Mine did the same thing when the radiator cracked. Not saying that is the cause, just telling you the symptoms sound familiar.
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2005 WK Limited 5.7 ORT | OME HD | Saguaro Front Winch Bumper| Warn Zeon 10s | 17" Moabs w custom powder coat | 265/70/17 BFG TA KO | 1.5" Spidertrax | AIRAID CAI | Gibson 3" Exhaust | DiabloSport Intune | XD 5000K HIDs | JL Stealthbox w A1300 Amp | Valentine 1
WANTED (PM if Selling): Gobi Roof Rack, 4XG Armor, MyGig RHR & Lockpick, Catch Can, Rear Diff Cover, Weathertechs / Quadratec Mats