i have a temp alarm on my 300 and i bolted it to the side of the block towards the rear [drivers side] and up here in the tropics it runs at 68 or so when puttering around the bush. when i drive it out to katherine [700km dirt @ mostly 70-100km/h] it gets up to 85 and spikes when i stop and idle to around 90 degrees. that is in mid december during the build up. couldn't get much hotter ambient temp than that. mine is getting a flush as the coolant looked a bit brown when i got to darwin.
