Most expensive engine damage begins as a cheap leak. Coolant and oil both give you warning before they cost you an engine.
Radiators, hoses, water pumps, thermostats and head gaskets all set off the same dashboard warning. Which one it is decides whether this is a small job or a large one, and that gets established before a price is discussed.
An oil leak is usually a seal or a gasket rather than the part it appears to be coming from. Oil travels before it drips, so finding where it actually starts is most of the work.
An overheating engine can go from an inexpensive repair to a replacement in a single drive. If the temperature gauge is climbing, stopping costs less than continuing.
If it has been hit and it also needs mechanical work, it does not need to go anywhere else.