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Northstar Engines and System Technical Discussion Discussion, A/C Question in Cadillac Engine Technical Discussion; Sorry to be a PITA, but I have a small question about the AC compressor... I started to put some ...
  1. #1
    2004Eldorado is offline Cadillac Owners Member
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    A/C Question

    Sorry to be a PITA, but I have a small question about the AC compressor...
    I started to put some R134a in the high side, and the gauge hit 40 then the compressor kicked in and it dropped to 10. The compressor went off, the pressure rose again and the AC kicked in around 13 this time. Even though the gauge hit 40 psi when filing, when the AC came on, it dropped significantly.

    Is it safe to add more R134, assuming that this is why the AC wasn't kicking in at all when I got the car, or is the rise and fall of pressure something else?

    I have to put my hand up here and say I grew up where cars didn't have AC. They had lots of other gadgets, but no AC.

    Thanks for your help everyone
    Darryl

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: A/C Question

    I am sure that you did not add it to the high side. The high side fitting is a different size to prevent you from doing that because the can would become a hand grenade. Rising and falling pressures are normal as the compressor engages and disengages. Those pressures are not. How much is in there now?

  4. #3
    2004Eldorado is offline Cadillac Owners Member
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    Re: A/C Question

    LOL!! I meant the "low" side

    Now, the pressure is around pounds when I put a gauge on it...it's just that when I pull the trigger to add the 134 it rises to 40 before the compressor kicks.
    When the compressor clutch engages it's 13.

  5. #4
    2004Eldorado is offline Cadillac Owners Member
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    Re: A/C Question

    around 13 pounds until I try to add more, the squezing the trigger makes it go as high as 40 till the compressor clutch engages.

    correction

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: A/C Question

    Might be a bad compressor. Pressures should rise when the compressor engages.

  7. #6
    zonie77 is offline Cadillac Owners Connoisseur
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    Re: A/C Question

    When the system is at rest the pressure is the same throughout. When the compressor is turned on (clutch engages) the low side drops and the high side rises. When it stops the pressure equalizes.

    Your pressures sound normal for a very low charge. It should be somewhere over 100psi at rest. Going to 30 low and 200 high (rough estimates).

    Look around at some of the AC websites. They give a nice explanation of how AC works, which is really pretty simple. (It's all simple when you understand it!)

  8. #7
    2004Eldorado is offline Cadillac Owners Member
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    Re: A/C Question

    Thanks. The AC kicked in eventually after adding more but the clutch burned up, so it's AC replacement time I guess. Not the end of the world.

  9. #8
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: A/C Question

    If the compressor is OK, the clutch is serviceable separately.

  10. #9
    zonie77 is offline Cadillac Owners Connoisseur
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    Re: A/C Question

    Quote Originally Posted by Ranger;
    If the compressor is OK, the clutch is serviceable separately.

    Right! and you shouldn't lose the charge just changing the clutch.

  11. #10
    2004Eldorado is offline Cadillac Owners Member
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    Re: A/C Question

    The shop says that the compressor/clutch and receiver/drier need to be replaced $275 parts cost. I checked online and $230 seems to be the lowest I can find the parts for, so doesn't sound too outlandish?

  12. #11
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: A/C Question

    That actually seems too cheap for those parts. A/C Delco?

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