Coolant leak on 2006 chrysler sebring v 6 seems to be at top of engine where overflow tank hose connects to engine

From your description sounds like you have a blown head gasket or a cracked head either way you will need to pull the heads and have them checked by a machine shop sorry for being the bad news guy Good Luck Mike L.

pressure causes the coolant to go into the overflow, as the engine cools it siphons back to the radiator. if the tank keeps running low you must have a leak some where

change the cap

Replace the coolant air bleeder, front and center top of the engine. Remove the 10mm bolts holding the air intake down, prop it a a few inches, take the four bolts out and the two bolts holding the top radiator hose to it, polish ip the top of the motor where the pice sits bolt it back together. It took me about ten minutes to put in the new one. The part from advanced auto was 39 bucks, comes with a new o ring for the top hose, it is a piece of cake.

advance auto parts sells this. should be a dorman part number 902-302. Its called engine coolant outlet flange

If everything is working correctly; thermostat, heater core, water pump, head gaskets, etc. Then that leaves the radiator cap, the overflow hose or the overflow tank as being the problem.

As the engine heats up the coolant expands flowing into the overflow tank. As the engine cools the coolant is drawn back into the engine from the overflow tank. but this depends on the vacuum created by the cooling liquid. the radiator cap has a "valve" that lets pressure out and vacuum in. If it fails then you may not achieve a good vacuum. The hose that connects to the over flow tank must be non leaking as well; if it leaked then coolant would not be drawn back into the engine, only air would be sucked in. And lastly the coolant has to be drawn from the bottom of the overflow tank. again we dont want to be sucking air.

Some engines require a vent screw to be opened when bleeding the air out of the engine.

Chrysler & Jeep Cooling System & HVAC Service: Every car make has its quirks, and Chrysler and Jeep vehicles are no exception. In researching this article, we found several examples of heater problems in these vehicles that seem to be fairly common.

On 2001 and 2002 Sebring Sedan, Sebring Convertible and Stratus Sedan, plus 1993 to 2002 Chrysler Concorde, LHS, New Yorker and 300M, Eagle Vision and Dodge Intrepid models with V6 engines, customers may complain their engine is overheating, or the heater is putting out little or no heat.

Chrysler Technical Service Bulletin 07-002-02 says the problem can be caused by a low coolant level in the cooling system. On these vehicles, air trapped inside the cooling system can displace coolant when the system is refilled. The radiator and coolant reservoir may appear to be full, but there still may be air inside the heater core and heater hoses. This will create a low coolant level that may lead to overheating and low heater output. The bulletin provides a special fill procedure to eliminate the trapped air so the cooling system can be completely filled.

The procedure goes as follows:
1. Obtain Chrysler special tool 8195 (Cooling System Filling Aid). The tool looks like a funnel and attaches onto the filler neck (just as a regular pressure cap does). But it also has a hose clip.
2. Attach the filling aid tool to the cooling system filler neck. Use the clip to pinch off the overflow hose attached to the fill neck. Attach a 4-6' long 1/4" ID clear hose to the bleed valve. Put the end of the hose into a clean container (to prevent coolant from spilling onto the accessory drive belts).
3. Open the cooling system air bleed valve before any coolant is added. If you do not do this, air can remain trapped inside the system and you won't get all the air out. On 1998 and later models with 2.7L engine, the valve is located on the water outlet connector at the front of the engine. On 3.2L and 3.5L engines, the valve is located on the lower intake manifold, left of center under the upper intake manifold. On 1993-'97 models with 3.3L and 3.5L engines, the valve is on the thermostat housing.
4. Pour a 50/50 mixture of coolant and water into the large side of the filling aid funnel. Use distilled, deionized or reverse-osmosis purified water, not ordinary tap water, which may contain salt or minerals that could contaminate the coolant.
5. Slowly fill the cooling system through the large side of the filling aid. Watch the hose connected to the bleed valve. When a steady stream of coolant comes out of the hose, close the bleed valve and continue filling to the top of the filling aid.
6. On 1993-'97 models, place a small, clean container below the end of the overflow hose. Then remove the clip from the overflow hose. Any excess coolant in the filling aid will now drain into the overflow section of the coolant bottle or into the container.
7. On 1993-'97 models, remove the reservoir and recycle the excess coolant.
8. Remove the filling aid from the fill neck. Make sure the filler neck and cap are clean, then replace the pressure cap on the coolant bottle.

Note: 1998 and later coolant bottles have two chambers. Coolant will normally only be in the inboard (smaller) of the two. The outboard chamber is only to recover coolant in the event of an overheat and should normally be empty - except for the coolant drained from the filling aid. This coolant will be drawn back into the pressurized side of the cooling system over time.

Hope helps.

Replace the sensor. It is typically located on the top of the engine somewhere.

Replace the water outlet housing. Most likely not covered, but doesn't hurt to ask.

If it's leaking at the top of the engine down. Look at the top of the engine at the front and you'll see a bleeder valve on top a black housing. These housings like to come apart at the glued seams. If it's leaking at the lower part of the engine towards the front, it could be your water pump leaking. Check your oil and if you see the color of the oil looking like chocolate milk, your water pump needs replaced, the oil will need changing as well. Do a coolant system pressure test and see if your hoses somewhere are leaking. Also check for your surge tank leaking. This is the tank that you put coolant into.