Clutch Problems

Sounds like the clutch master cylinder is leaking internally if there's no external leak. I would do the clutch slave and master as a set

Here are a few guides to read, they will help you figure it out

https://www.2carpros.com/articles/clutch-doesnt-work-sometimes-or-not-at-all

https://www.2carpros.com/articles/clutch-symptoms

https://www.2carpros.com/articles/throw-out-bearing-replacement

Removal Procedure
1. Remove the clutch master cylinder push rod from the clutch pedal.
2. Remove the master cylinder retaining nuts at the front of the dash.
3. Remove the remote reservoir.
4. Disconnect the clutch actuator cylinder line.
5. Remove the clutch master cylinder assembly from the clutch pedal assembly.

Installation Procedure
1. Install the clutch master cylinder assembly to the clutch pedal assembly.
2. Connect the clutch actuator cylinder line.
3. Install the remote reservoir.
4. Install the master cylinder retaining nuts at the front of the dash.
Tighten the nuts evenly to 21 Nm (15 ft. lbs.).
5. Install the push rod to the clutch pedal.
6. Bleed the hydraulic system.

Hydraulic Clutch Bleeding

Notice: Do not reuse the fluid that has been bled from a system in order to fill the clutch master cylinder reservoir for the following reasons:

1. The fluid may be aerated
2. The fluid may be contaminated
3. The fluid may contain too much moisture

Important: Maintain the fluid level in the clutch reservoir to the top step with GM P/N 12345347, or equivalent.

1. Clean dirt and grease from the cap in order to ensure that no foreign substances enter the system.
2. Attach a hose to the bleeder screw on the clutch actuator assembly. Submerge the other end of the hose in a container of Hydraulic Clutch Fluid GM P/N 12345347, or equivalent.
3. Depress the clutch pedal slowly and hold.
4. Loosen the bleeder screw to purge air.
Tighten the bleeder screw to 2 Nm (18 inch lbs.).
5. Repeat steps 3 through 5 until air is purged.
6. Fill reservoir to the top step with GM P/N 12345347, or equivalent.
7. Repeat the bleeding procedure if necessary.

Diagrams are attached below

WITHOUT BLEED SCREW

Remove the actuator (slave) cylinder from the transaxle, as outlined earlier in this section.
Loosen the master cylinder mounting attaching nuts to the end of the studs, but do not remove the master cylinder.
Remove any dirt or grease around the reservoir cap so dirt cannot enter the system, then remove the cap and diaphragm. Fill the reservoir with an approved DOT 3 brake fluid.
Depress the hydraulic actuator cylinder pushrod about 0.787 in. (20.0mm) into the slave cylinder bore and hold.
Install the diaphragm and cap on the reservoir while holding the slave cylinder pushrod in as described in the previous step.
Release the slave cylinder pushrod.
The slave cylinder should be lower than the master cylinder.

Hold the slave cylinder vertically with the pushrod end facing the ground.
Press the pushrod into the slave cylinder bore with short 0.390 in. (10.0mm) strokes.
Observe the reservoir for air bubbles. Continue until air bubbles no longer enter the reservoir.
Install the actuator (slave) cylinder to the transaxle.
Tighten the master cylinder attaching nuts to 15 ft. Lbs. (20 Nm).
Check the fluid reservoir in the clutch master cylinder and add, if necessary. Install the diaphragm and cap to the reservoir.
To test the system, start the engine and push the clutch pedal to the floor. Wait 10 seconds and select reverse gear. There should be no gear clash. If clash is present, air may still be present in the system. Repeat bleeding procedure.

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Does youre clutch peddle feel spongy? Or stiff. How old is the clutch? Could havea bad release bearing on the clutch. Also could have a faulty clutch slave cyl.

Good chance the slave is leaking. The bleeder is on the slave down on the transaxel.

Generally, if the MC is higher than the slave you can gravity bleed by loosing the slave bleeder screw (make sure the MC is full) and bleed unto all air is out.
You can also use a small vacuum pump, again bleed until all air is out.

I would first let it gravity bleed for a while then try it and see if you have a good pedal. Make sure to keep the master cylinder full of fluid. If that doesnt work, have someone press the clutch down and hold it down while you open the bleeder

Check the clutch M/C and slave/servo before you get a clutch assy-find out why there's no compression/pressure on the pedal. Maybe there's air in it or leak