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Re: On a O4 Chrysler Pacifica the Thermostat is mounted...
Pictures I have seen, looks like the head. You don't want to have it removed. Doesn't matter what it is. You just need to remove the parts that are in the way. It needs drilled out and retapped to put a helicoil in place. There are kits for this. Take the bolt with you to the parts store. Match it up.
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Break free 2 bolts on thermostat housing, loosen hose going into housing and clamp, it will leak some antifreeze. Once the housing is taken off block clean off old gasket material from both surfaces. The block and housing, be careful not to scratch the surfaces. No sharp pointy objects, aluminum is soft. Then take the old thermostat out and put in the new one. Put gasket in place ,align housing and put , bolts in by hand first, so it doesn't cross thread. Just snug bolts and top off system with antifreeze . Start engine ,put on heat and run until thermostat opens. Check for leaks, tighten bolts 1/4 turn should be fine. Add antifreeze in overflow bottle if needed.
remove the coolant cap to relieve the pressure. Follow the radiator hose to the motor. The metalic/aluminum part that the hose is connected to holds the thermostat. 2 or 3 bolts hold it to the engine. remove these bolts & the thermostat. there may or may not be a gaket with your model. If so, replace them both. You will lose some coolant. add coolant when you're done, Make sure the engine is cold when u do all this.
follow the large radiator hose from the radiator to the engine, you'll see a large clamp holding the hose onto the neck thats bolted to the engine block, under the neck is where your thermostat is located
Follow the TOP hose on your radiator to where it connects on your engine block. The thermostat is under the metal piece mounted to the block which the hose is connected to. It typically has to bolts to remove and you will find the thermostat under it once you remove the mounting.