My fan cuts in but now not till it gets to very top of the o! But doesn't cool it down just keeps it at o which is very unlike my car as new sensors from msd 500 cooler and alloy rad. Car is saph cossie 2wd stage 1. Cheers

 

maybe not getting full power to the fans? not sure myself if they would turn slower or just not work but maybe worth a look

 

Did you change the sensor in the head that tells the gauge what to do? Did you replace it with the same colour as the one you removed? Lots of people having the same problem and this is the cause of most of them

 

Make sure fan is turning correct way