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ac compressor short cycling...Low freon or is it another problem?

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  • ac compressor short cycling...Low freon or is it another problem?

    Hey everyone...Compressor wasn't cycling at all so added a little freon and started to short cycle...Off for about 8 seconds and on for 2. Gauge on store bought freon kit says about 45 psi when off and about 23 psi when on...the 45 psi is in range of outside temperture. Is it a good idea to keep adding 134 till the compressor runs constant? As always thanks for the help. Al. Oh crap..Almost forgot....temperture also stays constant through the band from 60 till 85..Then at 90...Bam...Full bore heat....Tried the gray arm,no movement...Am I in for a blend door job?

  • #2
    You may still need more, but don't keep adding refrigerant indefinatly. The system only holds a specific amount. Over filling is very bad. Manual for a 98 states 34 ounces so don't add more than that. If the system was completly empty you might need more than 1 can. The 98 specs state 40-47psi when the cycling switch is closed and 22-28 when it is open.

    Best thing is to have the system properly recharged. A critical step is completly evacuating the system and doing a leak test. Many places will not charge you if they detect a leak. Of course, it is much more expensive than 2 cans.
    98 LSC Torreador Red
    "This fire's thrills per BTU are off the charts!"

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    • #3
      Thank you much...I only dropped in a bit to get it to cycle..just didn't expect a short cycle. The can I'm using is 24 oz. Will post results later.

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      • #4
        If it was ow and not cycling you could probably put tha whole can in or at least untill it seems to cycle correctly.
        98 LSC Torreador Red
        "This fire's thrills per BTU are off the charts!"

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        • #5
          To confirm it's cycling on low pressure you can jump out the low pressure switch on the accumulator. It's a 2 wire plug, just unplug it from the sensor and jump the pins in the connector. If the compressor stays on it needs more freon.
          -Bryan-
          1998 Mark VIII LSC - 1990 Thunderbird SC 5spd - 2005 Explorer Limited 4.6L - 1995 Taurus LX 3.8L - 2003 Taurus SEL 24V - 2008 Honda VFR 800

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          • #6
            just to update

            First of all,thanks so much for the help. I've put 24oz in an ac has gotten colder and compressor is running well. But as I stated in the OP the temp still stays constant throygh the band from 60 till 85....Then I hit 90 and whammo...Full on heat. From all I've read,this doesn't sound like a blend door issue as I have both ends of the band.....If I'm mistaken please correct me.

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            • #7
              Don't go over 85!
              Bud Pytko
              2015 Lincoln MKZ Hybrid
              2005 Ford F250 6.0 PSD CC 4X4 LB
              2007 Arctic Fox 30' 5th Wheel

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              • #8
                Originally posted by Marked_Man View Post
                But as I stated in the OP the temp still stays constant throygh the band from 60 till 85....Then I hit 90 and whammo...Full on heat. From all I've read,this doesn't sound like a blend door issue as I have both ends of the band.....If I'm mistaken please correct me.
                Wait, maybe I don't understand. Are you saying the output temp stays the same (presumably cold?) regardless of the setting unless it's set to 90?

                Have you tried the EATC self test?
                JP

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                • #9
                  Originally posted by driller View Post
                  Wait, maybe I don't understand. Are you saying the output temp stays the same (presumably cold?) regardless of the setting unless it's set to 90?

                  Have you tried the EATC self test?
                  You've read me right Drillman.... stays constant cool till 90.then its the tropics. Sounds like I've got a new issue..Maybe I'll have a sticky named after me. :-)

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                  • #10
                    Try to see if you get any codes...

                    Electronic Automatic Temperature Control Module Self-Test

                    The EATC module self-test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A NGS tester must be used to retrieve these concerns.

                    The EATC module self-test will detect concerns in the system control functions and will display hard diagnostic trouble codes (DTC) in addition to intermittent diagnostic trouble codes for concerns that occur during system operation. The vehicle interior temperature should be between 4°-32°C (40-90°F) when performing the self-test. If the temperatures are not within the specified ranges, false in-car temperature sensor DTCs will be displayed.

                    The self-test can be initiated at any time. Normal operation of the system stops when the self-test is activated.

                    To enter the self-test, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed.

                    If any DTCs appear during the self-test, follow the diagnostics procedure given under ACTION for each DTC given.

                    If a condition exists but no DTCs appear during the self-test, refer to the Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Improper Operation.

                    To exit self-test and retain all intermittent DTCs, push the blue (cooler) button. The control will exit self-test, retain all intermittent diagnostic trouble codes and then turn OFF (display blank).

                    To exit self-test and clear all diagnostic trouble codes, press the DEFROST button. The vacuum fluorescent display window will show 888 and all function symbols for one second. Then, the EATC control assembly will turn OFF (display blank) and all DTCs will be cleared.

                    Always exit the self-test before powering the system down (system turned OFF).
                    JP

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                    • #11
                      When I ran the test I watched and had my fingers on the gray arm...It didn't move more tgan a 1/4 inch....I'm going to assume it should move mlre than that.

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                      • #12
                        Perhaps I'm misreading, but this almost sounds like it could be intended operation. Is it possible that the EATC is programmed in such a way that when the user selects 90 degrees, what they really get is "as hot as possible?"

                        It seems to work that way on the other end anyway.. Set it to 60, and the AC will run all day long.

                        anywhere in between, and it pulls data from a cabin temperature sensor modulating the heat/cool air to achieve the requested temperature..

                        I always figured this was Ford's answer to the folks who wanted instant gratification by requesting one extreme or the other to "make it heat (or cool) faster"

                        I could say "girlfriend mode" but I won't.
                        Mike Martin

                        1997 Mark VIII LSC 5.0
                        2001 Dodge Dakota

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                        • #13
                          Both of my Gen 2's are similar. The compressors don't short cycle, but it's ice cold until I reach about 78, then it starts to warm a bit, but it's not full heat at 80, it gets hotter as I go up from there. This is in manual operation.

                          The Gen 1 system works much better.

                          Bill
                          1994 Deep Jewel Green 183,142 miles
                          1997 White LSC 135k miles
                          1998 White Collectors Edition 175k
                          1994 Black (#2) 100k miles
                          1993 Deep Jewel Green Convertible

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                          • #14
                            I think I've posted a problem for the ages.

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                            • #15
                              just keep it set to 60.
                              98 LSC Torreador Red
                              "This fire's thrills per BTU are off the charts!"

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