Your gurgle will be an air lock they can be very difficult to chase out the system. I still suspect the stat is either opening late or not fully opening. If the weather down South is even 10 degrees warmer than up here, just now, I would not expect the car to be getting that hot in traffic in the summer yes I would expect the car to be calling for its fan every five mins in the town. Have you access to a digital sight thermometer to check on temperatures.
It could be the sensor is off. If you want a lone of one PM me and I will stick one in the post all I ask is when you are finished you return it. If you do want to borrow I will get one of the grand kids to go into the bowels of the garage and look for my engine diagnostic pit lane box I think there may be some colour change temp strips still in there if they are there and are in the correct temp range I will stick them in and you can stick them to the engine which will give you the block temperatures. Better on your car than in a box hiding for twenty years.
Alan
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