Hi,

I have an issue with a coolant leak on my car. It's a bit odd if I'm honest.
The leak only occurs from the left side not far from the tank, after I drive the car for a while or when I drive erratically.
Once the leak stops, I'll immediately refill the tank with water and the leak stops...

The video attached may not show much so I do apologise. (for some reason I can't add a second video but that was showing the leak from underneath.)
Any help would be seriously appreciated, thanks.

 

That appears like a radiator seam...but the video doesn't show very much to tell.

 

What would that mean? What could be the fix? New pipe, new radiator?

I'll try taking more videos when the leak occurs again.

 

Unfortunately, if its a seam, it would mean removal of the radiator. But, it could be a minimal cost repair for a radiator shop and all they have to do is solder it, pressure test it, and your good to go.
If the radiator would have to come out, a detailed inspection of your hosing and replacement of weak hoses, would be highly recommended. This should be done in any case.

 

Difficult to solder as the core is aluminium and the side covers are plastic.