Hello and thank you for choosing Just Answer.
You need to replace the whole oil pan gasket, then apply gasket maker (the red one) around the oil pan gasket. That should seal it up.
just that ,red sealant ? and where can i get that ?
and what about the radiator fan issue in number 2?
That would have to be the radiator fan switch. This fan is mounted on the radiator and it turns the fan on/off.
Here is what it looks like: