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Need Quick Help

79vetter on Sun August 11, 2013 6:18 PM User is offline

I am charging my 2000 Silverado and it is 100 degrees here in Texas. I evacuated beforehand and it held fine.

I was able to get 12oz in - compressor (new) cycling. I was on the 2nd 12 oz. can when I saw the Low side go all the way over (to the Retard Section of the gauge).
High Pressure was over 400.

When I saw this I turned off the A/C. I am not sure what to do now.
Looking for some quick advice/

TRB on Sun August 11, 2013 6:27 PM User is offlineView users profile

Why was compressor changed? Debris removed if for a failure?

Check that the condenser lines are attached correctly.

Could have a restriction in the condenser or elsewhere.

Orifice tube in correctly?


When considering your next auto A/C purchase, please consider the site that supports you:

79vetter on Sun August 11, 2013 7:21 PM User is offline

I replaced the compressor because I believe that the clutch was not making contact reliably. Sometimes the a/c would go from cold to warm instantly.
Its 13 years old so I thought it would be worth replacing before it really went out.
I bought a new Delphi compressor and new Condenser, orifice tube, . I flushed a couple of small lines but I did not flush the Evaporator or manifold.
Orifice is in correctly.

I think that I sprung a big leak somewhere because I can hear a hiss now when I shut off the system. I did not put dye into the system beforehand. When I try to add more r134 it seemed to go in but the vents felt cooler for just an instant and Low side went all the way to the end again.

I thought that I would pull another vacuum to verify its leaking and in doing so the refrigerant came out of the vacuum pump "exhaust", along with some oil. I guess it bled off the pressure in the system. When it finally stopped I tried to pull another vacuum and could not get any on the gauge.

I spent all weekend on this and am a little disappointed.

thanks for any advice.

Edited: Sun August 11, 2013 at 7:34 PM by 79vetter

mk378 on Sun August 11, 2013 8:16 PM User is offline

Test your vacuum pump and manifold for air-tightness by trying to pull vacuum on it with the lines disconnected from the truck. You should always get the refrigerant out to zero pressure first before connecting a vacuum pump. They don't like pressure.

It is normal for the low side gauge to go up temporarily to nearly the pressure in the can while you have the low side valve wheel open to charge. But high side at 400 is a problem. Is the high side port before or after the condenser?

Edited: Sun August 11, 2013 at 8:18 PM by mk378

79vetter on Sun August 11, 2013 11:03 PM User is offline

The High side is before the condenser. I will resume tomorrow.

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