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Hanover Park, IL
You need to check for a parasitic draw. Depending on the size of the draw it can kill a battery in 1 day or 2 months.
Most likely the fuel pump pump is going bad. Will need to check pressure and volume. They go bad right around 100k.
The accident its self would not cause any internal engine damage. However, the accident could damage a component in the lubrication system or in the cooling system. If that happened and your son drove the vehicle, he would have damaged it. Another possibility is it was coincidental that the engine problem started after the accident. Either way the insurance company will not pay for the engine damage. The Pacifica had a lot of issues, hence the reason they're no longer manufactured.
There are 2 tings to try first. Use a long pick and try to unscrew the piece that is still in the differential. Most of the time there is only 1/2 to 1 thread left and it will come out very easily. The second option is to drill it out. There is a special tool kit designed to drill it out. Snap-on, Matco, Etc all make it.
The transmission cam is out of sync. It will need to be replaced and timed. The cam sits on top of the wiper motor. Very common problem.
Yes it is electronic
You need to have it serviced by a certified A/C repair shop.
How do you know it is overheating? Saturn had a lot of problems with the coolant temperature sensors and connectors.
The computer has no way to tell how "hot" the spark is. I would recommend you check fuel pressure and volume.
GM had many problems with the connectors for the temp. sensors on the saturn platforms. Replace the connector clear the codes by removing both battery cables and touching together. Run the vehicle up to operating temperature (until the cooling fan comes on).