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Thread: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

  1. #1
    eldoradojoe is offline Cadillac Owners Member
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    POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    98 Eldorado,, I was putting in Freon when all the sudden huge pop like a hose blew up followed by the rush of air escaping for about a good half second then silent. The explosion sounded as if it came from under the radiator and from center to driver side. So I look under at the line and hoses I don't seem to find anything blown up. it appears the hoses are sound, pipes good, ends and fittings tight. After a few days I try to find the exit point for the compression blast I heard. I am thinking, ok, It blew so there is obviously nothing in the system and no pressure with a gaping hole somewhere, right... So I loosen the big nut on front side of the drier that line that runs down and under the radiator, well when I pull it off I get a small but startling compression blast with a puff of moisture spray and I shove that baby back in and tighten the nut.....
    Soooo, Is there by chance some kinda pop off valve....... I guess I'm thinkin now I gotta pull a vacuum....


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  3. #2
    rodnok01's Avatar
    rodnok01 is online now Cadillac Owners Master
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    No pop off valve. You probably heard the compressor seals blowing.

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    Aztec ETC ECS's Avatar
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Yes blow off valve. How else would it still have pressure in the system?
    It would take about 500 PSI to blow it.
    How much did you put in?
    Too much will not get cold.

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    Ranger's Avatar
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was



    What where your high side pressures?

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

    I was putting in Freon
    WHY?

    I am thinking, ok,
    It blew so there is obviously nothing in the system
    and no pressure with a gaping hole somewhere, right...
    So I loosen the big nut on front side of the drier

    so - you start disconnecting pressure lines -
    without even checking if there is any pressure in the system -
    BAD - BAD - BAD IDEA -

    Soooo, Is there by chance some kinda pop off valve.
    yes - there is an overpressure relief valve on the compressor -
    that will open if pressures get around 500PSI -

    I guess I'm thinkin now I gotta pull a vacuum....

    FIRST - a couple of questions -

    do you have access to a set of AC gauges?
    I mean a REAL set of gauges -
    not some mickeymouse single gauge on a can -

    do you have access to a vacuum pump -

    do you have any working knowledge of the AC system -

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

    You are in over your head. Time to suck it up and take it to a shop that has the right equipment and knows what they are doing. You probably overcharged it and the low side blew. For starters you'll have to shell out for a new pressure line and a new dryer since you have had the system open to the atmosphere too long. Then there's Freon, oil and so on. Hope that the compressor isn't ruined.

  8. #7
    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,, I have a real set of gauges and a good vacuum pump.
    How do I see if all the parts are still good??

  9. #8
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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,, I have a real set of gauges and a good vacuum pump.
    How do I see if all the parts are still good??
    -----------------------
    connect the gauges - if no pressure -
    connect the vacuum pump - open BOTH HIGH and LOW valves -
    and fire up the vacuum pump -

    if there are no giant holes blown in the system -
    you should see close to 30" of vacuum within 20 minutes or so -

    after 30 minutes or so - close both valves -
    turn the vacuum pump off - and just let it sit for a while -

    IF the system is tight - it will hold the vacuum forever -

    if after an hour - the system is still holding close to 30" of vacuum -
    turn the vacuum pump back on - wait a full minute -
    then open both valves again -
    and let the vacuum pump run for several hours -

    the first vacuum was just a test to see if the system has any leaks -
    what you are doing now is boiling off any moisture in the system -

    after several hours - close the valves -
    shut off - and disconnect the vacuum pump -

    let it sit for another 30 minutes to verify there are no leaks -

    then fill with the correct amount of 134a - I believe 2.2LBS -
    about 3 12oz cans -

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    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, I have pulled a vacuum for 10 min and have good negative readings.
    Closed the valves and after ten minutes I still have the same negative readings.
    SO - is it ok to fill it back up and how much oil and Freon go in??

    ----------

    OK, fixing to do the 2 hours with pump on

  11. #10
    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

    When refilling how much of the pag oil do I need to put in???
    It comes in 3oz cans

  12. #11
    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 pulled vacuum for 3 hours, shut it down for an hour and pressure held.
    Started refilling, I put in 1 12oz can of Freon then one 3oz can of pag oil then one and 3/4 more cans of Freon.
    OK, so the (compressor off, low refrigerant) keeps coming on...
    My sessions are like this,,, First I pull up the diagnostics and clear the acm codes then start the engine, turn on the a/c, run and stick a jumper in the a/s relay to turn on the compressor, then start filling Freon.
    The gauges look fine for about a minute then the (a/c off - low refrigerant) lights up the dash and even though the compressor is jumped and running I see the high side gauge start to rise.... when it hits 350psi I pull the jumper, shut everything down and repeat the process. It took about 20 repeats of above to get everything in.
    So I think there is enough in the system for it to run but when I replace the relay and start up the ac the compressor will not kick on.
    Is there a switch somewhere that mat need replacing or what????

  13. #12
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Clearing the codes will enable the compressor. No need to jumper anything.

    350 psi sounds rather high. What was the low side pressure?

  14. #13
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    I pulled vacuum for 3 hours, shut it down for an hour and pressure held.
    OK that means there are no leaks in the system - GOOD -

    so - WHY were you adding freon to begin with - post #1 -
    when you over-pressured the system -
    and blew the popvalve?

    The gauges look fine for about a minute........
    I see the high side gauge start to rise....
    when it hits 350psi I pull the jumper,
    shut everything down and repeat the process

    unless the ambient temperature is approaching 100* -
    the HIGH pressure reading is WAY TOO HIGH -

    what is the LOW side reading -

  15. #14
    98Geldog is offline Cadillac Owners Fanatic
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    What codes do u have. I had the same problem and was one or the pressure sensors by the fire wall and the orifice tube was pushed in too far and that's wat broke the sensor

    ----------

    Also I had a bad connector for the low side sensor witch stopped the compressor from turning on

  16. #15
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    Re: POP, pshhhhhhhhhWhoooosh is what came out of my A/C lines somewhere while I was

    Quote Originally Posted by 98Geldog View Post
    What codes do u have. I had the same problem and was one or the pressure sensors by the fire wall and the orifice tube was pushed in too far and that's wat broke the sensor

    ----------

    Also I had a bad connector for the low side sensor witch stopped the compressor from turning on
    ----------------------------------------
    the orifice tube was pushed in too far and that's wat broke the sensor
    that was probably a freon temperature sensor -
    not a pressure sensor -


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