You loved ones I have been on the highway today with my Gustav (Bj. 96, 300′ km, 126hp 10V Automat). In traffic jam the engine temperature went up at once, from 3 o’clock to about 1:30 o’clock. From this point on the cooler used (or what I think it is), which makes the temperature again at 3 o’clock. This is so in 5min clock. When driving free then without problems, even no other topics, in the workshop recently no faults in the store. Problem I had already in November (also traffic jam). In April (also traffic jam) was funnyly nothing. Do I have to worry about it? Can I drive for a while?