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2007 Buick Rendezvous

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    2007 Buick Rendezvous

    Greetings, I am writing because I need your help. I bought my wife a Buick Ren ... 2007 in very good condition, but they had changed the air conditioning compressor but they did not change anything else, so the system got dirty. I worked part time in a mechanics workshop so I bought the condenser (autozone) and it came with the dryer, when we took out the compressor it had metal particles, so I bought the compressor (remanufactured, in O'reilly). We put acid and cleaned the evaporator until everything came out clean. We installed everything and the mechanic put freon and started to cool. I went to my house to look for my wife and suddenly I stopped cooling. I went to the workshop and they checked the pressures and everything was apparently fine. I decided to buy the expansion valve and the system was reloaded. the problem is that it only cools when the car is running or accelerating, but in low revolutions it does not cool. today i buy autozone gauges to see the pressures and when it is at low revs, the low pressure side goes up to some 60 to 70 psi and the high pressure to 150.when accelerate to 2000 rpm and the low pressure goes away 10 psi and the high pressure side 200 psi. any ideas?

    The original failure was already throwing debris destined not to last then.
    There are VERY important procedures for just doing that and if debris how to flush out where it's likely to be. Acid? What and how was that done dare I ask?

    Condensers are so fine they will be repeatedly ruined are essentially a filter.

    OK, to save the total novel again just some failure points:
    Remanufactured compressors have a terrible failure rate.
    Trouble in general with A/C repair after a failure is when not right it will fail all over again and again need all the same things, the parts that move are not forgiving nor downstream parts always going to clear out definitely NOT acid was for brass and copper radiators if you are thinking that or trying that. NO. Alloys don't tolerate that.

    At the look now you are set back to or soon will be yet another catastrophic compressor failure, debris all over again.

    Understood you want to do this yourself - people in general frequently want to and possible save a buck know the shocking costs.

    Decision time IMO to get super serious about learning A/C AND have equipment to do it or leave it to the trade it is separate trade from the mechanics of the vehicle but is involved to know at least basics of each so you don't wreck more than just what you want to fix. So how far do you wish to go?

    MetroWest, Boston