strange one but today i finally did the thermostat on the golf, was going to do the temp sender just for the sake of it but i got the green plug but need a blue one (fail)
anyway left the temp sender alone and topped the car back up with coolant and started it (coolant level light came on and beeped and flashed) and i let it warm up until the fans came on always topping the resivior up
left it for 4 hours whilst i wired in my new sub + amp (took me 5 mins the get the cable through the firewall into the cabin and down the side of the car, yay me!) then started it again and the coolant/temp level light flashed back up and beeped again, checked the coolant level and it was fine (between min/max)
any ideas as to why its doing this now? gauge does run up to 90 and sits there no problems