Clutch has no pressure, but no leaks.

I don't think that's it I think the spring in your pressure plate has collapsed and your clutch disc is finished you can try to adjust it but I think it's done

Hi it can be your clutch or pressure plate and also your clutch slave cylinder

They will usually have a bad slave cylinder or clutch master cylinder. See if you see any leaks at those parts. The clutch master cylinder may leak on the back side so you may have to look underneath the dash to see it. Fill with fluid and pump pedal, have someone look while pushing on pedal. It will be wet from the leaking fluid.

if you have clutch fluid check and if you have clutch cable check

have you put a new cluch plate and a new pressure plate?

It sounds as if you have 2 problems here.

The fact that the clutch pedal went to the floor and stayed there suggest a fault in the master cylinder. It may be that you need to overhaul the master cylinder.

Overhaul kits are available at less cost than a clutch master cylinder:
0results for isuzu rodeo clutch master cylinder overhaul kit

The grinding noise ... A grinding noise would be caused by either the gear not engaging properly because of the defective clutch.

Or, if it is more of a squealing noise - that may be the clutch release bearing at fault.

Are you absolutely sure that your entire clutch unit - pressure plate, driven plate and release bearing aren't worn?
116results for isuzu rodeo clutch

there is not transmission fluid in a manual transmission, only a pressure clutch that should have a canister located on the firewall under the hood. Not a big canister. Smaller than the brake fluid canister. And it takes brake fluid. If your clutch is working fine your fluid level is probably fine. Usually only have problems with them when the slave cyl. gets a leak. And if it were leaking your clutch would probably fail.

It is most likely a hydraulic clutch, and it is most likely leaking at the clutch slave cylinder. Check the clutch master cylinder for fluid, it should be a small master cylinder looking thing with a fill cap next to the brake master cylinder and booster unit. If it is empty fill it with the same dot 3 brake fluid that you use for your brake master cylinder, and make sure that you are pouring the fluid into the clutch master cylinder reservoir and not the rubber seal that should be under the fill cap. After filling the clutch master cylinder up with fluid, then try and pump up the clutch pedal. It might take a while to pump up hydraulic pressure, and you might also have to work the pedal a few times by hand at first.

Also, you might have to bleed the clutch at the slave cylinder if it will not build up enough pressure to release the clutch.

could be a leak in the hydraulic clutch system.

Something isn't put together right or is out of adjustment. At the very least, a spring should be keeping the pedal up.

When you "bled the lines" did you also bled through the slave cylinder?