Hi folks, took delivery a 1994 SL320 on the weekend. 133k km (82k miles). Searched the forum and found similiar problems or solutions but not quite the same so I'll post. The first part of the trip home was a ferry ride and 200 km of highway. No problems, what a car! Temp sitting rock solid at 85-90C. As soon as we got into a city, stop and go driving within 10 minutes the temp gauge is floating between 115 and red line with the 2 electric cooling fans kicking in and out. We stopped, let things cool down, checked coolant level which was fine. Cooling system serviced and tested to -50C by MB in 2005 according to the MB tag wired onto overflow reservoir hose. There was residual pressure at the cap on the tank. I don't know which type of fan clutch is used on this model but even when the engine was indicating hot, I can easily hand spin the main fan (engine off of course). Where should I start looking? I was going to pull the thermostat and run without it and check it in hot water but some are saying a MB shouldn't be run without it. The serpentine belt is in great shape, good tension and the water pump visually looks fine, no leaks or siezing. I'm 3-4 hours from the nearest dealer and a reasonably competent DIY'r, just new to MB. Any advice appreciated.

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1994 SL 320 White