HOW TO CONFIRM IF A/C SYSTEM IS DISCHARGED OF PRESSURE

  • Tiny
  • roycar71
  • 1998 GMC Jimmy
  • 6 CYL
  • automatic
  • 125,708 miles

Hello, I have just recently came back from mechanic and was told I need to replace my compressor because it has "hole" and is "warped". He did a evacuate and recharge to test it. He told me I need to replace drier (I assuming this is the accumulator too), and orifice tube. Along with flushing system. I am able to see the parts to replace and they don't seem hard to take off. I have an empty can of Freon with psi gauge. When I hook it up to low port of system it reads 0 while engine is on and a/c is full blast. Is this reliable indicator to take apart a/c components with out danger?

p.S. It seems the mechanic evacuated, recharged, and evacuated again. :-)

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Monday, May 7th, 2012 AT 12:47 AM

9 Replies

  • Tiny
  • mhpautos
  • Expert
  • 30,598 posts

You should have both sides of the system checked with the correct A/C manifold gauge, never crack open any lines to check for pressure.

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Monday, May 7th, 2012 AT 1:04 AM
  • Tiny
  • roycar71
  • Member

Harbor frieght has gauage manifold with low and high gauges. Could this be something used to confirm presure and once confirmed I could take off components? Thanks.

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Monday, May 7th, 2012 AT 1:07 AM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,556 posts

Yes, that will work.

Roy

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Monday, May 7th, 2012 AT 2:48 AM
  • Tiny
  • roycar71
  • Member

If there is presure. Can vacuum be used? Thanks again.

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Monday, May 7th, 2012 AT 3:07 AM
  • Tiny
  • ASEMaster6371
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  • 25,556 posts

There may be a small amount of residual pressure. You can vent that with your gauge set.

Roy

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Monday, May 7th, 2012 AT 3:10 AM
  • Tiny
  • roycar71
  • Member

Well is that common to have no pressure on low part and some on high port?

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Monday, May 7th, 2012 AT 3:12 AM
  • Tiny
  • ASEMaster6371
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Yes

Roy

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Monday, May 7th, 2012 AT 3:18 AM
  • Tiny
  • roycar71
  • Member

Ok, I will cost compare amount of gauges vs. Going to shop that would do a evacaute. Thanks.

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Monday, May 7th, 2012 AT 3:24 AM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,556 posts

Good set is about 100.

Roy

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Monday, May 7th, 2012 AT 11:20 PM

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