I haven't 2006 Dodge Stratus the water
pump has been replaced the thermostat has
been replace the timing belt and it is still
Check the radiator cooling fans are coming on when they should. Check the fan motor, fuse and relay. There's also a sensor on the cooling system that turns them on. Make sure your thermostat isn't in backwards. Thermostat's coil should face the engine.
Try bleeding air from system like this remove cap from overflow tank fill with antifreeze to full mark leave cap off and start vehicle and let idle you will notice level in tank start to rise this is normal once thermostat starts to open level in tank will drop add more antifreeze to full mark then put cap back on.