Kent, the heat comes from what is refered to as heat soak. When the engine is producing heat, the water is circulating and cooliing it off. When you turn off the car you turn off the pump as well and the heated cylinders and the water around it do heat soak and increase the temps by as much as 20 degrees Celcius.
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM