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You need to do a cylinder leakage test.
It sounds like you may have a head gasket not sealing properly, and this is where your water loss is going and is causing the engine to run rough also.
A quick test is to remove the radiator cap when the engine is cool, then run the engine till it gets hot and when the water is hot you should start to see the water running along in the radiator. Make sure it is full and make sure no bubbling and squirting of water from the radiator happens.
If this happens then it is a good sign that your head gasket needs replacing.
Let me know if you want more information.
Lay out a drop cloth underneath the Dodge Intrepid to protect the floor from coolant spills. Designate an area to lay out each part alongside its bolts and connecting hoses and wires. Use a drop cloth here as well, some of the parts will have traces of grease and coolant.
Disconnect the negative battery cable, using a screwdriver to unscrew the clamp that secures the cable to the negative (-) post. Pull the cable away from the battery post.
Use a jack to elevate the Dodge Intrepid and jack stands to shore up the jack. Release the pressure in the radiator by removing the cap. Take out the drain plug located underneath the radiator. Catch the coolant in a resealable container
Use a grease pencil to mark on the timing belt its position in each pulley before removal. This will save time when reinstalling. If needed, replace the timing belt and skip marking the old one.
Remove the Damaged Pump
Locate the water pump on the Dodge Intrepid. It's mounted on the front of the engine block and connected to the radiator and various other parts through a series of hoses. It's rotated by the timing belt. Study these parts, as you'll have to remove them.
Disconnect or remove the parts in front of the water pump, using an adjustable wrench. In the most common Dodge Intrepid engine--the 2.7L--you'll find, in order: the upper radiator crossmember, fan module, accessory drive belts, crankshaft damper, timing cover, timing chain and guide wires.
Unbolt the water pump from the engine block, using an adjustable wrench. You may have to use a chisel to gently break the seal between the mount and the pump. Discard both the pump and the bolts.
Clean off the mounting area with a shop rag.
Install the New Pump
Inspect the new water pump to ensure it's identical to the old pump and free of any metal splinters or debris.
Arrange the new water pump on the mount. You won't need sealant for the o-ring on a Dodge Intrepid. Hold the water pump and o-ring in place as you secure it with the new bolts. Tighten them with a torque wrench to 105 inch pounds torque in any order.
Install the timing belt and wires, using the grease pencil marks to guide you in installation. Install the rest of the parts in the order removed. The camshaft must be reconnected with a torque wrench at 125 foot pounds torque.
Replace the radiator's drain plug and refill the radiator with the amount and type of coolant specified in your owner's manual. Release the jack and jack stands.
Attach the negative battery cable to the post and tighten the screw on the clamp. Crank the Dodge Intrepid's engine and check for leaks. Then, close the hood.
remove both headlights, radiator, power steering pulley and bracket. Behind the power steering bracket were the lower radiator hoes meets the engine block there is a plastic piece known as the thermostat house held on by three bolts remove three bolts and there is your thermostat
follow the upper radiator hose to the motor . it is attached to a plate, should have two bolts that hold it down to the motor. Remove the hose and bolts and the thermostat is located under this plate. Remember to use some sort of sealant on the gasket when re-installing to prevent leaks.
Follow the lower radiator hose to the engine. The thermostat is in the hose fitting on the engine. It is very difficult to get to, behind the alternator and above the engine mount. I changed mine about 6 months ago -- give yourself plenty of time if your going to do it yourself.
It is on the front side, closest to radiator, at the very end of the transmission by the cover. Itgoes in horizontally, where as the transmission range finder goes down vertically. Hope this helps you.