2010 Panamera 4S, with 90k miles.
I replaced the radiator due to a hard contact with a parking lot cement barrier. After reassembly, I have a leak at the lower left (drivers side) large hose connection to the radiator. Tried gasket sealant, no help. Tried a new o-ring, no help.
Could it be the radiator. It was a great priced one off ebay. It is tagged made in china. Should of purchased a Behr brand radiator?
Or, should I try a new lower hose assembly?

Any help is appreciated, Patrick

 

I'd try to source a new metal clamp, then hose. Good luck! (Luckily me and mine have not hit anything requiring radiator replacement)...

 

The hose from the engine to the radiator has a metal cover over the end and a o-ring on the metal to seal the hose to the radiator. It is a one piece part that locks into the radiator with a spring clip.

 

I solved the leak problem by replacing the inexpensive radiator with a new Behr brand radiator from a reliable vender. I should of known better - always pay the extra amount for a Porsche branded part.

I also ordered and installed new supply and return tubes. After installation, no antifreeze leaked or dripped from the hose to radiator connections.

Part numbers:
Radiator 97010613103
Return tube, left side 97010623101
Supply tube, right side 97010623201

If I had to do it again I would order new radiator screws. The torx head screws wore down after my extra radiator exchanges.

The whole process with the right parts took about 6 hours.
I found Porsche workshop manuals on the internet that a followed. I was able to remove the radiator without disconnecting the AC condenser. I also did not need the antifreez coolant tool to add coolant to the radiator. I prefilled the radiator before starting the engine and closely watched temperature while adding coolant to the recovery tank.

Here is a pictue of the original damage.