Where is the bleed valve or screw for cooling system on my Pyzar?

Ok is that the drain hole i've heard about on the bottom of the firewall.

Checked the line and it wasn't clogged or anything. The water sloshing sound is coming from the top of the dash behind the instrument cluster anyway. My car is right hand drive to so i;m not sure if things are backward(like where the heater core is located normally on passenger side on left hand drive car)i partially took the instrument cluster out and there is some ducting back there. I guess i'm just going to take the entire dash off so I can actually pinpoint where this sound is.

The sloshing only occurs when I acclerate from a stop or take a hard turn. I tried jacking the car and burping the cooling system. I'm in the air force and I live in okinawa, and I just bought the car off another air force guy. He definitley seems to have neglected the vehicle. After I heard the sloshing sound I checked the fluids, the reservoir for the coolant was a little bit low and the radiator was also a little low. So I topped them off and burped it like I said. I took the radiator cap off and had my friend rev the engine as I replaced the coolant that came out and air bubbles where defintley coming up through the radiator. Some more came out at idle then stopped after a while. When the radiator fan came on it took coolant from the radiator as I could see with the cap off and I also replaced that as it took it. I suppose it took fluid because of thermostat opening and taking coolant. Keep in mind I had my heater on during all of this just incase the air bubble was in the heater core. I also suppose the heater core works because it blows hot air. After all this I took it for another drive and the noise was still there. Was I right in doing what I did? If there was air in the heater core wouldnt it have been in the passenger side or center near the heater core instead of behind the instrument cluster? To answer your question no it happens all the time whether the a/c or heat is on, it also happens when nothing is on.

Ok, I took the dash apart and finally pinpointed the location of the "gurgling" sound. Its coming from the center underneath the stereo. So i'm almost 100% sure its the heater core. The sound comes even with the heater off. The heat still blows out like fire. It happens even when I have the car in park and rev the engine. It doesn;t really make the sound when idling though. So if this sounds right to you guys, if it is coming from the heater core, can that damage anything else but my heater core eventually going bad. Any tips on anything I can do to eleviate the sound? Thanks for all your guys help.

No overheating, no coolant loss. I have rechecked the level and both the reservoir and the radiator are full. Would it be a good idea to try to flush out the heater core or just leave it and not mess with it. Just not sure if the air could create hotspots in the engine and cause the head gasket to blow or maybe crack my block.

Im gonna try back flushing the heater core. If that doesnt help, it is always hot here so I really don't need my heater, is it a good idea to just bypass the heater core by plugging the flow line into the return line of the heater core and eliminate it?