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Cadillac Seville / Cadillac Eldorado Forum Discussion, POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was in Past Cadillac Vehicle Discussion; UPDATE- After vacuum and then installing one 3oz can oil and two and a half 12oz cans of Freon the ...
  1. #16
    eldoradojoe is offline Cadillac Owners Member
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    UPDATE-
    After vacuum and then installing one 3oz can oil and two and a half 12oz cans of Freon the compressor does not come on without jumping it. My current pressures with a/c on but no compressor engaged are high side 125 and low side about 135. codes that come up are ACM B1348 and PZM B 2470

    ----------

    I was adding Freon before all this happened because the computer said (low refrigerant) .
    Right now if you jump the compressor the readings are High 250 and Low 47. when the dash lights up (a/c off low refrigerant) the high and low start to rise even though the compressor is still jumped on....

  2. #17
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Quote Originally Posted by eldoradojoe View Post
    UPDATE-
    After vacuum and then installing one 3oz can oil and two and a half 12oz cans of Freon the compressor does not come on without jumping it. My current pressures with a/c on but no compressor engaged are high side 125 and low side about 135. codes that come up are ACM B1348 and PZM B 2470

    ----------

    I was adding Freon before all this happened because the computer said (low refrigerant) .
    Right now if you jump the compressor the readings are High 250 and Low 47. when the dash lights up (a/c off low refrigerant) the high and low start to rise even though the compressor is still jumped on....
    ------------------------------------
    My current pressures with a/c on but no compressor engaged
    are high side 125 and low side about 135.

    that is STATIC PRESSURE - and means NOTHING -
    other than there is some amount of freon in the system -
    ---------------

    as Ranger said - you should NOT need to jumper anything
    to have the AC work -

    however - the compressor WILL NOT engage
    IF there is a low pressure fault code -

    if you were - and are still getting a LOW REFRIGERANT code -

    and with the use of ACCURATE pressure gauges
    you have determined that the refrigerant is NOT low -
    you MUST have a defective LOW PRESSURE SWITCH -

    Right now if you jump the compressor
    the readings are High 250 and Low 47

    unless the ambient temperature is close to 100* -
    BOTH HIGH and LOW pressure readings are too high -

    what is the outside - ambient - air temperature -

    what is the temperature of the discharge air -
    at the center vent -

    with temp set to 60* -

    and blower on a medium speed -

  3. #18
    eldoradojoe is offline Cadillac Owners Member
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Temp outside is a blistering Texas 100 degrees.
    With the compressor jumped the air at the vent is good and cold

    ----------

    where is the low pressure switch located?? I will go buy one and replace it

  4. #19
    basscatt's Avatar
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Quote Originally Posted by eldoradojoe View Post
    Temp outside is a blistering Texas 100 degrees.
    With the compressor jumped the air at the vent is good and cold

    ----------

    where is the low pressure switch located?? I will go buy one and replace it
    -------------------------------
    Temp outside is a blistering Texas 100 degrees.
    well - in that case - your pressures are right on the money -

    where is the low pressure switch located??
    real close to the low side service port -


    ACDELCO 152876

  5. #20
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Quote Originally Posted by eldoradojoe View Post
    UPDATE-
    After vacuum and then installing one 3oz can oil and two and a half 12oz cans of Freon the compressor does not come on without jumping it. My current pressures with a/c on but no compressor engaged are high side 125 and low side about 135. codes that come up are ACM B1348 and PZM B 2470
    With no compressor running the static pressures should be the same. That said, those are too high. I think a fully charged system has around 70 psi static pressure on both sides.

    I was adding Freon before all this happened because the computer said (low refrigerant) .
    Right now if you jump the compressor the readings are High 250 and Low 47.
    Low side seems rather high.

    Quote Originally Posted by eldoradojoe View Post
    where is the low pressure switch located?? I will go buy one and replace it
    #4

    http://www.gmpartsgiant.com/Page_Pro...X=2&SortKey=30

  6. #21
    eldoradojoe is offline Cadillac Owners Member
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Basscatt and Ranger, thanks for your help.
    I will pick up a low pressure switch tomorrow and see what happens.....

    ----------

    Hey Basscatt, different subject,,
    My roommate has a 95 Eldorado and just replaced the struts and shocks. they are aftermarket but said to install and plug right in like the originals. Well after a month these baby's are still a rock solid ride, it is horrible!! Is there any way to ease up on the air pressure or something to make the ride softer??

  7. #22
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    Quote Originally Posted by eldoradojoe View Post
    Basscatt and Ranger, thanks for your help.
    I will pick up a low pressure switch tomorrow and see what happens.....

    ----------

    Hey Basscatt, different subject,,
    My roommate has a 95 Eldorado and just replaced the struts and shocks. they are aftermarket but said to install and plug right in like the originals. Well after a month these baby's are still a rock solid ride, it is horrible!! Is there any way to ease up on the air pressure or something to make the ride softer??
    Yea, get OEM $hock$ and $trut$

  8. #23
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Quote Originally Posted by eldoradojoe View Post
    Is there any way to ease up on the air pressure or something to make the ride softer??
    Nope, It's the nature of the beast.

  9. #24
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Quote Originally Posted by eldoradojoe View Post
    Basscatt and Ranger, thanks for your help.
    I will pick up a low pressure switch tomorrow and see what happens.....

    ----------

    Hey Basscatt, different subject,,
    My roommate has a 95 Eldorado and just replaced the struts and shocks. they are aftermarket but said to install and plug right in like the originals. Well after a month these baby's are still a rock solid ride, it is horrible!! Is there any way to ease up on the air pressure or something to make the ride softer??
    --------------------------
    Hey Basscatt, different subject,,
    let me guess - he got arnott - or gabriel - or something other than Monroe -

    unfortunately - that's probably how it's going to ride -

    UNLESS the rear ELC is malfunctioning -
    and have inflated the rear shocks and won't deflate them -
    you can easily tell if the rear end is sticking up really high -

    or the struts/shocks are defective -

    what brand did he get?

  10. #25
    eldoradojoe is offline Cadillac Owners Member
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    OK so I installed a new low pressure switch and the a/c came right on and blew cold for a minute then went warm for a min then cold then warm..... it seems the compressor is going on and off...
    I checked and the high side is about 49psi with temp at 100 degrees here. I cant believe it needs more Freon with three 12oz cans and one 3oz can of oil in there now... so maybe too much????
    I don't know the low side reading cause had to give back the gages but when you turn a/c off high side goes to 105psi

  11. #26
    basscatt's Avatar
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Quote Originally Posted by eldoradojoe View Post
    OK so I installed a new low pressure switch and the a/c came right on and blew cold for a minute then went warm for a min then cold then warm..... it seems the compressor is going on and off...
    I checked and the high side is about 49psi with temp at 100 degrees here. I cant believe it needs more Freon with three 12oz cans and one 3oz can of oil in there now... so maybe too much????
    I don't know the low side reading cause had to give back the gages but when you turn a/c off high side goes to 105psi
    ------------------------------------------------
    DO NOT ADD ANYTHING WITHOUT KNOWING WHAT THE PRESSURES ARE -

    I checked and the high side is about 49psi with temp at 100 degrees here
    you probably mean LOW SIDE -

    and 49 on the LOW SIDE is actually pretty high -
    even taking into account ambient temp of 100* -

    the compressor is CYCLING for a reason -
    now we have to figure out WHY -

    YES - if the system was LOW on freon -
    the compressor would cycle - to protect the compressor -
    freon carries the oil to lubricate the compressor pistons -
    lack of oil will destroy the compressor -

    likewise - if the HIGH SIDE pressure was too high -
    the compressor would cycle - to protect the system -


    likewise there are freon temperature sensors in the system -
    if the liquid freon gets too hot - it can't transfer heat -
    so the system shuts down the compressor so the liquid freon can cool off -

    check for codes -

    connect a FULL SET OF GAUGES -
    we need BOTH HIGH AND LOW readings -

    -----------------
    HIGH pressure switch is #29 on Ranger's illustration -
    Refrigerant Temperature sensor is #14 -

    if either of these switches are bad - it could cause the cycling -
    ----------------------------

    DO NOT JUMP - OR BYPASS ANY SAFETY SWITCHES -
    TO FORCE THE COMPRESSOR TO ENGAGE -
    YOU WILL DAMAGE SOMETHING -

  12. #27
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Quote Originally Posted by eldoradojoe View Post
    I cant believe it needs more Freon with three 12oz cans and one 3oz can of oil in there now.
    Volume wise you are right where you should be.
    The system holds 2.2 lbs. (35.2 oz.)
    You put in three 12 oz. cans (36 oz.)

  13. #28
    eldoradojoe is offline Cadillac Owners Member
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    UPDATE - after installing 48oz of Freon and 3oz oil the low pressure seems to hold at 47-48psi when idling and drops to 43-44 when revved to 2000rpm then back up at idle. its about 100 degrees outside. high pressure around 200psi. I replaced the low pressure switch which did fix the compressor to come on but it is still cycling on and off like 1 minute on and 2 min off and repeat. So if I have 48oz Freon in (my dryer says 2lbs on the label) then it must be full so what else can I check

  14. #29
    basscatt's Avatar
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Quote Originally Posted by eldoradojoe View Post
    UPDATE - after installing 48oz of Freon and 3oz oil the low pressure seems to hold at 47-48psi when idling and drops to 43-44 when revved to 2000rpm then back up at idle. its about 100 degrees outside. high pressure around 200psi. I replaced the low pressure switch which did fix the compressor to come on but it is still cycling on and off like 1 minute on and 2 min off and repeat. So if I have 48oz Freon in (my dryer says 2lbs on the label) then it must be full so what else can I check
    ------------------
    so what else can I check

    go back and read #26 -

    and recheck for codes -

  15. #30
    eldoradojoe is offline Cadillac Owners Member
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    UPDATE- - I had a gauge hooked up to the low side. the ones that hook straight to a can of Freon with a trigger. there was no can hooked to it because I was only checking pressure. My friend who was (helping me) was holding the gauge and pulled the trigger two times and I heard the rush of air.
    So I am wondering - Did Freon come out or did outside air go in????

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