Check the functioning of the cooling system and frost coolant fluid replacement

1. Many serious violations in the work related to the engine cooling system fault. If the car is equipped with an automatic transmission, its function and service life are also directly related to the operation of the cooling system.
2. Check the cooling system must be done when the engine is cold, so it's best to do it before the first day of the current trip or not earlier than three hours after the engine is switched off.
3. Slowly, being careful in case the engine is still not completely cooled, remove the reservoir tank cover. Thoroughly rinse the inside and outside with clean water. Also rinse the tank filler neck. The presence of traces of corrosion in the filler neck means that the coolant must be replaced (see. Below). The coolant within the expansion tank must be relatively clean and transparent. If it has a brownish color, empty the system and fill it with new coolant.
4. Carefully inspect radiator hoses, heater hoses and which have a smaller diameter. Check the coolant hoses over the entire length, the detection of cracks, swellings and signs of aging are changing the material. Cracks are easier to detect by squeezing the hose. Pay special attention to location of the fastening clamps which may cut or pierce the pipes that lead to the development of leakage of coolant.
5. Make sure of reliability of fastening of all hose connections. Coolant leaks usually occur in the form of white or rust-colored deposits in breach of the seal. If your car uses a wire-type clamps, it makes sense to replace them with collars of screw type.
6. Use compressed air or a soft brush, clean the front of the radiator (and the air conditioning condenser, where it is available). Remove all insects, leaves and other foreign objects that fall on the fins - be very careful not to damage the edges and do not cut your fingers on them.
7. If the coolant level is constantly falling, and you do not find any leaks, you should make a check of the cooling system pressure conditions HUNDRED Mercedes-Benz.

1. Before the start of the winter season, it is imperative to check the antifreeze concentration in the coolant, especially if the system during operation filled with clean water - use a hydrometer with graduation on frost.
2. Slightly warm up the engine so that the upper radiator hose is hot. When measuring the concentration of antifreeze fluid temperature should be approximately + 20 ?� C.
3. Carefully unscrew the bottle.

When the engine is hot plug the expansion tank should be opened with caution. There is a risk of burns! It is necessary to put on a cloth cap. The stopper is only open at a liquid temperature not more than + 90 ?� C.

4. Dial liquid with a blower hydrometer.
5. In our latitudes, a sufficient concentration of antifreeze that protects the system to a temperature of -25 ?� C, in particularly cold climates to -35 ?� C.

1. Prepare a drain container suitable volume.

2. Remove the expansion tank cap.

3. Open the tap adjusting heater.
4. Remove protection crankcase.

5. Alternately, first drain the coolant from the radiator (see. Conjugated. Illustration of a and b), then from the crankcase (see. Conjugated. Illustration c).
   
   and - Location of the drain valve radiator - tighten the valve on the hose inner diameter of 12 mm (petrol models)
   b - Location radiator drain valve - tighten the valve on the hose inner diameter of 12 mm (diesel models)
   c - Location drain plug of the water jacket of the engine crankcase, - if necessary, use the hose inner diameter of 14 mm

a.

b.

c.

6. Check patency of the cooling channels open areas tract, in case of need make their cleaning.

7. Assess the sealing washers drain plugs, replace faulty washers.
8. After the surge tank fill neck in the required amount of fresh cooling liquid. When driving in conditions of temperature up to -25 ?� C antifreeze concentration in the coolant should be about 40%. When the thermometer is lowered to the level of -35 ?� C concentrations should be increased to 50% (see. Specifications).

9. Start the engine and bleed the cooling tract air pockets (see. Below).
10. Attach the lid of the expansion tank with a label indicating the concentration of the brand of antifreeze and the date of its replacement. Any subsequent replenishment system (up to the planned replacement) should be performed only liquid of the same composition, or distilled water

1. If the replacement fluid motor overheats, the cause is likely in the presence of air pockets in the system. Traffic jams usually occur as a result of haste when filling the system does not violate the serviceability of coolant.
2. The presence of the rubber hoses of the cooling system of air pockets usually simply taped to the touch. After replacing the coolant air pockets usually disappear when you first start the engine.
3. When running to warm up to normal operating temperature of the engine and turn on the heater fan, - the warm air should flow into the interior in sufficient quantities. One reason for the lack of warm air may be present in the path of cool air pockets.
4. The appearance in the cooling path of air pockets sometimes fraught with serious consequences, not only reduces the efficiency of the heater return. Enough volume plug may prevent the circulation of the liquid inside the water jacket of the engine. In order to make sure that there are no traffic jams inside the engine, feel the upper radiator hose: when the engine is running it should be hot. Insufficient heating hose may indicate the presence of air pockets in the jacket, and the possible failure of the thermostat.

1. If after the first engine start after replacement procedure coolant system will airlocks, switch off the engine and wait until it cools, then remove the reservoir tank cover and poszhimayte cooling hoses. In the worst case, the cooling system will have to completely empty and refill with fresh coolant (see. Above).

1. On models equipped with engine series 628 bleed the cooling path is also produced by the activation of the electric motor of the circulating pump (M44).
2. Connect the reader and activate STAR DIAGNOSIS (proceed in accordance with the instructions given in the device manufacturer's instructions).
3. Make the choice of model of the car indicating the type of engine and steering gear.
4. Enter the main group of control units and select the required driver.
5. Specify the type of power supply system (CDI-V1).
6. Select activation mode, as the target point specifying the electric motor of the circulating pump (M44).
7. To activate the pump, press the function key ?�F3?�, - the pump will operate only when the key is pressed.

1. Remove protection crankcase. Drain the cooling system (see. Above).
2. Remove the thermostat cooling system (see chap. System of cooling, heating, ventilation and air conditioning).

3. Using pliers, remove the retaining plate (6), and then pulling down and simultaneously turning, remove the casing (4) thermostat operating element (5). Further cover may be used as a tool for the removal of the oil cooling system.

4. Turn on the heater for maximum performance (see. Some devices provide comfort), with appropriate equipment activate an additional heater (ibid.).
5. Pour in a special cooling the wash solution (5% concentrate, 95% water).
6. Run the engine at moderate speeds warm it to a temperature of 80 ?� C (take about 5 minutes).
7. Stop the engine and let it cool down to a temperature of about 50 ?� C.
8. Drain the solution from the cooling system (see. Above).
9. Fill the cooling system with clean water for 5 minutes, start the engine and then shut off again and drain the water.
10. Fill the cooling system with fresh coolant, remove the cooling air path (See above.) And inspect the system components for signs of leaks.