Low/high sides almost the same

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Mar 8, 2016 | 06:06 PM

dman776

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Joined: Mar 2016

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Low/high sides almost the same

Hi guys, first post here.

2000 Ford Expedition
AC had not been working for a year or so. I had tracked a leak down to the evaporator. Also, I had a very slightly noisy compressor/clutch.

I finally got around to pulling the dash, replacing the evap, accum, orifice tube, blend door, and heater core.

Got it all back together. Pulled a vacuum to 26psi or so.

tried to load in some R134a and I see the following:

low side - 110 psi
high side - 110 psi
after a few mins, i see the ac clutch kicking in for about 5 secs at a time.
The high side pressure goes up by 5psi (115psi or so) then back to 110psi when the clutch disengages.

Since the system sat so long without a charge (12mos), could the compressor have failed (seals)?

Any ideas?

Thanks for your patience.
Darryl

Mar 10, 2016 | 12:30 AM

Torky2

Fleet Mechanic

Joined: Sep 2003

Posts: 1,716

Likes: 15

Quote:

Got it all back together. Pulled a vacuum to 26psi or so.

Vacuum is measured in inches of Mercury, or Microns. If you meant 26" of Mercury, that's a poor vacuum. If you were at the top of Mt. Everest, though, you could go with it

Quote:

tried to load in some R134a and I see the following:

low side - 110 psi
high side - 110 psi
after a few mins, i see the ac clutch kicking in for about 5 secs at a time.
The high side pressure goes up by 5psi (115psi or so) then back to 110psi when the clutch disengages.

Since the system sat so long without a charge (12mos), could the compressor have failed (seals)?

Any ideas?

Internet is imperfect, we can't see exactly what you did, and what you may have missed. How about a cockpit error?
Hi-side side wheel valve not closed tight on manifold gauge set?
Orifice Tube not installed?
Orifice Tube installed minus the O-rings, or rings displaced because lubricant not used when inserting tube?