[Rob175]

If you think its similar to mine then:
1. Pull out all of the trunk liners (very easy)
2. Pull the raised floor panels (very easy)
3. Look for small areas pooling of coolant (it's possible that it might have evaporated or seeped out from a joint)
4. I wrapped the plastic coolant tank with a few layers of paper towels and drove the car for about an hour, until it was nice and hot.
5. Afterwards I pulled off the towels and discovered a few spots of wetness and coolant stains.

At that point I knew I needed a new tank. From the reading of other postings, I ordered a replacement from Porsche thru my "indi" Porsche mechanic. (I was advised to avoid the lower cost aftermarket replacement tanks). All in, the tank, the labor, a couple of new hoses and clamps were about $900. I understand that some do it themselves but without a lift it's a much harder job, so I paid to have it done.

My car is a 98' so the plastic tank was 22 years old....btw, I also replaced the old blue tank cap with the newer part number too.