Been driving the 968 for 3 years and didn't know i had a problem .
turned out that mij fan switch (radiator one ) was not turning the fans on at low speed .
Since i drove the 944 for many years (type 1 ) where the fan only kick's in when the temp gage almost reaches the end off the scale , it never botherd me a bit , that the 968 did the same thing .
Only thing that botherd me was that after 30 min or more off slow driving (traffic city) the car seemed to get very hot even with low outside temperatures .
Tested the system with the DIY for the cooling system , didn't even get my hands dirty .
Thanks