RepairPal Certified shops can diagnose and repair your 2004 Porsche Cayenne. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Unless your coolant is so dirty that it is clogging up the system that is not the reason you are overheating. This could be a few things like a bad engine fan, thermostat, clogged radiator, bad water pump. All of these would need to be inspected by a qualified technician to diagnose the issue. If you don't work on your own cars here is a link to find a good shop near you,
https://repairpal.com/repair-shops
Alex
Why would the entire car shut down? The steering wheel became impossible to turn and the battery generator message came across the message screen
Found out the serpentine belt broke