Hi,
Recently, I had the thermostat and gasket changed because the coolant was leaking from there. It didn't fix the first time, so I went back to the dealer again and did a pressure test. No leak was detected.

So, they put a bright-green dye in and it leaked again. It probably have been leaking very slowly over a few days to see what's happening.

What can I do to help my technician to fix this?

Thanks,
Shane

http://us.f1.yahoofs.com/users/52c4d4ca/bc/Explorer/coolantleak.jpg?bcbHJN.A4waZr###

If the bright green dye is a flourescent dye, the tech should be able to use a black light source now to see where the leak is coming from. You could also do this with a black light.

See this thread on A/C dye: http://www.explorerforum.com/forums/showthread.php?s=&threadid=57468&highlight=dye