Why does the Suzuki Grand Vitara engine get hot? Symptoms, thermostat

Suzuki Grand Vitara cars with 1,6-liter M16A engines and 2-liter J20A are deservedly considered one of the most reliable and durable. Small troubles, such as the thermostat breakdowns and some other problems in the cooling system, are easily corrected. How to change the thermostat to Suzuki Grand Vitara 1.6- and 2.0 l, which is better to put and all the subtleties of the replacement will find out right now.

Why Suzuki Grand Vitara is heated. Signs of failure


The thermostat malfunction on Suzuki Grand Vitara is primarily manifested in the instability of the engine operating temperature. Noticing deviations from the usual work of the cooling system, it is desirable to check as much as possible, otherwise you can get into serious repairs. First, the engine overheating negatively affects the resource, secondly, the power drops, thirdly, the flow rate of gasoline is growing.

The normal operating temperature of the engine for Vitara is 89-97 °C. Work on a cold engine either does not bring anything good. Especially in winter, since the engine may experience oil starvation, and this leads to reinforced wear of the connecting rod-piston group, the head of the block and the root liners of the crankshaft.

термостат сузуки витара

If the engine overheats, there may be several reasons:

  1. The thermostat valve jammed and does not let antifreeze in a large circle through the main radiator. Worse, when the thermostat caught the wedge in an intermediate position, then the malfunction to identify more complicated.
  2. Low antifreeze. It is easy to check, while you need to make sure that there are no flows of liquid and other problems (hitting antifreeze into the lubricant system, for example) and only then add to the level.
  3. Airlock. Pretty frequent phenomenon. It occurs when the motor overheating or depressurization of the cooling system, as well as when the antifreeze is incorrectly replaced. How to remove an airlock from the Suzuki Grand Vitara system we understood here.
  4. Water pump does not create the desired pressure. Nominal pressure in the system of about 100 bar.
  5. Antifreeze is worn and does not fulfill its functions. Old antifreeze makes more harm than good, so we change the muddy, grilling and dirty cooling fluid as soon as possible with a possible washing of the system.

However, the complaints are most often presented to the thermostat.


How to check the thermostat on Suzuki Grand Vitara


First, learn the main operating parameters of the thermostat. For both motors, 1.6 and 2 liter, they are the same:

  • The temperature of the opening of the thermostat of 80-84 °C;
  • Full opening temperature 95-97 °C;
  • The total stroke of the valve rod is at least 8 mm at 95 °C.

Check the thermostat for performance can not be removed from the car. In the case when the motor is constantly overheated, the valve can jam in a closed position and not to pass the liquid for a large circle. Conversely, if the engine cannot type the operating temperature (and this is about 90 °C), the valve jammed in the open position.

1 – radiator 2 – cooling fan 3 – thermostat 4 – Water Pump 5 – radiator inlet 6 – radiator production 7 – Graduation Pipe 8 – graduation cover 9 – Throttle Case 10 – Heater Release 11 – heater intake 12 – Outlook 13 – intake manifold 14 – Heater Node

For checking, warming up the engine until the antifreeze temperature pointer is suitable for the red zone. Open the hood if the lower nozzle of the radiator is cold or barely warm – thermostat under replacement. If the top, and the lower nozzles of the thermostat are evenly warmed on the cold engine, it swapped in the open position and also needs to be replaced.

термостат сузуки витара
Checking the thermostat operation in water containers

The sensible thermostat is checked in a water bath heated to operating temperature. When heated, the valve should gradually open and should be opened completely to the claimed temperature. After that, as the flap is cool, the valve must be independently closed.

What thermostat is better for Suzuki Grand Vitara


There are several types of thermostats on sale. Not according to the brand producer, but on the valve response temperature. The standard thermostat on Vitara, as we have already found out, opens at 82 °C average. Nevertheless, for some conditions, such a temperature may be too low, the motor may not have time to warm up.

термостат сузуки витара
Original thermostat for Suzuki

For such cases, more “warm” thermostats are provided with a valve response temperature of 86, 88 or 90 °C. It should be noted that already at 103 °C, the first radiator fan includes, and at 106 °C – the second.

The problem of a cold engine is not only that on the cool oil it is wearing at times faster, but the stove does not warm up catastrophically long.

That is why many are preferred not original, but more “warm” thermostats. And they are quite enough. Here are just a few examples:

  • GATES TH35682G1, 82 °C;
  • CALORSTAT by Vernet TH6737.82J, 88 °C;
  • EPS 1.880.679, 82 °C;
  • Nipparts, J1538004, 82 °C;
  • MotoRad, 241-88, 88 °C;
  • Stellox 2340096SX, 86 °C;
  • Gates TH12283G2, 83 °C;
  • Wahler 410183.88D, 88 °C;
  • Suzuki, original, 1760085821;
  • Blue Print, ADK89210;
  • Fenox TS104;
  • Behr Hella TX 71 82D, 82 °C.

The most expensive thermostats – does not mean the best. For example, the Phenox is asked about of 20 USD, but no one has heard positive feedback about him. When choosing a thermostat, it is desirable to give preference not only to a proven brand. But also to look at the package – in the package there must be a seal that is subject to mandatory replacement, but it is extremely difficult to find it separately.


How to replace the thermostat Suzuki Grand Vitara


The thermostat is changing literally in 15 minutes if we have a standard set of tools at our hands, a tank for antifreeze drain and a new thermostat. If all this is, proceeding to replace. To begin with, change on a 1.6-liter M16A motor:

  1. Open the tank cover, unscrew the drain plug on the radiator and drain the antifreeze into the container.
  2. Turn off the intake hose 1 and the outlet hose 2 stoves from the thermostat case.Как заменить термостат Suzuki Grand Vitara
  3. We unscrew the cover 4 from the housing 3, carefully remove the thermostat.
  4. The new thermostat 1 is installed according to the labels 3 on the thermostat and 4 on the housing 3, combining the tags.
    Как заменить термостат Suzuki Grand Vitara

According to the same scheme, a thermostat is replaced on a 2-liter J20A engine. Details are shown in the photo below.

After installing the thermostat, the new laying of the cover and the seal fill the antifreeze in two or three receptions with the engine warming after each to avoid air intake in the cooling system.

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