2. The cooling system should be checked with a cold engine. Perform this operation before operating the vehicle or not earlier than 3 hours after turning off the engine.
3. Remove the radiator cap by turning it to the left until it stops. If you hear a hissing sound (indicating that there is still excess pressure in the system), wait for it to stop. Then press the stopper with the palm of your hand and keep turning it to the left until the cover can be removed. Rinse the cork thoroughly (inner and outer side) clean water. Clean the radiator neck. All traces of corrosion must be removed. The coolant inside the radiator should be relatively clear. If it is painted rusty, the liquid should be drained and filled with fresh (see section 29).
4. Check the entire length of the upper and lower radiator hoses, as well as all heater hoses (smaller diameter), which go from the engine to the heat-insulating partition. Check each hose along its entire length and replace any that show cracks, kinks, or signs of wear. Cracks may become more visible if the hose is compressed (see illustration).
9.4. Hoses, like drive belts, often fail at the most inopportune times, so check them carefully, as indicated here
5. Make sure all hose connections are tight. A leak in the cooling system usually shows up as white or "rusty" colors in areas adjacent to the leak. If wire-type clamps are used on the ends of the hoses, it is recommended to replace them with safer clamps with screws.
6. Use compressed air or a soft-bristled brush to remove insects, leaves, and other debris from the front of the radiator or air conditioning condenser. Be careful not to damage the thin cooling fins or cut yourself.
7. Perform a pressure test of the cooling system after every maintenance. Do the same at the first sign of a malfunction in the cooling system.