Hoping for some help here or even advice here..

I have a 2002 Mitsubishi Lancer, OZ Rally and it started overheating on me and leaking coolant from the bottom part of the radiator(hose connector).

Nothing is getting sucked out from the coolant reservoir, stays on full.

I've checked the hose for any holes and leaks, but I've got nothing.
I've also inspected the radiator for any cracks and I've got nothing either.
There's no sludge in the oil dipstick as to suggest any messed up gaskets.
And the thermostat was replaced not too long ago since it locked up in the closed position and I've tested this one to see if it opens and it does.

Could it be a faulty thermostat or even the radiator cap? Any ideas or advice would greatly help.

Thanks..

 

does it overheat while driving, or just while sitting still?