Underneath the car, after parking it elsewhere


Hey guys, I have a 2007 Nissan 350z that's heavily leaking radiator coolant (as you can see in the photos), but I can't pinpoint where is it coming from exactly. About 2-3 months ago I replaced the thermostat, did a radiator & overflow tank flush/clean & checked/cleaned all the hoses.

Last week I took my car to a mechanic to replace the ball-joints & some lower arm bushes, that's when I noticed that the coolant was leaking so bad, it was dripping on the floor while the car is in motion . The mechanic checked the radiator & hoses for any leakages/holes, but there wasn't any. However, I did notice that he filled-up the overflow tank way beyond the max mark, nearly a full tank . He then told me the coolant drips could be due to that, as it's getting rid of the excess coolant. So I was like ok & I went home.

On my way to work yesterday, before I started up the car, I notice this pool of coolant on the floor (that you see in the photos) , but I didn't have the time to check it, so I went to work & When I came back, I opened the radiator cap & noticed that it was empty dry, which is very unusual , so I refilled it, started up the car & let it warm up for 25-30 mins, while keeping an eye out for any leakages from underneath it, but there was none & the temp. gauge was normal (below half), so it wasn't overheating.

I then turned it off & went home, came back like 2 hours later to check the coolant level in the radiator, but I dropped the cap in the gap between the radiator & the engine block . It took my like 40 mins to retrieve it, after having to jack-up the car, remove the left wheel & get my hands on the lower pan underneath the car. I noticed then that there were coolant marks, drops & small puddles on the pan from the inside.

When I refitted the wheel & dropped the car back down off the jack, I noticed that the coolant leaked again & made a new big puddle from the right-hand side of the car (the passenger side) . I opened the radiator cap to check the coolant level & it was empty again .

What could be the reason for this leakage & how can I resolve it?

 

could be a cracked radiator... go get the dye to pinpoint where it is coming from

 

Also, how old is the radiator cap? We all tend to forget them, but they do require regular replacement.