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What device are you asking this question about, please?
Is the copper line a single line (just going out), or a double line (there should be one coming in again, I think.) ?
The copper line is a single line. IF fluid were circulating through a condenser or cooler, then you'd think there would be a return line.
Is the air conditioner providing cooling, some... or not?
What maker, model #, is the main unit (not the condenser, though I wouldn't mind hearing about that) ?
The lines might need recharging with coolant, but that's just a notion at this stage. Let me know more, what I just asked about, please.
A buzz followed by rushing air, means the external condenser unit has an internal fan, doubtless.
The buzz would be the fan's startup noise, I suspect.
Do you know how old your Carrier Comfort is? the heat exchanger has a 20-year warranty.
But I'm inclined to suspect that it needs recharging owing to a leakage of coolant... and did this problem come on suddenly? or just gradually?
Well... I'm not sure about the warranty on the external exchanger, or whether warranty covers the recharging (with coolant) that probably is the most of what it needs.
Calling service on it may be all that can be done.
Note: that should be done at once. Devices of this sort that run at a low coolant pressure for a while, wear out.
Which fan does not start up? I thought you said you hear a noise like air rushing somewhere... unless that was the noise of the coolant moving, perhaps?
If the heat exchanger isn't exchanging heat owing to low coolant pressure or levels (and if you see a coolant pressure gage anywhere, be sure to check on it), then the heat sensor may never require that the main fan turn On.
I don't think so. Why wouldn't the heat exchanger be working then?
Your Carrier system has had coolant leaks before... I'm sorry, but it seems to me that it's either an expensive-ish repair, or maybe replace the whole thing if you keep it running with no coolant in it - that can be necessary.
That would be (in my phraseology) what you called the outside condenser.
Perhaps that could also be a problem. As I said before, look for a gauge on it that indicates coolant level or coolant pressure.