Strange coolant leak

[robucop]

Since the car is going for it's MOT tomorrow i thought I'd let her run this evening for a while to make sure i wouldn't have any surprises tomorrow. As i walked to wards the car i noticed a lot fluid on the floor under the radiator, it was actually dripping down but i couldn't see where exactly it was coming from. So i started the car and checked again but still couldn't see the source. The leaking eventually stopped but the car was starting to run a bit hot so i shut down the engine. I then got some more coolant and filled her up again and started the engine, i looked again for the source of the leak, this time with a lamp, but it had stopped leaking all together. I let her run for 15 minutes and then took her for a short spin but the leak didn't come back and it wasn't running hot either. I'm stomped, have any of you seen anything like that before? I kinda don't trust her any more....

[robucop]

Checked this morning as the engine was cold, no leaks.
Started her up, let her run, drove to the MOT station, no more leaks.

Weird.....

[Arizona_928]

Prolly the tank gasket at the radiator, running it heats it up, swells, and seals? lol look at the fins for corrosion.

[robucop]

Originally Posted by AZ_porschekid

Prolly the tank gasket at the radiator, running it heats it up, swells, and seals? lol look at the fins for corrosion.

Thanks, i assume you're talking about the gasket between the radiator and the plastic end tank?

[Arizona_928]

Originally Posted by robucop

Thanks, i assume you're talking about the gasket between the radiator and the plastic end tank?

Yep yep

[SanDiego928]

I had a small leak appear Jan 1 2012, passenger side top, end tank. Almost replaced the end tank but my rad had too many repairs already; went for a used radiator from 928 intl.

This was by far the easiset thing I have ever done on a car, replace a radiator in a 928.

This will not be a problem for many years.