I installed a center radiator kit from our host back in August and didn't have any problems at that time or for the rest of the season.
I noticed a small pool of coolant under the front of my '99 996 C4 176,000 miles yesterday:-(
Today with the car up on stands I can see that the leak is from the drain fitting at the lower left corner. I could just barely access the plug but could tell that it is firmly seated.
Once I stripped the front bumper off ( might as well clean the radiators again, right?) I couldn't get much more rotation without over torquing the plug. No improvement, still a weep without pressure in the system.
Pulled the plug and the o-ring looks good, no pinches, twists, or nicks. there is an alum washer seems to be intended to let coolant pass when the plug is loosened.
Any suggestions what to do? Second o-ring replacing the alum washer?
Thanks