Posted by Steve@Advance on July 19, 2016 at 15:42:14 from (24.182.105.179):
I've got an air conditioner doing some strange things!
This is on an 06 F350 Superduty 6.0. The AC has been working great, no problem, no leaks, nothing tampered with. A couple weeks ago it started cooling intermittently. The air would go from reasonably cool, then warm slowly to near ambient, then back to cool.
The owner (my boss) wanted me to look at it, though I didn't have my gauges with me, just one of those low side charging hoses. So I put it on, showed low low side, I added one can which brought the pressure up to normal, starter cooling, worked for about a week.
Yesterday I looked at it, ran it while watching what was happening. Did not put gauges on (they were at home). The temperature would vary, cool to warm, the compressor was not cycling off and on, running steady. My assumption was it had leaked refrigerant and was back to where it was last week.
Today I brought in the gauges, connected them, started it up. The ambient temp was around 90*, and it had been sitting in the sun, still in the sun when I ran the test. The low side went to around 45, the high side went to nearly 500! Too much refrigerant, my first thought. I let it run, around 1500 RPM. The high side stayed way high, though it did come down some, 400-450, but it was cooling. So I let some refrigerant out (yes, feel free to turn me in to the Freon police!)
I got the high side to come down to around 300, but the low side dropped to about 20, quit cooling, cycling switch bypassed, compressor running steady. Then the high side dropped down to 150 or so. So I put some refrigerant back in. Got the pressures to level out, somewhat normal, 40 and 250 best I remember, looking good, cooling. Then both pressures dropped, low went back down around 20 something, high 200, quit cooling. Then they started back up, back to normal. But the high side needle on the gauge was bouncing, just a red blur bouncing between 250-300. Then it repeated the cycle several times.
I had to leave it, he needed to go. Later I asked if it worked, said it was working steady but not cold as it should be.
So, what's happening? No evidence of belt or clutch slipping. Condenser clean and fan working. When it quits cooling the return line gets warm, so it's not the blend door. The system has not been open or anything added (until last week) for 300,000 miles, so I can't see moisture being in the system. It has an orifice tube, no expansion valve.
Anyone experienced this? Common to this model? What kind of compressor does this have. I've seen reference to variable output compressors, Is this one of them?
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