I have a ' 95 Chrysler Concord. and for no reason, the temperature kept rising and the car was being overheated, pushing the water off the reserver tank and the oil looks clean, not milky, and the water looks ok too. how can I fix this problem? Please give me any help and suggestions... Thank you.

thermostat stuck open and passing water before the engine reaches operating temperature
check for correct water level in the radiator

check your thermostat , and water pump

if the water pump was a internal water pump it runs off timing belt. timing may be out. This happens alot and it dosent have to be out much to keep it from starting. This could be the problem if it is a internal pump and happens alot. I have fix alot of cars with this problem.

Check your heater core. May be clogged and needs to be replaced

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You may start to check first if the radiator has holes that is why the radiator is loosing water. Temperature will rise up because there is not enought pressure to the radiator to s_uck water from the reserve to circulate to your radiator and engine. If there are no holes then you need to check the water pump. The water pump might gone bad that is why water cannot circulate.

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When your temperature gauge reaches "H' it may too late to prevent a major breakdown. Knowing the symptoms of an overheated car and how they occur may be the difference between being inconvenienced and incapacitated.
Identification:---Other than a low oil level or low oil pressure light, there is not a more significant part of a car's instrumentation than a rising temperature gauge or a glowing "Hot" light. These lights are really the only confirmation a driver has that his car is really overheating. It is the identification of the symptoms of an overheating car that enable the motorist to avert a badly damaged engine. Overheating is always a traumatic event for a car's engine, which makes the early identification of the symptom an important addition to the informed motorist's tool kit.
Stuck Thermostat:--The car's thermostat is a valve that controls coolant flow from the engine block to the radiator. When the engine is cold the thermostat remains closed so that the coolant can reach operating temperature quicker and also provide heat to the passenger's compartment. The thermostat has a spring on it that moves depending on coolant temperature causing the thermostat to open. Sometimes the thermostat fails to open thus restricting coolant flow to the radiator where it would be cooled down. This condition is often the cause of overheating. The symptoms of this cause would be a rising temperature gauge and possibly the loss of heat inside the car.
Restricted Radiator:---A car's radiator will have thousands of gallons of coolant passing through in its lifetime. Along with the coolant comes particulate matter in the form of corrosion breaking loose from various parts of the car's cooling system. These contaminates collect in the tubes of the radiator reducing its efficiency. Extensive "plugging" in the radiator will cause the car to overheat. The symptom of this condition would be a rising temperature gauge which goes up when you accelerate.
Coolant Loss:--A car's cooling system is a closed loop system. You are not supposed to lose coolant. Sufficient coolant loss will cause the engine to run hot because engine is heating less coolant to higher temperatures. The symptom of overheating induced by coolant loss would be a pool of coolant on the pavement when the leak is external. Steam under the hood as the lost coolant hits hot parts of the engine, or a rising temperature gauge in the case of a undetectable engine related leak. Of course, the gauge would also go up if the leaks were not detected. Deteriorated Water Pump:--Cars use a belt driven pump to push the water and coolant mixture through the cooling system. This part is called the water pump. Rarely the impeller that draws the coolant through the pump will rust away making it impossible to push any through the system. If this occurs the temperature gauge will climb and coolant will boil over in the radiator. Inoperable Fan:----Most cooling fans are electrically driven. Some are driven by fan belts. If a belt breaks or the electric supply to the fan is interrupted overheating may result. Electric fans are tuned on thermostatically when needed. When the car runs at idle for extended periods or the weather is extremely hot, a failed fan will cause overheating otherwise it serves as a standby assist to the rest of the cooling system. In stress conditions an inoperable fan will cause the temperature gauge to rise. This will help. Thanks please keep updated.please please do rate the solution positively .thank you for using fixya

think impeller drive is slipping on the drive in the water pump

Check your fuses first...I think they are on the driver's side, side area of the dash.

Next, I know this says SENSOR but this is the steps to replacing the FAN SWITCH:

2.7L Engine

1. Disconnect negative battery cable.
   
2. Partially drain cooling system.
   
3. Disconnect the electrical connector .
   
4. Remove engine coolant sensor from coolant outlet tube .
   

To install:

1. Apply thread sealant to sensor threads.
   
2. Install engine coolant temperature sensor into coolant outlet tube.
   
3. Tighten sensor to 20 ft. lbs.(28 Nm) torque.
   
4. Connect electrical connector to engine coolant temperature sensor .
   

Water pump gone.

Not really, there is a high and low solenoid on the side of the transmission, sometimes they become loose and disconnect.