Where is thermostat located on 2005 Dodge neon?

It is under the housing that the upper radiator hose hooks to on the engine .

To replace thermostat follow this procedure :---
Removal & Installation

1. Drain cooling system to the thermostat level or below.
2. Remove coolant recovery/reserve system hose and radiator upper hose.
3. Remove thermostat/engine outlet connector bolts.
4. Remove thermostat and O-ring assembly. 
   
   
   

   Fig. Pressure cap (1), thermostat housing/engine outlet connector (2), thermostat (3), O-ring (4) and vent facing up (5)
   Pressure cap (1), thermostat housing/engine outlet connector (2), thermostat (3), O-ring (4) and vent facing up (5)

To install:

1. Clean all sealing surfaces.
2. Place the new thermostat assembly into the thermostat housing/outlet connector. Align vent with notch in cylinder head.
3. Install thermostat housing/outlet connector onto cylinder head and tighten bolts to 110 inch lbs. (12.5 Nm)
4. Install the radiator upper hose.
5. Connect the coolant recovery/reserve system hose.
6. Fill the cooling system

This details will help.

Thanks.

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