Ask the ex­pert

Total 911 - - Views - Scott Gard­ner

Got a ques­tion for our Porsche tech­ni­cian? Email us edi­to­rial@to­tal911.com

Q: I am presently the very proud owner of a 991.1 4GTS coupe with a PDK trans­mis­sion. My car has a cen­tral ra­di­a­tor. How­ever, I no­ticed that the new 991.2 GTS lacks the cen­tral ra­di­a­tor in USA spec­i­fi­ca­tion.

My first Porsche was a 997.1 2007 C4S with a Tip­tronic trans­mis­sion. That car also had a cen­tral ra­di­a­tor. How­ever, I no­ticed that the cen­tral ra­di­a­tor was deleted from the 997.2 gen­er­a­tion C4S. I have searched for ar­ti­cles on the sub­ject of Porsche 911 wa­ter-cool­ing and I could not find an an­swer. Why is it deleted from cer­tain mod­els?

Julio Quin­tero

Scott’s an­swer: “The wa­ter-cooled 911 range does vary for cen­tral ra­di­a­tor fit­ment and is purely down to the spec and model. Gen­er­ally, most PDK and Tip­tronic cars do run them but they can vary de­pend­ing of the spec­i­fi­ca­tion and model year. When the 991 gen­er­a­tion was re­leased, we found they had ther­mal man­age­ment sys­tems built in and ac­ti­vat­ing Sport Plus can vary the cool­ing op­er­at­ing tem­per­a­tures, so a third ra­di­a­tor would be in­stalled to help man­age those tem­per­a­tures. Most AWD 911s have a cen­tral ra­di­a­tor with Sport/sport Plus. The higher per­for­mance 911s, like the GT range and Tur­bos, also run one to aid the cool­ing sys­tem. Coun­try cod­ing also may be a fac­tor due to hot­ter cli­mates.

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