I know the thermostat is supposed to open at 88 degrees, but mine is obviously opening sooner than that. As mentioned a few days ago, my temperature gauge has gone intermittent and as I had a trailer towing trip over to France last week, I plugged the Nanocom in to keep an eye on the temperature. Seems I'm running at a steady 85 degrees, saw 87 once while slogging up a hill and 81 when coasting down the other side but even after being stuck in traffic for an hour (in the UK, that sort of thing doesn't happen the other side of the Channel), it sat at a steady 85-86, never getting any hotter than that. OK, so I've got the Direnza alloy radiator that has 50% greater capacity than standard, it's filled with the required 50/50 mix of Ethylene Glycol anti-freeze, a relatvely newish (about 3 years old) Airtex water pump and a two year old viscous coupling. So the cooling system is in good nick but is running at these sort of temperatures something I need to do anything about?