I noticed red coolant drippings on ground on the driver side. I went down the car and found this:
I see dripping on the lower radiator hose. But where is it leaking from??
Maybe it's because of the curb... that day I didn't apply the parking brake tough enough when we left the car (on a slope).. The gravity showed itself when we were going home. So both of us were seated, and I shifted the gear to neutral preparing to start the engine. But then the car slipped forward on the curb.. And the car was barred by the curb so I was not able to back the car. Some people came and help trying to lift the front end a little bit while I giving gas to back up..
Come to think of it, maybe one of the pipes were damaged at that time. Does it have something to do with the thermostat and/or housing, crack pipe..?
I'm going to replace these things next week. It's too bad if they're actually not the source of leakage.