Originally Posted by 2005JGC
you probably have a cylinder head gasket issue into cylinder 7 (common cylinder ive seen). The 4.7 is VERY sensitive to overheat, if you have overheated it I would look there, also things to look at are a dropped valve seat, or rocker having popped off. Ultimately I would put about 98% odds that the cylinder head will need to come off for the repair, from there your going to have to see if the damage is repairable or if the head will need to be replaced.
leaking coolant onto the passanger floor is the heater core, I would replace all the doors and actuators while your in there, you will likely find broken parts when your in there as it is.
Thanks for your reply. I was kind of thinking the worst but still hoping for better so I did get a chance to tinker on it this morning and here's the result. I'd lke to rule of everything before tearing it down.
Started it, ran it for about 2 minutes just to see if the upper rad hose would build pressure - it didn't. I though that maybe exhaust escaping into the system would quickly build presure.
Checked the exhaust, no smoke, no smells other than normal. So, ran it up to operating temp and still no obvious signs of anything wrong other than misfiring #7 cylinder. The oil and coolant couldn't look any better as there are just no signs of contamination. I also couldn't find any coolant leaks even though it seemed to me as though is was starting to overheat. I'm going to have to get one of those infrared temp guns as I don't trust the temp gauge.
Also, I noticed the bottom rad hose did get hot but feels like there's something in there but I though it may be one that's spring loaded but not familiar with them.
So my next step is to have a look at that #7 plug and see what's happeng there and also try another rad cap.
Edit: I took a second to check the fuse block under the hood and for some reason there was no fuse for the radiator fan! I can only think that someone used it to replace what they must've deemed a more important component.