Engine Cooling System problems of the 2006 Porsche Cayenne

I own a Porsche, Cayenne s 2006 model. I was traveling to las vegas, nv from home (garden grove, CA) . All of sudden there was coolant check signal came on so I have exited from freeway and added more coolant. However the coolant check signal wouldn't go off and the temp went up so high that I had to pull over to the side of the road. Make the story short, my whole family spent next 5 hours out on 110f sunlight without ac. I have found out that coolant pipes were made with plastic which cannot withhold the heat which vehicle generates. And although Porsche has changed the parts to aluminum they still haven't recalled these vehicles. They, Porsche, are aware of this issue and yet they are not recalling these vehicles. Also they are not willing to pay for my repair. Although there wasn't any injuries at this incidents but we could have been in serious trouble due to dehydration, especially 2 of my kids (12y & 13y). What if other family gets stranded without any source of help. I would be greatly appreciated if you could help me with this issue. Thank you.

2006 Porsche Cayenne. Consumer states coolant leak and problem with having the vehicle serviced the consumer was informed by his mechanic that he needed to take the vehicle to a dealer, because a technical service bulletin had been issued for the problem. The vehicle was taken to the dealer and the problem was confirmed. However, Porsche only offered to cover the cost of the parts. The consumer learned the original coolant pipes were made of plastic.