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Need advice for Suburban with front/rear AC - not holding proper amount of freon?

ga1990 on Tue July 05, 2011 11:31 AM User is offlineView users profile

Year: 2003
Make: Chevrolet
Model: Suburban
Engine Size: 5.3
Refrigerant Type: 134a
Ambient Temp: 95
Pressure Low: 42
Pressure High: 250
Country of Origin: United States

So the compressor on my 2003 Suburan LT started making the appearantly common vibrating type noise, so I replaced it this weekend. I replaced the compressor, accumulator and orifice tube. At 1500 rpms my low side pressure is around 42 and my high side is around 250. Everything seems to be functioning fine, however my rear air blows at 57 degrees, and my front is only blowing around 67 degrees. It was around 95 degrees outside when I took these readings. It may or may not have had this issue before I completed the work, I never checked it. The one concern I have is after applying vaccum for 30 minutes, it only took 2 cans of freon (24oz.) to reach these pressures. Per my manual it should have take 4 cans or 48 oz. When I started to put the third can in my pressures went way high (60is on the low side and 400ish on the high)and I had to remove some.

I balanced the oil in the compressor, adding the same amount to the new (after draining) that came out of the old one, and then I added 2oz of oil to the accumulator, which seemed to be the right amount per the manual.

What could be causing the difference in temps? Is it normal for the system to take only two cans of freon? Thanks for the help.

bohica2xo on Tue July 05, 2011 12:44 PM User is offline

What did the old orifice tube look like?


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

ga1990 on Tue July 05, 2011 1:07 PM User is offlineView users profile

It looked fine to me, granted it's the first one I've ever looked at...there was maybe a couple tiny bits in it, but not much at all.

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