I do tend to agree with you whools, i drove my mk2 escort for 11yrs using a mk2 cortina radiator, (bigger header tank) ran coolant all the time and only flushed when a new pinto went in. ...3-4yrs , temp never got above 1/3rd even on killer hot days jammed in gridlock. ..i used a manual thermo fan switch at long traffic halts only.