I wouldn't say it's dangerous unless you live in Death Valley. It's just not long for this world. Every time you hear it squeal remind yourself you'll be spending $1k on a new condenser soon. Or you might get lucky and it's just annoying for the next 20y. It probably starved for oil and scored itself. With a new fan up and running everything should be back ...


Use a rubber tipped blow gun. You should be able to hold it in place, doesn't seem like something you need a threaded connection for.

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