IN instrument clusters every car has a coolant temperature gauge. If the engine is overheated, the gauge needle approaches the red zone.
At the first signs of overheating, if the temperature gauge needle has moved into the red zone, but no clouds of steam are escaping from under the hood, fully open the heater valve and the air intake control flap, and turn on the heater motor at maximum speed.
Turn on the hazard warning lights, press the clutch pedal and, using the car's momentum, try to carefully move to the edge of the roadway and stop as far to the right as possible at the side of the road, and if possible, outside the roadway.
Let the engine run for a couple of minutes at normal idle speed with the heater on full blast.
Warning! Do not stop the engine immediately! The only condition is to maintain the tightness of the cooling system. If the hose bursts or comes off, or another leak occurs, except for the liquid ejected from under the expansion tank cap, the engine will have to be stopped immediately!
After an overheated engine stops, local overheating of the coolant begins in the places where it contacts the most heat-stressed engine parts and vapor locks form. This phenomenon is called "thermal shock".