Refrigerant Type: R-134a
Country of Origin: United States
Just replaced the expansion valve and receiver-drier. Pulled a vacuum for about half an hour. The manifold gauges are pegged with the pump running, but drop down to near zero in a few minutes after the pump is shut off. The evaporator case was full of leaves and in a lapse of judgement I sprayed the coil with a water hose without plugging the open lines. I let the evaporator case out in the sun for a few hours and then ran compressed air through the evaporator to purge the water and contaminated oil. I then added 10 ml of PAG oil to the evaporator. New o-rings were installed at evaporator, expansion valve, and receiver.
There's a steady stream of vapor in the pump exhaust with the ballast valve open.
Will running the vacuum pump for a longer time eventually result in clear exhaust stream and a dry system which holds a vacuum?
If it were just water contamination, the vacuum wouldn't drop all the way to zero. There is a leak. Testing under pressure should reveal it especially if it is under the hood and not one of the connections in the evaporator box.
Edited: Sun September 09, 2012 at 6:10 PM by mk378
The manifold set was disconnected from the system and then evacuated fully. After the manifold valves were closed the gauges leaked down rapidly.
What's a good way to find the leak?
Edited: Mon September 10, 2012 at 7:43 AM by Wobbly007
Problem was the gauge manifold push-on couplers. When 150 psi nitrogen was applied to the system, I could hear the couplers leaking. Looked like they couldn't be repaired, so I bought a set of Santech replacements for a hefty price.
We've updated our forums!
Click here to visit the new forum
Copyright © 2016 Arizona Mobile Air Inc.