Concorde over heating fluid apears to be blowing out somewhere around espansion tank

Don't shoot the messenger - but from my experience with this the most likely problem is what is called a "blown head gasket". This occurs when a motor has overheated and the head gasket that separates the upper and lower engine compartments is damaged. This causes the blow back into the expansion tank as you have described it. There are a couple ways to check if this is truly what has happened. When the motor is cool look into the fluid in the expansion tank and see if there is any oil floating on top of the radiator fluid. It does not have to be alot just a little. This is a sure sign. The blow back into the tank is also a pretty sure indicator too, however. The most sure test is a pressure test that is done on your radiator. Once pressure is pumped into the sealed radiator there should be no pressure loss. If it goes down even a little then the mechanic knows that the gasket is damaged. Don't freak out though because if you shop around you can have you head gasket replaced pretty inexpensively. You should be good to go for a long time because Concord's are known for having really good motors. Note: to prevent this from ever happening in any car you own - if the car starts to heat up stop immediately and get it serviced. This will prevent a "blown" gasket from happening in the first place. Also if you're going to keep this car and it's getting up in the miles have the timing belt replaced. You should be good to go!!! Good Luck!!!

I have a Chrysler. 1999 town and country its makes ng a squeaking noise and its leaking antifreeze what can it be please help me