98 intrepid over heating
 

98 INTREPID 3.2 LITER, FLUID IN OVER FLOW TANK WAS BUBBLING AND COMING OUT OF OVER FLOW.FIRST WE REPLACED THERMOSTAT NO HELP REPLACED WATER PUMP TAKING TOP OFF THREE TIMES TO GET TIMING SET CORRECT.WELL JUST LIKE BEFORE TEMP,GAUGE DOESNT SHOW IT IS OVER HEATING BUT FLUID WAS BOILING IN TANK COMING OUT OVER FLOW ONCE AGAIN FOR THE TENTH TIME I LOST ALL MY ANTIFREEZE.HELP PLEASE WHAT COULD BE CAUSING THIS? thermostat again?

Clogged radiator, clogged coolant passages, air in the system, cooling fans not operating. To name a few.

Bubbling antifreeze in the resovoir
 

I just had this same issue. Thought maybe blown head gasket. Had the thermostat replaced as a starter. Worked fine for a few days then started up again. Was at brother in laws house when it happened again. He took a look at it, went into garage and came out with a radiator cap pressure tester. Turns out the radiator cap was bad. Bought new radiator cap and nothing more so far.