Originally Posted by RichardV6
Originally Posted by Neilda
My 4.8 runs cool in hot weather and quite hot in cold weather.

It's around 90 when very hot (I had a month in Provence this year which was very hot) and around 100 when it's cold.

Too much hysteresis in the coolant temperature control. There have been similar issues when more efficient after market aluminium radiators are fitted, actually increasing engine temp under certain motorway conditions. Cure I believe was an alternate thermostat.

Note not all thermostats of same quoted temperature are equal. I had an overheating issue with a boat diesel engine cured by a higher temp thermostat because it started opening 14°C below its listed temp.


Indeed. I tend to treat the guage as a vague indication of warmth, and the LCD as perhaps a more accurate read of whether the engine's 'ready to do some work', or perhaps 'hotter than I might expect'

... there's also the auxiliary radiator in play here, which does sometimes produce counter- intuitive 'runs cooler on a hot day'

Will

Formerly Aero S5 #80
Currently 911 (992) Targa in python green