Cooler fan, strange behavior

Hey guys, my little one made me light problems yesterday. First again to the vehicle, It’s nn 406, built in 1998, 152tkm 2.0L gasoline RVY., switch. Now to my problem: Yesterday we went to a slightly larger city with a lot of stop & go. Of course, in city traffic the cooling water temperature rises to about 90-100degree C. Okay all good so far, but then the ****** fans just don’t start to run. I do the air conditioning because i have The fans are running as well. Mistakes Ok meanwhile the traffic lights turned on green & I have windows down and heating fully on! Off into a side street. Start the dock until the interior heating has cooled the vehicle to some extent to 100 degrees C down. Okay what do now? just thought to start the car anew! JAAA at once go on fan at level “zerhacker” & the car has driven backwards soon as much as the bubbles have D Well okay continues for the first time, because no loss of cooling liquid visible, we drive on again. At the finish Arrived Ersteinmal cool down. After the visit to the Greek & miserable food I once let the car warm up. Normal goes with the air conditioning the fans, at about 90 degrees C small level on, just before 90 degrees the middle & then nevertheless the very big level! Pfect as it should be! But what was that one time? Wanted soon on vacation in the mountains with Do you think that a relay has hung or something? Greetings