and gain access to Reviews and Discussion of the 2016 and 2017 Ford Explorer Tech Tips, How to Articles, Off-Road Modifications and Events, Street Truck Mods and Events, and much more! Since 1996 our community has covered every aspect of the Ford Explorer, Ford Ranger and all vehicles based on this platform.

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

I Charged My AC System Today....Help!!

Discussion in 'Stock 2002 - 2005 Explorers' started by Explorerer, July 30, 2008.

  • Searches ExplorerForum.com
    1. Explorerer

      Explorerer New Member

      Joined:
      July 29, 2008
      Messages:
      13
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Wildwood, Missouri
      Year and Model:
      2003 Limited
      Okay

      Last week I noticed that my air conditioner was putting out barely cool air. So I says to myself, "It must just need a charge." Today I dug out the manifold and gauges. Sure enough it only had about 150 lb on the high side :(, so I proceeded to add the modern marvel 134a. It took about a can and a half.

      The pressure reading at 1200 rpm is 45 / 225. From what I've read that's normal. However, the high side gauge pulses rapidly and if you touch the hose you can feel the corresponding pounding of the compressor. No noise from the compressor though.

      Is this normal on an 03 Explorer? Did I put too much refrigerant in it? Or is it an indication of something else wrong? It's making a lot of cold air. :D :cool: Should I mention that the ambient temp was only 80F today? I know that affects things but I don't remember how.

      Steve
       
    2. Support EF


      Join the Elite Explorers for $20 a year

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



      to hide adverts.
    3. crash594

      crash594 Active Member

      Joined:
      December 29, 2007
      Messages:
      259
      Likes Received:
      0
      Trophy Points:
      0
      Year and Model:
      2005 XLT
      I may be wrong but I think the pressure is a little high for the temp of the day from what I recall. Is the clutch kicking in and out or does it get warm at high way speeds (55 to 70MPH) then I would say it has too much and the high pressure switch is kicking it off.
       
    4. jmorristn

      jmorristn New Member

      Joined:
      May 30, 2007
      Messages:
      33
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      TN
      Year and Model:
      2004 XLT
      my 04 does the same thing, i added some to mine this past weekend at 85 degrees and the high side gauge was pulsating like crazy. you could feel it in the line also. to get a good reading i closed the valve and check the trapped pressure it was about 235-240 and 42 low side. low side was steady.
       
    5. Explorerer

      Explorerer New Member

      Joined:
      July 29, 2008
      Messages:
      13
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Wildwood, Missouri
      Year and Model:
      2003 Limited
      Thanks for the quick responses. :)

      It's supposed to get up into the 90s today. If I get time, I'm going to reconnect the gauges and test it again. I have limited experience with AC systems. I just successfully retrofitted my 90 Saab over to 134a. I dismantled the entire system and thoroughly flushed each component, except the compressor of course. It turned out super good w/lots of cold air. :thumbsup: Before that, I'd never even charged a system. But I do have the Ford factory service manual and if I'm interpreting the graphs correctly, at 80 F normal low/high pressures are 30/185 on the low end of the normal range to 58/270 on the high end of normal pressures. So based on that JMorristn and I are both within specs. However, I'm pretty certain that this rapid pulsing on the high side is not normal. Somebody knows the answer. I'll post it if I find it.
       
    6. tower

      tower Active Member

      Joined:
      April 5, 2005
      Messages:
      528
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Millbury, MA
      Year and Model:
      03 Limited centennial
      All I can tell you is mine does this as-well, and has gotten worse I can feel it in the steering wheel I am thinking a will be needed a new compressor soon. :(
       
    7. Blee1099

      Blee1099 Evil Asian Moderator Emeritus EF Vendor

      Joined:
      March 3, 2002
      Messages:
      14,050
      Likes Received:
      1
      Trophy Points:
      58
      City, State:
      Elkridge, MD
      Year and Model:
      91
      Your levels seem kind of high to be honest for ambient temp of 80.. Your high pressure should be 2.2-2.5x the ambient temperature.. So basically 176-200 psi at 1500 RPM with AC on the highest setting, low pressure should hover around 25-30.. It should never reach 225 PSI on the high side or 45 on the low side. Did you by chance pull a vacuum before recharging the system?
       
    8. Explorerer

      Explorerer New Member

      Joined:
      July 29, 2008
      Messages:
      13
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Wildwood, Missouri
      Year and Model:
      2003 Limited
      I think you're right. I added too much refrigerant.:salute:

      I didn't pull a vacuum because the system still had 150 psi on the high side and was making a small amount of cold air. My understanding is that unless the system is compromised by opening it to the atmosphere (changing a component or major leak) evacuation isn't necessary. Is that right?

      I'm going to bleed off some of the refrigerant. Let's see...billions of dollars have been spent by the automotive industry and passed on to the consumer to change over to 134a because it's not harmful to the environment right? :rolleyes:
       
    9. crash594

      crash594 Active Member

      Joined:
      December 29, 2007
      Messages:
      259
      Likes Received:
      0
      Trophy Points:
      0
      Year and Model:
      2005 XLT
      you are correct
       
    10. Explorerer

      Explorerer New Member

      Joined:
      July 29, 2008
      Messages:
      13
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Wildwood, Missouri
      Year and Model:
      2003 Limited
      Regarding the rapidly fluctuating reading on the high side pressure gauge, I found this in the Ford Factory Manual:

      NOTE: Vehicles equipped with Visteon fixed scroll A/C compressors may experience rapid refrigerant high side pressure fluctuations upon cold startups and/or after refrigerant system recharges. These high side refrigerant fluctuations are characteristic of the Visteon fixed scroll compressor and not an indication of a failing/failed A/C compressor.

      The Visteon SC115 A/C compressor has the following characteristics:
      • Tangential mount design—three lugs.
      • The single manifold block of the compressor manifold and tube assembly fits to the suction and discharge ports. Two O-ring seals are used for sealing.
      • An eccentric bushing is driven by the shaft of the A/C compressor.
      • An orbiting scroll driven by the eccentric bushing compresses the refrigerant gas against the walls of the fixed scroll.
      • Single reed-type discharge valve mounted on the back of the fixed scroll. There are no suction valves.
      • Non-serviceable shaft seal fully supported on both sides by bearings.
      • The A/C compressor uses PAG oil or equivalent. This oil contains special additives required for the A/C compressor.
      • The A/C compressor oil from vehicles equipped with an Visteon SC115 A/C compressor may have some slightly dark-colored streaks while maintaining normal oil viscosity. This is normal for this A/C compressor because of break-in wear of the scroll seals that can discolor the oil.
      • Use standard oil matching procedures when installing new compressors.

      So, apparently the rapid fluctuations are normal after charging a system with the Visteon compressor. I haven't checked yet to confirm that's the compressor I have, but I'd bet on it.

      Tomorrow I'm going to tinker with it some more. I'm hoping that when I put the gauges on tomorrow that the system is stablelized and I can get an accurate high side reading. I was using the center of the fluctuation sweep to determine my reading. But the high end of the fluctuation may be the actual pressure.
       
    11. Baileybc

      Baileybc New Member

      Joined:
      December 2, 2004
      Messages:
      19
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Bend Oregon
      Year and Model:
      '97 XLT
      Please post procedure for R-134a recharge

      My AC fails to cool on the 11 year old Explorer XLT. What is the procedure for recharging? I presume the low side is the fitting by the radiator and the high side is the compressor reservoir side.
       
    12. Baileybc

      Baileybc New Member

      Joined:
      December 2, 2004
      Messages:
      19
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Bend Oregon
      Year and Model:
      '97 XLT
      Blend door Actuator Issue

      Well, I removed the four screws securing the AC module to the dash and cleaned the 11 years of Central Oregon dirt from the rear. In the process, I remembered that the Exploder service guy mentioned the blend door, and that is why his tech lashed the door closed in summer season, requiring my opening in the winter season. What can be done to repair this blend door actuator? I figure that the variable temp control in the center of the module controls the degree to which the door opens, ie. the amount of hot air. Somehow, when AC Max was selected, the door stayed closed by itself.

      I am recharging the system this afternoon and will run AC Max until resolving gthe blend door actuator issue.
       

    Share This Page






    We Support Our Troops!