Lower radiator hose connects to another pipe

This task is going to require many, many lines of answers.
Please contact a public library or a car parts store for a manual to read and follow the steps.
Here is a thumbnail sketch of what to do.
1) drain the radiator into a pan or bucket, being careful no to spill the coolant.
2) locate the thermostat and remove the lower radiator hose where it connects to the gooseneck.
3) Unbolt the thermostat and gooseneck.
4) Clean the block and gooseneck surfaces and replace the thermostat, adding the new gasket if it comes with one.
5) Attach the gooseneck and the lower hose.
6) Add the coolant to the radiator and "burp" the system.
God bless your efforts.

3.8L Engine

1. Drain the engine coolant.
2. Remove the upper radiator seal.
3. Remove the upper tie bar.
4. Disconnect the coolant overflow hose from the radiator.
5. Plug the coolant overflow hose.
6. Disconnect the upper and lower radiator hoses.
7. Remove the transaxle oil cooler pipe bracket bolt from the lower tie bar.
8. Remove the cooling fans.
9. Slide the plastic cap off the transaxle oil cooler pipe quick connect fittings.
10. Disconnect the upper and lower transaxle oil cooler pipes from the radiator.
11. Remove the A/C condenser mounting bolts.
12. Separate the condenser from the radiator.
13. Lift the radiator up and out of the vehicle.

To install:

1. Install the radiator to the vehicle. Place the bottom of the radiator in the lower pads.
2. Install the condenser to the radiator.
3. Install the A/C condenser mounting bolts and tighten to 115 inch lbs. (13 Nm).
4. Push the upper and lower transaxle oil cooler pipes into the radiator quick connect fittings, until a "click" is heard.
5. Tug gently on the cooler pipes to ensure proper retention.
6. Slide the plastic caps (1) over the quick connect joints.
7. Install the cooling fans.
8. Install the transaxle oil cooler pipe bracket bolt to the lower tie bar and tighten to 89 inch lbs. (10 Nm).
9. Install the upper and lower radiator hoses.
10. Connect the coolant recovery hose to the radiator neck.
11. Install the upper tie bar.
12. Install the upper radiator seal.
13. Fill the cooling system.
14. Inspect the transmission oil level.

It's not bolted on. You just need knowledge and the right tools.

1. Make sure the engine is cool.
2. Using a clean bucket disconnect the lower radiator hose and carefully drain around 1 gallon off coolant then reconnect hose.
3. Follow the upper radiator hose to the engine where it's connected to the gooseneck on the engine.
4. remove the 2 bolts holding the gooseneck and lift it up to remove the thermostat making a mental note on how it was installed.
5. Clean both sides of the gasket surfaces, install new thermostat in the same position it was removed and replace O ring(only use a Motorcraft replacement to avoid having fit issues) alternate tightening bolts until tight.
6. Refill radiatior to proper level.
7 Leaving the raditor cap off, start the car turn on the heater and let it warm up keeping an eye on the coolant level, it will go down once the air works it's way out of the cooling system.
8. Top off the system and tighten radiator cap. Check the coolant level several times during the week, there may still be some air left in the system.

Hi, if you follow the bottom hose on your radiator to your motor, right where the hose goes is where the thermostat is. Its pretty simple to replace.
Follow the hose that goes from the top of the radiator to the top of the engine. The hose is black flexible, roughly 1.5" in diameter. This hose goes into a "gooseneck" on the top of the engine, secured with a clamp. Remove the clamp and the hose, and remove the gooseneck from the engine. The thermostat will be located underneath the gooseneck. Simply lift out the old thermostat, install the new one, and replace the gasket. Reassemble.

Take care

The thermostat will be located either at the upper radiator hose inlet to the engine, or it will be located at the lower radiator hose inlet to the engine.

Remember that the spring end of the thermostat should always go towards the engine, and not towards the hose.

Also with a lower mounted thermostat, when it comes time to add coolant you should dis-connect the upper radiator hose at the radiator and fill the engine through the radiator hose, if you do not then there will be very little coolant in the engine block until the thermostat opens up, and by then your engine could be toast.

Follow the hose that goes from the top of the radiator to the top of the engine. The hose is black flexible, roughly 1.5" in diameter. This hose goes into a "gooseneck" on the top of the engine, secured with a clamp. Remove the clamp and the hose, and remove the gooseneck from the engine. The thermostat will be located underneath the gooseneck. Simply lift out the old thermostat, install the new one, and replace the gasket. Reassemble.

Work on the vehicle cold!! Top radiator hose on this connects to the coolant filler cap gooseneck(no thermostat in here as this is an outlet). The thermostat housing is on the RH side of the engine above the transmission which is the inlet. You will see the LOWER radiator hose running to a pipe and at the end the pipe its connected to the gooseneck (thermostat housing). This is the thermostat location. Be careful with the connectors to the sensors, they may be brittle and will break easily. Hopefully this helps

Yes, there is a "bypass outlet" coolant hose that connects from the water pump inlet pipe (metal pipe that runs from back of water pump along engine block to lower radiator hose) to the intake manifold.

I am not sure about the "black box" - not enough detail.

Drain coolant at the radiator drain. Remove air intake hose and MAF sensor assembly. remove throttle cable bracket and disconnect cable linkage. Remove throttle body bolts and disconnect coolant hoses to throttle body. Loosen heater hose pipe and remove heater hose from rear of pipe. Remove radiator hose from thermostat housing. Remove top thermostat housing bolt. Loosen and almost remove lower thermostat bolt. You will need to slide your wrench and hand under the exhaust crossover pipe to gain access. Loosen the bolt until you can remove the thermostat housing, it should be slotted to clear the bolt. Replace the thermostat and reassemble. Bleed cooling system using the two bleed screws (one on thermostat housing and the other on the passenger side of the engine where the heater hose pipe comes out above the water pump.