Question about 2009 Buick Enclave
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.
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
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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Posted on Jan 02, 2017
SOURCE: dual heat and ac system
broken cable? if possible trace the cables back to the box move then bolth and see if one doesnt, if so you could alwase manually move it for a temp fix
Posted on Jul 16, 2008
Sounds to me like you have a leak leak somewhere. They can put a dye in the lines to find out where the leak is, Then have that fixed and get it recharged again. Its an expensive procedure though. I hope this helped
Posted on Apr 25, 2010
SOURCE: i have a 1994 buick
The air circulation system is designed to go into default mode if it cannot function properly. Default mode is defrost only. That could also be why your getting heat only. The main reason that the system goes into default mode is a vacuum leak. Check the vacuum servo motors that operate the vent doors with a hand held vacuum pump. They are usually located under the dash. If this is the problem then the freon level will have to be corrected or else the AC operation could be effected.
Posted on May 14, 2011
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!
Posted on Jun 28, 2011
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