Question about 2009 Buick Enclave

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AC is not blowing COLD air. There is an ond and off hissing sound from the center of the dash. I can hear and see the compressor clutch engaging and disengaging. I put a gauge on the freon low pressure side and it goes up and down as the compressor cycles. Using an infrared thermometer gun I tested the vents. When it was 90+ outside the vents were blowing 80 on recirculate & full max cold. When I shut down the cold the air from the vents shot up to 115. I checked later in the day when it was cooler. It was about 75 outside and the vents were blowing 50. So what we have for sure is a system that DOES cool the air is also making a lot of noise inside the car... and a compressor clutch that cycles. I'm buying a high/low ac manifold gauge today. But ahead of that purchase does this sound more LOW freon related..... or THERMAL EXPANSION VALVE.... or something else.

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We have had the same problem with our 2012 Buick Enclave ever since we purchased it. I now know a lot more now than back then. I should have been more persistent during the first two years of owing the vehicle (which we feel is a lemon). We can not go through an entire summer without having our AC working. Our Buick Enclave will not hold freon in our system for more than 8 months at a time, not matter what they do. We have had our entire front AC system replaced (under warranty) a new front AC line, and now just this weekend, no cold air again!!! We have had to fill our system up 4 times now with freon!! It is so frustrating that our other vehicle, a 2009 Mitsubishi Lancer has had no issues and our newer more expensive vehicle has had a ton!!! (not to mention the power steering fluid leaking and causing a major repair and our battery leaked and caused a major repair as well).

Posted on Aug 08, 2017

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You've got some of the picture, but not all of it.
You need to know what the high and low side readings are, so yes you do need the gauge set. If the system is charged, and the low side is not dropping below 25psi, I would guess the low side pressure switch is faulty. But if the low side is dropping below 20psi when the compressor stops, the system may be low on freon. Which means you have a leak somewhere.
The hissing noise is freon flowing thru the system which could also indicate a low charge.

Posted on Apr 23, 2013

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  •  Stephen
    Stephen Apr 23, 2013

    On a fully charged system, the high side should be between 250 and 300 psi at idle.

  • Mark Rogge
    Mark Rogge Apr 23, 2013

    @ 90 degrees whats the correct pressure for high and low. I added freon yesterdays. Everything worked with 2 cans. All the problems went away. I added a 3rd can because the psi was still low on the low side. I packed up and proclaimed fixed (for now). But the next morning the system was already not working.... and the recirculate button cannot be selected. I havent put on th gages yet but its either overcharged OR already lost all the freon. When I addd the 3rd can yeserday the pressure maxed out around 32 which seemed low. The high pressure seemed low too.

  •  Stephen
    Stephen Apr 23, 2013

    It varies alot - the average low side is 30-40 at idle and the high side is 200-300. That can vary 20% or more but those are the average numbers. Anything higher than 300 usually triggers the high side limit switch, and anything lower than 20 or 25 triggers the low side switch. The only way to know when it is "full' is when you start at a vac and put the recommended amount of freon in. Pressure readings can also be affected by how much air is moving thru the radiator.

  •  Stephen
    Stephen Apr 23, 2013

    The faster the engine is running the higher and lower the pressure is too.



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SOURCE: ac was working fine the

Check the low switch by the dryer or accumulator, its a long narrow cannister,

it will have a pressure switch attached to it or near it. put your, ac on high,

pull the molex off the switch and jump the molex with a wire or paperclip,

if the compressor comes on and the ac starts to cool, you will just need

to replace the low pressure switch, if the clutch does not come on,

check the low switch molex to see if there is 12vlts there. good luck!

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SOURCE: ac not blowing cold

ck your relays-under hood-relays for a/c possible separate on fender well.

Posted on Nov 28, 2011

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