Challenging A/C Issue
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Challenging A/C Issue
Last week I replaced the clutch plate on my A/C compressor. Somehow it fell off, and I cannot figure out how that's possible. The new one doesn't sit completely flat (crummy...) but it works.
Yesterday, the A/C started failing. The Compressor now clicks on, and then turns back off after about 1 second. However, while I see that this is commonly due to low r134a pressure, I'm not sure that's the case here.
I bypassed the low pressure switch to get the compressor to stay on, and tried to charge the system, though I couldn't see anything move through the sight glass.
Now with the low pressure switch re-engaged, the compressor cycles on for about 5 seconds, off for about 5 seconds, and so on. The low pressure rises to about 65 psi and the high pressure drops to about 110-120, at which point the compressor engages (on). Then the low pressure side drops to 40 and the high pressure rises to 140 or so. All with ~70F ambient temperature.
It seems like the low side is too high, and the high side is too low. (???) What could cause that?
Also seems like the compressor is noisier than usual, but possible that it's just my imagination.
Yesterday, the A/C started failing. The Compressor now clicks on, and then turns back off after about 1 second. However, while I see that this is commonly due to low r134a pressure, I'm not sure that's the case here.
I bypassed the low pressure switch to get the compressor to stay on, and tried to charge the system, though I couldn't see anything move through the sight glass.
Now with the low pressure switch re-engaged, the compressor cycles on for about 5 seconds, off for about 5 seconds, and so on. The low pressure rises to about 65 psi and the high pressure drops to about 110-120, at which point the compressor engages (on). Then the low pressure side drops to 40 and the high pressure rises to 140 or so. All with ~70F ambient temperature.
It seems like the low side is too high, and the high side is too low. (???) What could cause that?
Also seems like the compressor is noisier than usual, but possible that it's just my imagination.
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Thanks. It's a 99 mountaineer eith the 302 v8.
I've searched the web quite a bit, but I can't figure out two things related to the likelihood that it's under-charged:
1) isn't 65 psi too high on the low side?
2) why am I having such a difficulty getting it to take any refrigerant in through the gauges. Can is open and the low-side valve on the gauges is open.
Also possible there's a bit of air in the system?
I've searched the web quite a bit, but I can't figure out two things related to the likelihood that it's under-charged:
1) isn't 65 psi too high on the low side?
2) why am I having such a difficulty getting it to take any refrigerant in through the gauges. Can is open and the low-side valve on the gauges is open.
Also possible there's a bit of air in the system?
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From: St Louis
It's quite possible your manifold set is defective, I have no way of knowing...
Of course 65 is too high for a NORMALLY operating system. Yours is not operating normally. If you're seeing that pressure with the can attached and the low side valve open, then you're reading the pressure from the can, not the system.
Give it some time, let it cycle, The refrigerant will only be drawn into the system when the compressor is running and the pressure in the can is lower than the pressure in the system.
Of course 65 is too high for a NORMALLY operating system. Yours is not operating normally. If you're seeing that pressure with the can attached and the low side valve open, then you're reading the pressure from the can, not the system.
Give it some time, let it cycle, The refrigerant will only be drawn into the system when the compressor is running and the pressure in the can is lower than the pressure in the system.
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