Having a really weird issue with my 156 at the moment;
Every now and then i come across a puddle of coolent under the rad, and when i check the level has either not perceptibly changed, or dropped a little (i topped up with maybe 200ml this morning.) But it may be weeks before the little puddle shows itself again?
Car doesn't over heat, and checking regularly i don't seem to be loosing any between the puddles appearing. Any ideas?