1998 Sunfire clutch bleeding.

Took my car in with a "soft clutch"...that had trouble shifting gears. Mechanic said it was "bleeding’...and quickly fixed the
problem. It’s 1 month later...and my clutch has no tension...and is soft again. What do you think could be the problem?
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I'm assuming a Sunfire has a hydraulic clutch, since your mechanic was able to "bleed" it. A hydraulic clutch basically works like two syringes - one under your foot and the other at the transmission - both connected together with a hose. You push on the one at the pedal, fluid moves to the other, and the other pushes on the clutch.
The sponginess is from air mixed in with the fluid. Something must be leaking. Your mechanic fixed the symptom without addressing the problem. Of course, the leak could have been small enough that he couldn't see it the first time.
If you can locate the clutch fluid reservoir under the hood, have a look. It's probably empty. The fluid doesn't get used up, so it's leaking somewhere.
Likely causes are the clutch master cylinder, the clutch slave cylinder, or the hose. Frequently it's the slave cylinder because that lives on the hot end of the system.
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