So I went to change my air filter, (and actually found a dead mouse in there), and I saw the sprayed liquids around what I think is the alternator. Looks like it's leaking from the radiator. Any ideas?

 

Just start the car and you will see where the leak is coming from but, don't let it get too hot.. say 2/3rd of the temp gauge.

Make sure the rad is full of coolant. If not top it off with tap water. That should be fine since you are replacing the coolant anyways with OEM coolant.

 

So u ran the car in my driveway for 10 minutes. Temp guage went up to just under half. Maybe 45% up. Rad fan went on. No leaks anywhere.

 

wash the radiator area then let use it for a week and go back check it to see if the drip still there.

 

Have it pressure tested cold. Pump it up to @ 16 lbs and let it sit, watch the gauge, but if it drops and you need more time, pump it up again. If there's a leak you'll see where it's coming from.

 

since you have coolant above the seam line, I would check the rad cap and see what's up with that.