Owners Skoda Octavia Tour Often faced with the peculiarities of operation of cars built on the platform A4 (B5+). Series engines 1.6 MPI and 1.8 Turbo, installed under the hood, hardy, but require flawless operation of the thermoregulation circuit. The cooling system here not only removes heat, it critically affects the resource of the cylinder-piston group and the operation of the ignition system.
Problems with overheating or leakage of antifreeze on these models arise not because of design flaws, but more often due to the aging of plastic and rubber components. If you notice a decrease in the level of fluid in the expansion tank or notice a βwedgeβ of the temperature arrow in the heat, you can not ignore this. Violation of the tightness of the system on 1.6 MPI engines can lead to the entry of antifreeze into the oil through the gasket of the HBC in a matter of minutes.
Operating a car in our climate requires the driver to pay attention to maintenance. Many of the mistakes of owners are in trying to mix different types of coolants or untimely replacement of the thermostat. The correct approach to diagnosis will save you tens of thousands of rubles on major repairs of the engine.
Contour design and main components
Cooling system Skoda Octavia Tour It is a closed circuit with forced circulation. Unlike modern models, here is used a classic scheme with two cooling circuits: small (for rapid warming) and large (for heat removal to the radiator). The central element is a water pump driven by a belt-driven timing system.
The key node regulating the flows is thermostat. 1.6 MPI engines often use wax-filled thermostats, which lose their properties over time. Incorrect operation of this valve leads to the fact that the engine either warms up for a long time or overheats even when driving on the highway.
Special attention should be paid to radiators. Nana Octavia Tour There are two main heat exchangers: the main engine cooler and the radiator of the cabin heater. Also important is the intercooler on turbo versions, which cools the compressed air before being fed into the cylinders. Pollution of the radiator cells with dirt or down significantly reduces the efficiency of heat transfer.
- π§ Water pump β requires replacement along with the belt of the HRM.
- π§ Thermostat β often jamms in a closed position.
- π§ Radiator fan - can fail due to burnout of the motor or sensor.
- π§ Expanding tank β plastic case becomes brittle over time.
Typical faults and symptoms of breakdowns
The first sign of problems with the cooling system is the unstable operation of the temperature arrow on the dashboard. If the arrow starts swimming in the 90 degree area or goes into the red zone, you must stop immediately. Nana Octavia Tour This often indicates suffocation of the system or failure of the temperature sensor.
A common problem is to leak at the joints. Plastic pipes over time βblownβ and lose elasticity, which leads to cracks. Leaks often occur in the area of the thermostat body or at the connection of the pipes with the radiator. A pump can also leak, which is accompanied by a characteristic whistle and the smell of antifreeze from under the hood.
The cooling fan may stop turning on at the right time. This occurs due to the failure of the relay, the fuse burnout or the breakdown of the electric motor itself. If the fan does not work at temperatures above 95 degrees, the engine will quickly overheat even at low speed.
- 1.6 MPI (8V/16V)
- 1.8 Turbo
- 2.0 MPI
- Other
Coolant replacement procedure
Replacing antifreeze is a mandatory procedure that must be carried out every 3-4 years or after a run of 60,000 km. On the engines. Skoda A specific type of liquid G12 or G12+ is used, which has a red-pink color. Mixing of different types (e.g., with the blue G11) is unacceptable, as it causes precipitation and clogging of channels.
The replacement process begins with the cooling of the engine. Opening the expansion tank cover, you can drain the old liquid through the drain plug on the radiator or bottom pipe.
After draining, the system must be washed with distilled water until clean water flows from the drain hole. Then a new antifreeze is poured in. To remove air traffic jams, the engine must be started and warmed up to the fan, periodically opening the tank cover with the engine running.
βοΈ Preparing to replace antifreeze
If the temperature continues to rise after the replacement, it is possible that air remains in the system. In this case, pumping will help: lift the front of the car and spin the steering wheel from side to side to help the liquid fill all the channels.
- π« Never open the expansion tank cap on a hot engine.
- π« Do not use water instead of antifreeze in winter.
- π« Do not mix antifreeze with different colors and manufacturers.
β οΈ Note: On 1.8 Turbo models, the presence of oil in antifreeze or antifreeze in oil requires immediate stop and call the tow truck. This is a sure sign of a breakdown of the gasket or a crack in the block.
Repair and replacement of thermostat and pump
Thermostat on Octavia Tour Often fails before the deadline. Its valve can jam in the closed position, which will lead to overheating, or in the open, because of which the engine will work at elevated temperatures, but will not be able to warm up to the working mark in winter. Replacement of this node is recommended for every second service.
A water pump (pump) is an expendable material. Her bearing eventually begins to luft, which causes noise and vibration. The pump's salad also wears out, leading to leakage. On engines with a timing system drive, the pump changes strictly along with the belt and rollers, since its failure can lead to a break in the belt and a meeting of the valves with the pistons.
The pump replacement process requires the removal of the timing belt and engine protection. It is important to observe the moment of tightening the pump bolts and not to skew the gasket. When installing a new pump, use only original gaskets or quality analogs to avoid repeated leaks.
What to do if the thermostat is stuck on the road?
If the thermostat is jammed in the closed position, and the service is far away, you can temporarily remove its body. This will allow the liquid to circulate only through the radiator. The engine will run cold, but you will avoid overheating and will be able to drive to the service.
When choosing spare parts, give preference to proven brands, such as: Behr, Hella or Gates. Cheap analogues often have poor quality plastic thermostat housing, which can burst when heated.
Regular replacement of the pump together with the belt of the timing is an insurance against expensive overhaul of the engine, since the break of the belt on these engines is guaranteed to lead to a meeting of valves and pistons.
Diagnostics and selection of quality spare parts
Diagnostics of the cooling system begin with a visual inspection. Check the condition of all pipes for cracks, swelling and traces of undercurrents. Examine the expansion tank - cracks on it are often not visible immediately, but when heated, the pressure increases, and the liquid begins to flow out.
Use the scanner to read the temperature sensor readings. It often happens that the arrow on the dashboard shows the norm, and the scanner captures the real temperature of 105 degrees. This may indicate a sensor malfunction or a βfloatingβ calibration.
When choosing spare parts, pay attention to the articles. For Octavia Tour There are many engine modifications and details may vary. For example, thermostats for 1.6 MPI motors with different engine codes may have different valve opening temperatures.
| Component | Original number | Analogue | Service life |
|---|---|---|---|
| Thermostat 85Β°C | 030 121 111 B | Behr Hella | 60-80 thousand km |
| Pump (pump) | 030 121 011 E | Gates, SKF | 90 thousand km |
| Fan | 1J0 959 455 | Topran, Vernet | Indefinitely |
| Expansion tank | 1J0 121 370 | Febi, SWAG | 100+ thousand km |
β οΈ Warning: If you notice air bubbles in the expansion tank when the engine is running, this is a sign of exhaust gases breaking into the cooling system. A check of the GBC gasket is required.
FAQ: Frequently asked questions
Which antifreeze is best used for the Skoda Octavia Tour?
The best choice is antifreeze standard G12+ or G12++. It is red or pink and provides excellent protection against corrosion of aluminum engine parts. Don't mix it with the blue G11.
Why does the engine warm at idle speeds, but cools on the move?
This is a classic sign of a malfunction of the radiator fan. When moving, the airflow cools the radiator, and in the parking lot without the fan, the heat is not removed poorly. Check the relay and the fan motor itself.
Can I add water to antifreeze in an emergency?
Yes, in case of critical shortage of liquid, you can add distilled water to reach the service. After that, it is necessary to completely replace the mixture with the correct concentration of antifreeze.
How often should I change the thermostat?
It is recommended to change the thermostat every second scheduled repair or every 60,000-80,000 km of run, even if it does not show signs of malfunction, as the plastic ages over time.