Change battery battery location? and how to change? Does it need to rest the computer?

Pull battery cables then touch the cbles together it discharge any remaing power let sit for ten min hook cables back up

The Thermostat is located under the return water hose coming from the radiator and going into the engine block.
1. disconnect the negative battery cable
2. drain the radiator fluid into a container, at least part way.
3. locate the top hose
4. you do not need to remove the hose if you can get to the blots, just remove the blots
5. gently rap the cap with a rubber, leather or brass mallet.
6. remove the thermostat, clean off all gasket material
7. install the new thermostat and new gasket
8. revers order the rest, refill the coolant, reconnect the neg batt cable.

get your computer reset, all you have to do is disconnect the battery posts and tape them together for 5 min's and it'll rest your computer...

rest?
what computer?
PCM. TCM/ which function are you trying to do actions to.?
or just flat state the symptoms, let those facts dictate actions.

I know this is an old post but may help others

The PCM in my 2006 Ford Fusion is below the battery against the firewall.

You will need to remove the bracket holding the battery, the battery, and the tray that the battery rests on.

The PCM is held to the firewall with 4 bolts and I believe they are 10mm. Remove plugs and unbolt.

The large red wire going from the alternator to the battery is actually a fuseable link. It has a section that is designed to melt just like a large fuse. The section is thicker than the rest of the wire.
You can buy a replacement section, but it may need to be soldered in place to carry the amperage. You may also be able to use a maxi-fuse in place of the fuseable link.

make ,model ,year?????
Contact dealer -they should give you the code for free but if it requires resetting by a computer than you will have to pay them.

if you have changed or added a chip to increase the horse power, or upgraded the system, yes you need to have that rest , if the battery gets low or dies, it will revert back to the default settings that were set up for that vehicle, If you take it to a ford dealer and show them what chip you have inserted , they can make the necessary adjustments

Check the fuse's first. If you changed the battery there is a chance you shorted it to ground and may have blown some fuses. Do this first.

It would be best .....as on all cars made after 2000 to keep voltage in the system when changing the battery.
If you have a battery charger attach it to the alt output connection and place it on it's lowest setting,usually 2 amps.
Now you can change the battery without memory circuits causing problems.
You can also buy a 9volt battery adapter to plug into your accessory power outlet to keep voltage in the system when disconnecting the battery.
Otherwise.....some circuits may require resetting after 0 voltage is present.....the engine computer will relearn it's settings quickly.