My 1200LTD always runs at 6 bars, summer and winter. I have it rigged up so I can either let the fan cycle, or bypass everything and let it run all the time. That is usually for stop and go traffic in the summer. The only time it has gone above 6 bars was back a while ago when I was having serious overheating problems with it on startup. Totally different from your problem however, mine would boil and blow coolant out the radiator cap about 5 minutes after a cold start. I checked everything, and never actually did find the cause. I suspect it was air trapped in the engine. It is running fine now.