:
    38
    City, State:
    MN
    Year, Model & Trim Level:
    1998 Explorer XLT 4.0SOHC
    My guess is your bearing is on it's way out.
     
  4. Georgia_Birdman

    Georgia_Birdman New Member

    Joined:
    April 29, 2017
    Messages:
    46
    Likes Received:
    1
    Trophy Points:
    18
    City, State:
    Marietta, GA
    Year, Model & Trim Level:
    1998 Explorer Eddie Bauer
    Doesn't sound like a bearing. I am wondering if I overcharged the system.
     
  5. koda2000

    koda2000 Explorer Addict

    Joined:
    September 2, 2011
    Messages:
    12,654
    Likes Received:
    970
    Trophy Points:
    143
    Year, Model & Trim Level:
    x
    Around 30 PSI on the low side sounds more normal to me. It might be overcharged.
     
  6. Georgia_Birdman

    Georgia_Birdman New Member

    Joined:
    April 29, 2017
    Messages:
    46
    Likes Received:
    1
    Trophy Points:
    18
    City, State:
    Marietta, GA
    Year, Model & Trim Level:
    1998 Explorer Eddie Bauer
    Also, there is a small port behind the compressor. When I turned on the AC yesterday morning, a small puff of mist came out of this hole at the same time the noise was going on. BTW, what is that hole for?

    Dscf1337b.jpg
     
  7. BKennedy

    BKennedy Elite Loser Staff Member Moderator Elite Explorer

    Joined:
    November 29, 2000
    Messages:
    6,383
    Likes Received:
    603
    Trophy Points:
    133
    Location:
    USA
    City, State:
    San Diego, PRofK
    Year, Model & Trim Level:
    1994 XLT
    I think that is the pressure relief valve, so maybe you have too much pressure in the system.
     
    • Like Like x 1
  8. koda2000

    koda2000 Explorer Addict

    Joined:
    September 2, 2011
    Messages:
    12,654
    Likes Received:
    970
    Trophy Points:
    143
    Year, Model & Trim Level:
    x
    I'm not aware that Ford ever put a relief valve on the A/C system (I could be wrong). Could that be the lower part of the high pressure switch? That's where the high pressure switch is located on my 01 Sport Trac. I know because the previous owner broke the top off the switch while changing the #4 spark plug. I was able to find the top to the switch shoved in a hole on the frame and I glued it back on. Mine didn't even work without the top on the switch. Maybe your's is jumped?

    I'd drop the low side pressure to around 30-32 PSI and see if that stops your noise.
     
    Last edited: October 12, 2018
    • Like Like x 1
  9. 974X4BLACKSPORT

    974X4BLACKSPORT Active Member

    Joined:
    May 21, 2018
    Messages:
    707
    Likes Received:
    144
    Trophy Points:
    53
    Location:
    FL
    City, State:
    hudson
    Year, Model & Trim Level:
    BLACK 1997 SPORT 4 BY 4
    Put gauges on the a/c and check the high and low side.
     
  10. BKennedy

    BKennedy Elite Loser Staff Member Moderator Elite Explorer

    Joined:
    November 29, 2000
    Messages:
    6,383
    Likes Received:
    603
    Trophy Points:
    133
    Location:
    USA
    City, State:
    San Diego, PRofK
    Year, Model & Trim Level:
    1994 XLT
    I know my 1994 has a pressure relief valve. It blew when I was over 9,000 feet up in the Sierra's after some AC work was done a few weeks prior. I thought something in the cooling system blew, but when I went to look, that brass thingy was covered with green AC oil. It still ran cool after that so I figured it was over-pressured due to the recent service and altitude.
     
  11. donalds

    donalds Elite Explorer

    Joined:
    July 12, 2015
    Messages:
    1,455
    Likes Received:
    312
    Trophy Points:
    103
    Location:
    Stem
    City, State:
    Nc
    Year, Model & Trim Level:
    1999 ford explorer sohc
    Pressure release valve I had to replace this on my 99 cheep fix
    Sounds like overcharge of the system
    Mine rides at about 28 when the compressor is on
    Also the a.c. clutch will sound funny when you let it sit it gets a little bit of surface rust on the clutch material that will rub off when it cycles a few times
     
  12. Georgia_Birdman

    Georgia_Birdman New Member

    Joined:
    April 29, 2017
    Messages:
    46
    Likes Received:
    1
    Trophy Points:
    18
    City, State:
    Marietta, GA
    Year, Model & Trim Level:
    1998 Explorer Eddie Bauer
    It is around 35 psi with an outside temperature of 75 degrees. I may need to have the system evacuated and recharged. I am going to take it to my mechanic next week. I just wanted to get a few opinions. Thanks for all your help.
     
  13. Georgia_Birdman

    Georgia_Birdman New Member

    Joined:
    April 29, 2017
    Messages:
    46
    Likes Received:
    1
    Trophy Points:
    18
    City, State:
    Marietta, GA
    Year, Model & Trim Level:
    1998 Explorer Eddie Bauer
    According to my mechanic, I didn't dodge a bullet, I dodged a missile. I seriously overcharged the system. According to the vehicle specs, the system is only supposed to be charged to 1 lb, 14 oz. I had 4 lbs in it. Luckily the relief valve saved me and nothing was damaged. He evacuated and recharged the system. Everything is good now. I just made a stupid mistake which was almost a costly one. His advice and now mine is don't trust those cheap guages on the recharge kits. Let someone who knows what they are doing maintain your account system. I will admit that I am not qualified for this.
     

Share This Page







We Support Our Troops!