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Old 07-28-2017, 07:34 PM   #1
smith180
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Wrench A/C Not Cold

Over the last two summers, the AC on my wife's Vue has gotten less cold and finally stopped cooling altogether. The car is a 2006 Saturn Vue 4 cylinder 2WD.

I'm new to the forum and have been spending a lot of time reading up on AC issues and fixes. I haven't found clear information on AC pressures. Apparently it's not a simple thing. Before I ask, here is what I've observed/checked:
  • Compressor clutch does engage when AC is turned on
  • Condenser fan turns on when AC is turned on
  • HP side = 70 psi, Low side = 22 psi (78F outside)
  • Checked and replaced a filthy cabin air filter
  • Found dye/oil stain on compressor using UV light

There is a diamond shaped cover on the compressor where the leak appears to be coming from. I've read that is the cover for the scroll control valve and there is also an o-ring seal.

From the pressures I've measured, is my refrigerant low? I can't seem to find a straight answer on the forums, online, or in my Hayes repair manual. (Manifold gauges on loan from AutoZone)

If it is low, I might be tempted to charge it up and see whether it makes it through the summer since it lost it's cool so gradually. If it is warm again in a week, I would begin repairs on the leak. Is my refrigerant low? Am I on the right track?

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Old 07-28-2017, 08:53 PM   #2
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Default Re: A/C Not Cold

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Originally Posted by smith180 View Post
[*]HP side = 70 psi
Way too low, should be at least double that.

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Old 07-28-2017, 09:09 PM   #3
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Default Re: A/C Not Cold

Thanks! I think I'll go ahead with a recharge. I'll post the results tomorrow.

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Old 07-28-2017, 09:30 PM   #4
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Default Re: A/C Not Cold

Finding dye means a leak occurred and the reason for loss of cooling. Refilling a leaking system is just wasting money and refrigerant while not addressing the leak. The scroll control valve is a common problem on Vues using scroll compressors. If you did a thorough uv light search of your ac system and only find dye/oil on the compressor scroll control cover, repairs may be less costly if you can make your own repairs by replacing the scroll control valve, orifice tube and O-ring. Using gauges and evacuation pump is either your choice to continue with restoring ac cooling or have a shop finish repairs.

Here's a link to explain failure; http://www.saturnfans.com/forums/sho...d.php?t=191521.

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Old 07-28-2017, 11:47 PM   #5
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Default Re: A/C Not Cold

I had encountered that thread before but it didn't seem like a leak issue. After reading through it thoroughly, it seems likely there's more going on behind that cover. I'll order the replacement valve Monday. I didn't read anything about an orifice tube. Are you talking about a filter that is supposed to come with the valve or a different component?

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Old 07-29-2017, 06:59 AM   #6
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Default Re: A/C Not Cold

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I didn't read anything about an orifice tube. Are you talking about a filter that is supposed to come with the valve or a different component?
Yes the x thing below the valve. Should come in a kit.

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Old 07-29-2017, 09:10 AM   #7
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Happy Re: A/C Not Cold

OK. Thanks for the clarification. Also that picture is really helpful. Was wondering what it looked like in there!

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Old 07-29-2017, 09:30 AM   #8
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Default Re: A/C Not Cold

Just hope nobody used any leak sealer before or you will have to remove the compressor to get it out.

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