All out of Antifreeze/Coolant, how come my engine didn't overheat!?!? Options

[tomazws]

OK, so this morning just out of curiousity I opened up all the caps under the hood and checked their levels. Found out my Coolant tank is completely empty, way below "LOW", so low that there was nothing there. So immediately I went to the cabinate and poured in everything inside that Toyota 50/50 bottle... but there was only like 1qt left.....

Please not that I don't know anything about motors except changing motor oil and refilling gas from gas station
1. Am I screwed? Is my radiator/engine/car/everything screwed?
2. http://www.6gc.net/forums/index.php?showtopic=22922 <-- in this thread someone questioned if radiator is blown. How do I check if my radiator is blown or not?
3. My gauge reads my engine right in the middle of COLD and HOT.... is the sensor bad?
4. http://www.6gc.net/forums/index.php?showtopic=32767 <-- I think I'm leaking. I've seen red drips under my car, so it shouldn't be head gasket correct? How shall I fix the dripping?
5. http://www.6gc.net/forums/index.php?showtopic=31352 <-- I heard the same sound sometimes, is that a sign that I ran out of coolant or a sign that coolant is leaking into my carpet?
6. http://www.6gc.net/forums/index.php?showtopic=27578 <-- Is Toyota 50/50 bad? Should I switch to Prestone or redlines water wetter?
7. http://www.6gc.net/forums/index.php?showtopic=27378 <-- If I switch from Toyota to Prestone, do I have to flush it first?
8. If I mix the red Toyota fluid with green Prestone fluid, would it mix into a different color?
9. lol am I asking too much questioins?

[Negative]

Wait - I'm not disputing what blu94gt above said but Toyotas use the red coolant from the factory. If no one has changed the coolant over to green during the life of the car then he would still have red coolant in there. I don't know for a fact but I have been told by numerous mechanics and car people that you can not mix the red and green together or it will cause a sludge or something.
As I said I don't know for sure but better to be safe then sorry - he should probably stick with the red. So far Toyota has never steered me in the wrong direction. Plus isn't the red coolant supposed to last longer?

[blu94gt]

Wait - I'm not disputing what blu94gt above said but Toyotas use the red coolant from the factory. If no one has changed the coolant over to green during the life of the car then he would still have red coolant in there. I don't know for a fact but I have been told by numerous mechanics and car people that you can not mix the red and green together or it will cause a sludge or something.
As I said I don't know for sure but better to be safe then sorry - he should probably stick with the red. So far Toyota has never steered me in the wrong direction. Plus isn't the red coolant supposed to last longer?

there was pinkish in my car when I got it. I didn't want to buy the Toyota stuff (plus when I flushed and changed my thermostat I was living in a small town that didn't have anywhere that sold the red Toyota coolant) so I did like I did with all my other cars, flushed and changed to green. Coolant is coolant is coolant. You could use water in there if it wasn't gonna freeze or corrode the engine. I guess I just don't see any added benefit from dishing out like twice the money for Toyota coolant.