Coolant coming out of rad cap.
 

My temp gauge has been moving around quite a bit lately and after a short drive today i noticed that coolant had been leaking out of the rad around the cap. I can see where it has leaked straight down and where the clutch fan has slung some of it around. This just started today, truck isn't overheating. I haven't refilled it or anything, but i did pop of the cap this morning to check the level, could this have caused air to get into the system and now it is blurping it out?..

Time for a new cap.
Is the reservoir overflowing after the engine is up to temp ?
Also check for dampness behind the fan clutch on the water pump hub.Pump could be leaking there from the shaft seal.

No the reservoir isn't overflowing after warm up just the cap. Water pump is a year old already had it go bad on me. its a 99 with almost 100,000 miles.