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Leak from Rear Driver's side

My 2007 Tahoe is leaking a bluish or greenish fluid from the rear driver’s side. I have not looked to see exactly where the leak is coming from, but was wondering what this could be?

Blueish/greenish? Sounds like windshield washer fluid. Shouldn’t be any other fluid anywhere near there. The tube may have come off the pump. Does the rear window washer work?

Or maybe it is a rear heater hose if equipped with one. Chances are the answer is under the hood. You should be low on some fluid.