Information - Coolant temperature sending unit

The coolant temperature sensor is used for converting the coolant temperature of the engine into direct current voltage. The information from the coolant temperature controller gives the possibility to fix the basic parameters of the engine control depending on its thermal situation. It also allows the sensor to correct the basic parameters of the engine control according to the nominal temperature in the engine area, behind the baffler.

The sensor looks like a Zener diode, which is energized by a constant operating current from a regulated power control device; the sensor output voltage varies depending on the ambient temperature. As the temperature rises, the sensor output voltage also increases. Temperature sensors are mounted on the engine. Installation of the sensor is accomplished by screwing it into the mounting screw holes.

The joint is sealed with sealant. The sensor is connected to the wire harness using a double contact socket with a latch. The coolant temperature sensor consists of several elements: metal sensor housing with a cap in the form of a cylinder, containing the sensing element and a plastic back with a two-pin plug.

You do not have time for car parts shopping? Repair in service centers is a lot more expensive, and replacement of parts will probably take longer than you think? Then you definitely need to go to our online store. You can do it from your home or office. All you need is to select the coolant temperature sensor that is compatible with your vehicle.

And we will deliver your order in a short time and to any convenient place. Apart from sensors, you can also buy brake pads, timing belt cover or door handles.

What you need to know about coolant temperature sensor replacement: lifetime limits, common defects and their signs, tips and recommendations

There are no defined terms for component replacement. It is replaced in case of corrosion and such mechanical damages as cracks.

Common signs of engine temperature sensor breakdown are fuel consumption increase, troubles with engine start at low air temperature. Activation of the indicator which informs about engine overheating can also signalize about sensor breakdown.

Diagnostics of the component begins with examination. If you didn’t find out mechanical damages or corrosion, then you should visit a service station for professional diagnostics. Specialists will measure resistance and voltage of the device at different temperatures and compare results with standard values.

Before performing replacement, you need to stall the engine, remove the negative battery terminal and drain coolant from the expansion tank. Then you should disconnect the power wire from the component and unscrew the broken down detail with the help of the wrench. A new coolant temperature sensor is installed into its place. Then you need to perform all the actions in the reverse order, clean stains and add coolant to the needed level.

Advices for our customers

How to examine coolant thermostat out of service station?

In order to examine the cooling system thermostat out of a service station open the bonnet and start the engine. Wait for about two minutes, and then touch the pipe, going from the thermostat to the radiator. It should be cold, as coolant at insufficiently warmed up engine moves through small circuit. If the pipe is hot, this means that the thermostat valve is not fit tightly to the mounting seat. Wait till the engine reaches operating temperature and touch the pipe again. It should be hot. The cool pipe point at jamming of the thermostat valve. For more detailed diagnostics, the component should be demounted, and for this you need to apply to specialists.

Most of all, necessity of component diagnostics is indicated by the following signs:

  • activation of the engine overheating indicator on the dashboard;
  • excessively long heating of the engine to its working temperature;
  • increasing of fuel consumption;
  • leakage of coolant near the component housing or streaks on its body.

How to replace thermostat on your own?

You can replace the coolant thermostat on your own only in case if there is no need to demount auxiliary units for gaining access to it. For installation of a frameless thermostat, usually, you need to just drain coolant from the cooling system, demount the thermostat cap, remove the defective insert and install a new one into its place. During replacement of the thermostat with a housing you need to loosen pipes clamps, disconnect them from the component body, unscrew fasteners and then demount the whole unit. Install an operative thermostat into its place, connect the hoses back and fill coolant into the system. In some cars the thermostat is mounted into the cylinder head. In this case, for its replacement you will need to remove the timing belt and auxiliary units, and after this mandatory synchronization of the crankshaft and camshaft is performed. Performing of these works should be entrusted to professionals.

What is thermostat? How is it arranged?

The thermostat is a device for adjustment of the power and direction of coolant flow. It is organized as follows: inside of the body there is a sensitive element, which is the main operating component of the part. Usually, it consists of a chamber, filled with wax and a rod, connected to the chamber. Operating principle of the thermostat lies in the following: when the engine and coolant get overheated, wax expands and drives the rod, which opens the valve for a required angle. Coolant starts moving through the big circuit, coming from the engine to the radiator, where its cooling is performed. Use of the thermostat helps to reach optimal temperature of the power unit at all its operational modes.

According to construction of the cooling system thermostats with and without housing can be used in the cars. Opening temperature of the component valve may be different in various cars, which should be taken into account during selection of the part.

Which thermostat is better to install?

It is better to install into your car the thermostats of well-known manufacturers such as Gates, Denso, Delphi, Stark Professional Line, Wahler, Ashika, Blue Print, Behr, Calorstat, Facet, Hella, Japanparts, Magneti Marelli, Mapco, Mahle, Nipparts, Triscan, Vemo. Their production is notable for efficiency and durability, and production range covers the most popular car models in Europe. In the assortment of these manufacturers you can find regular thermostats, opening degree of which is regulated by influence of coolant temperature only, as well as thermostats with electronic control, in a heating element of which a special resistor is built in. Thanks to the latter, the thermostat valve will open before the moment, when the engine reaches certain temperature, due to which the most efficient cooling of the engine is performed even in a high loads mode.

Also special and multi-purpose thermostats are presented on the aftermarket. The special ones are produced in accordance with peculiarities of the exact car model, that is why they will surely fit your car and will provide maximum operation efficiency of its cooling system. The multi-purpose ones have smaller price and may be installed into various vehicle models.

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