Right recently been having problems after fitting a new Rad (standard glanza rad), got it sorted a few days ago went for a 60 or 70 mile drive and the coolent temp gauge started fluctuating, Ok so i got a new thermostat just fitted it went for a drive but noticed the pipe from the rad to the thermo housing is very cold even after a 20+ min drive, but before fitting this i can remeber it being fairly hot, just want to know if this is right to be cold or if i have a problem what is likely to be the cause?? + the rad was bled for air after fitting new thermo + radiator is hot after a drive