Mercedes S-Class W-140

1991-1999 of release

Repair and car operation

Check of functioning of system of cooling and frost resistance of cooling liquid, liquid replacement

Address also to Section materials Check of a condition and replacement of hoses of an impellent compartment, localization of leaks

Many serious violations in operation of the engine are connected with malfunctions of system of cooling. If the car is equipped with automatic transmission, its functioning and service life also are directly connected with work of system of cooling.

Check of system of cooling should be made at the cold engine therefore it is better to be engaged in it before the first trip for the present day or not earlier than in three hours after engine switching off.

Slowly, being careful in case the engine yet absolutely cooled down, uncover a broad tank. Carefully wash out it from within and outside pure water. Also wash out a jellied mouth of a tank. Existence of traces of corrosion in a jellied mouth means that cooling liquid follows will replace. Cooling liquid in a broad tank should be rather pure and transparent. If it has brownish color, empty system and fill in in it new cooling liquid.

Hoses, also as well as driving belts, have property to fail at the most inappropriate moment - in order to avoid the troubles connected with a rupture of hoses of a radiator or a heater, attentively examine them, as is shown in an illustration

PERFORMANCE ORDER

1. Carefully check radiator hoses, and also hoses of a heater which have smaller diameter. Check hoses of system of cooling on all length, making replacement of any burst, blown-up or worn-out hose. Cracks are easier for finding if to compress a hose a hand. Pay special attention to the collars holding hoses on components of system of cooling. These collars can cut or pierce hoses that will lead to leakage of cooling liquid.
2. Make sure of reliability of fastening of all shlangovy connections. Leakages of cooling liquid usually are shown in the form of white or rusty color of deposits in the field of sealing violation. If on your car collars of wire type are used, it is meaningful to replace them with collars of screw type.
3. By means of the compressed air or a soft brush clear a forward part of a radiator (and also the condenser of the conditioner of air where it is available). Remove all insects, leaves and the other extraneous subjects which have got on edges of a radiator, - be very careful not to injure an edge and not to cut about them fingers.
4. If level of cooling liquid constantly falls, and you did not find any leaks, it is necessary to make check of system of cooling by pressure in conditions HUNDRED Mercedes-Benzs.

Check of frost resistance of cooling liquid

Do not allow antifreeze hit on your skin and the painted surfaces of the car! At hit immediately wash away a plentiful quantity of water.

Antifreeze is extremely toxic and mortally dangerous at hit in an organism.

Do not leave antifreeze in the open container or spilled on a floor; its sweetish smell can easily involve in itself children or pets.

Consult about local rules of utilization of the fulfilled antifreeze. In many areas there are special centers for its acceptance.

PERFORMANCE ORDER

1. Before the beginning of a winter season it is necessary to check surely concentration of antifreeze in cooling liquid, especially if in system pure water was in use filled in, - use the areometer with graduation on frost resistance.
2. Slightly warm up the engine so that the top hose of a radiator heated up. At measurement of concentration of antifreeze the temperature of liquid should make near +20°С.
3. Carefully unscrew a stopper of a broad tank.

At the hot engine the stopper of a broad tank should be opened carefully. There is a danger of a burn! It is necessary to put a rag on a stopper. A stopper open only at liquid temperature no more + 90°С.

Gather liquid by means of an areometer pear.

In our widths the concentration of antifreeze providing protection of system to temperature - 25°С is sufficient, at especially frigid climate to - 35°С.

Liquid removal

PERFORMANCE ORDER

1. For removal of cooling liquid place the pallet under a radiator and unscrew a stopper of a drain opening of a radiator.
2. Completely to remove old liquid from system it is impossible (without complete dismantling of the engine) therefore all volumes specified in Specifications are conditional. In practice you can fill in about 2/3 ordered amounts of liquid in system.
3. After system filling by fresh antifreeze place on a broad tank a label with the indication of concentration, brand of antifreeze and replacement date. Any subsequent replenishment of system (before planned replacement) should be carried out only by the specified liquid.

Antifreeze addition

Address to materials of Specifications at the beginning of Head.

In need of protection of the engine to temperature - 25°С concentration of antifreeze in cooling liquid should make 40 %. In need of protection to temperature - 35°С concentration of antifreeze should make 50 %.

If higher extent of protection against freezing is required, it is possible to raise level of concentration of antifreeze to 60 %. Such concentration will provide protection to - 40°С. If concentration raises to higher level, extent of protection of the engine starts to go down and, besides, heat-removing properties of cooling liquid worsen.

Air jams

If after liquid replacement the engine overheats, the reason, most likely, available air jams in system. These jams do not allow liquid to circulate on all system. They appear as a result of too hasty filling of system.

PERFORMANCE ORDER

1. If you consider that in system there are air jams, first of all try to compress in turn all available hoses of an okhladitelny path. You define at once, the hose is filled with liquid or air. As a rule, all air jams disappear after the first (after liquid replacement) engine start.
2. At the working heated-up engine include a heater and its fan. Warm air should arrive in salon in enough. If the temperature of submitted air low, the reason, probably, is an air stopper.
3. Consequences of emergence of air jams in system can be very serious (not simply decrease in overall performance of a heater). The big stopper can stop liquid circulation in the engine. To make sure of lack of jams in the engine, touch the top hose of a radiator at the working engine - it should be hot. If the hose cold, it testifies to existence of an air stopper in the engine or about the faulty thermostat.
4. If you could not get rid of air jams, allow the engine to cool down completely, uncover a broad tank, try to compress system hoses. If it did not help, merge all cooling liquid in the pure container and again fill system with the same liquid, following the recommendations provided above.