Strange cooling system behavour
I own a 98 XJ grand cherokee V8 5.8L. I replaced the radiator in the summer because of a pin hole leak and it has been running fine up to a couple days ago. Now the thing is making all sorts of strange noises, for example when I am driving I can hear water running and it sounds like it is coming from the passenger side dashboard. Anyways in addition to the noise it was over heating again or the gauge was displaying that it was over heating. The gauge was jumping around and I was hearing even more weird noises coming from the passenger side dashboard. Almost like a blow off valve for steam. I got home and waited for the truck to cool down. After it cools down I started it up and started adding some coolant to the system. To my shock I was able to add almost 12 liters of coolant/water mix. So mystery solved of why it was over heating. After I added the coolant and sealed off the system it was not overheating anymore but I could hear the water running from the passenger side dashboard even more.
Anyways I get home from my outing and notice a little bit of coolant dripping under neath the truck, however the weather is sloppy to say the least and it is difficult to tell where the leak is coming from. I am looking for some advice in how to troubleshoot this and also looking for advice on what the cause may be. I am pretty savvy when it comes to my vehicle but this one has me stumped. Is it possible that the excess coolant is coming form the over flow? That maybe I added way to much. or is there a greater issue somewhere near the firewall and coolant is pissing out near there? It doesn't seem to be coming from the rad or any hoses.
Thanks is advanced,