A few days ago after car battery change this thing unplugged. Since then the temperature of the coolant on the dashboard goes up and down really fast. Could it be related and
Amazon.com: Artudatech Battery Fuse Box Socket Holder 6R0937548C 6R0937548F for Lavida Bora Polo Skoda : Automotive
Battery for SKODA Octavia II Hatchback (1Z3) 1.6 TDI 2009-2013 Diesel 105hp CAYC