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Either there is still air in the cooling system or you are correct that the headgasket has failed.
Running with the cap of for at least 20 minutes should clear the air out of the cooling system. If it continues to bubble after that than the bubbles are likely combustion gases sneaking by the head gasket.
Let run it with the cap on and let it start pushing coolant into the overflow. Shut it down and smell the coolant reservoir. If it smells like exhaust it is the head gasket.
On drivers side, Look for holes in rad support above headlights and you'll see a bubble level. Behind light housing you'll find small hex, or torx head screw just left and behind bubble level area. That's Horizontal adjustment. Now go over to right about 3 " from bubble level,just past where headlight mount is attached and look down hole for another hex, or torx screw head. That's vertical adjustment. Passenger side location will be obvious after finding drivers side adjustments.
if the leak is actually coming from the head gasket the only way to repair it is to replace the head gasket which involves removing the engine, pulling the valve covers off and much much more... probably not anything your going to want to do in your driveway... if you arn't losing any oil or coolant and have no check engine light on, i don't imagine that it is a very big leak at all. i would continue to drive the car as usual and just watch the leak- if it gets worse you should have the heads done. just remember to check your fluids... it can be very costly to put head gaskets on.
Pull the oil dipstick and see if you have a lot of bubbles in the oil. If your head gasket is blown you will have coolant mixing with oil causing the bubbles. If you don't see the bubbles, you may still have a bad head gasket but should consider that it may a be a bad intake manifold gasket. Look on the ends of the engine block - where the transmission attaches on the driver's side and the drive belt is on the passenger side. Look for signs of coolant leaking onto the outside of the block castings at the base of the lower intake manifold chamber (it looks sort of like the flattened bottom of a V) . If it's there you may just have the manifold gasket leak. My '03 T&C with the 3.3l had this problem. It ran rough, and only with no pedal being applied. Driving was tough to get it to the shop since it died at each stop light and required the gas pedal to be feathered to keep it running.
If you have more than amateur skills you can replace it yourself.