I have a 2010 Sport Coupe 6mt with about 103,000 on it. I have coolant leaking from the driver's side of the engine. I can see the coolant dripping from the bottom of the a/c compressor. I can't find the leak. I've taken my intake off, fender liner out, and used my phone as a scope to try and find the source of the leak. It only leaks when the car is running. Any ideas?

 

Buy the u.v additive and put it in your coolant and the u.v pen light will show you where your leak is coming from most auto parts stores carry this

 

pressurize the cooling system and see where it is coming from.

 

https://www.myg37.com/forums/engine-...-location.html

might have same leak as mine. planning to look more thoroughly this weekend, hopefully.

symptom: car runs fine. coolant reservoir missing coolant (minimal).

 

That's about the same spot mine is leaking. It turns out it's my rear timing chain cover gasket. Yay! $2,000 repair!!!!

 

When the rear timing chain gasket leaks, it does not leak externally and it leaks OIL, not coolant. So I don't think that is your issue.

The good news is that coolant leaks are generally not hard to find. Wipe all hoses clean, add UV visible dye and use an UV light to spot the start of the leak.

You mentioned that it only leaks when the car is running. However the cooling system will stay pressurized for a few hours until the car cools down to ambient temperature. Are you sure it is coolant?