Why is it that anti-freeze leaking out of your 2003 2.7 sebring engine under the thermostat through a hole there in block?

A hole in the engine block itself, near the thermostat, allowing antifreeze to leak is a serious problem and almost certainly indicates a cracked engine block. The thermostat housing is usually made of metal or plastic and sits *on* the engine block. A leak *through* a hole in the block itself means the block is damaged.

Several things can cause a cracked engine block:

* Overheating: This is the most common cause. Extreme heat can warp and crack the metal.

* Corrosion: Over time, corrosion can weaken the block's structure, making it more susceptible to cracking, especially in areas like the freeze plug locations.

* Freezing: If the coolant freezes, the expansion can crack the block. (Though less likely in a hole near the thermostat.)

* Manufacturing defect: While rare, a defect in the casting process could create a weak point that eventually fails.

* External damage: A significant impact to the engine could cause a crack.

Unfortunately, a cracked engine block is a major repair. It's usually not economically feasible to repair a crack in the block itself on an older vehicle like a 2003 Sebring. The cost of repair (potentially involving welding or block replacement) often exceeds the value of the car. You'll likely need to consider the car's replacement.

Before accepting this diagnosis, it's crucial to have a qualified mechanic inspect the engine. While a crack is the most likely culprit, there's a slim chance another component, such as a severely corroded freeze plug nearby, could be responsible. However, a hole directly in the block itself strongly points to a cracked engine block.