hey guys a little while back i had my bt 20v over heating i have sence done research and sam q has helped me out on how to run the cooling system, i have run my cooling system exactly the way sam q has said and also ran the bypass from the top of the water pump to the top rad hose, my issue is around town and at idle it sits at a perfect temp of about 80 deg, as soon as i start to drive or around town it drops to 70 odd deg, but if i hit the high way she will drop to 45 to 50 deg which is shit. now i have a koya alloy rad, ive checked the thermostat and replaced that with a new one no issue there.i have sence put a welsh plug in the top rad hose with a ten mil hole, this has helped as it sits a 80 deg for about 30min but then it starts to drop and eventually and hits 45 deg. i have just purchased an alloy pully kit with an under driven water pump pully, do you think this will help as im thinking the cars water pump is spinning too fast as my car sits on 4000rpm at 100klm as i have 4.7 diff gears?????
any ideas on this