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Coolant thermostat: useful information

Thermostat is necessary in the car to regulate coolant circulation. In majority of cases it is attached to the engine block. When the engine works at temperature that reaches 75 °C, the thermostatic valve opens. Before that coolant passes only through the water pump, heating system radiator and the engine. Generally, in the liquid cooling radiator with coolant open valve is used. Thereby growth of cooling capacity can be observed. Modern cars often are equipped with several cooling liquid circulation systems.

If the indicator shows wrong figures, the cause is in the indicator or in the thermostat. Thermostat breakdown may be revealed by a big power consumption of the car for heating. In case of breakdown it is necessary to substitute the thermostat. For this purpose remove the old thermostat. Use a ring insertion to install a new one. While substitution it is necessary to pour out at least half of the coolant. After you install it fill in the coolant and make the pumping. The final stage of the testing while test drive will show how correct was the substitution.

When installing thermostat, pay attention to the filler ring, it should be new. It is present in any new set. Moreover, apply leak test to the thermostat after a test drive. An experienced car owner will be able to change the thermostat. Has the wiper broken down in your car? Or you need wiper pull rods and actuator arms? In our Internet shop you will find all spare parts for the car, for example, high-voltage cable, starter, cogged belt, transverse control arm, gearwheel, ignition module and many other original car parts.

Coolant thermostat failures

  • thermostat valves open and close irregularly;
  • depressurization of the system;
  • incomplete valves opening;
  • thermostat valves open at the wrong time;
  • thermosensitive element is worn-out or broken;
  • component operates with faults;
  • compressor is worn-out or broken.

Signs of thermostat failures

  • engine warms-up poorly or is overheated;
  • fuel consumption exceeds the norms;
  • engine power output is lower than usual;
  • “Check Engine” indicator is activated.

Causes of thermostat failures

  • strong vibration loads;
  • unstable work of engine;
  • loose fastenings;
  • level of cooling fluid is lower than it is required;
  • presence of motor oil in the Coolant thermostat;
  • cooling fan breakages;
  • high pressure level in the system;
  • strong clogging of the system.

Diagnostics

To check the thermostat proper functioning, performing of few simple actions is required. At first it is necessary to warm up the engine, then  measure the  temperature of the hose connecting the radiator to the Coolant thermostat. If the hose is cold, system works properly.

Coolant thermostat opening temperature shouldn't exceed 84–90°C. As well as the working temperature of the thermostat lower connection pipe. But we don’t recommend you to perform this operation without assistance of service station specialists.

Usually thermostat service life is 100 000 operational kilometers. However one should check  the existence of possible failures at least once a year. The thermostat operation analysis must be done when scheduled inspection of a car is carried out.

Replacement of thermostat

The damaged Coolant thermostat can't be repaired, it is to be replaced if faults were found. The operation is done by the standard tools. The installation of the part and measurement of opening temperature may only be difficult.  

Before replacement of the part it is necessary to drain a cooling fluid, to reduce a tension of clamps of heat exchanger inlet and outlet hoses. And only then the hose between the thermostat and outlet connection pipe can be disconnected. Coolant thermostat replacement is not very expensive. Therefore, it is desirable to change this part at the initial signs of breakage.

Engine Thermostat: High quality bestseller

VEMO V15-99-2023 replacement Parts Details
  • Opening Temperature [°C]: 87
  • Material: Plastic
  • Supplementary Article/Supplementary Info: with seal
  • Supplementary Article/Info 2: with thermostat, with sensor
  • Product line: EXPERT KITS +
  • Packaging width [cm]: 28,3
  • Packaging height [cm]: 11,8
  • Packaging Depth [cm]: 15,5
  • Condition: New
In stock
Details
-25%
Engine Thermostat V15-99-2023 - £ 34,68 Thermostat Housing VEMO V15-99-2023
Article №: V15-99-2023
£ 34,68
£ 46,24**
incl. 20% VAT, excl. delivery costs
GATES TH11287G1 replacement Parts Details
  • Opening Temperature [°C]: 87
  • Supplementary Article/Supplementary Info: with gaskets/seals
  • Housing Type: without housing
  • Condition: New
In stock
Details
-25%
Coolant thermostat TH11287G1 - £ 9,72 Engine thermostat GATES TH11287G1
Article №: TH11287G1
£ 9,72
£ 12,96**
incl. 20% VAT, excl. delivery costs
GATES TH01489 replacement Parts Details
  • Opening Temperature [°C]: 89
  • Housing Type: without housing
  • Condition: New
In stock
Details
-25%
Engine Thermostat TH01489 - £ 8,97 Engine thermostat GATES TH01489
Article №: TH01489
£ 8,97
£ 11,96**
incl. 20% VAT, excl. delivery costs
GATES TH46487G1 replacement Parts Details
  • Opening Temperature [°C]: 87
  • Supplementary Article/Supplementary Info: with gaskets/seals
  • Housing Type: with housing
  • Condition: New
In stock
Details
-25%
Coolant thermostat TH46487G1 - £ 30,72 Engine thermostat GATES TH46487G1
Article №: TH46487G1
£ 30,72
£ 40,96**
incl. 20% VAT, excl. delivery costs
GATES TH41683G1 replacement Parts Details
  • Opening Temperature [°C]: 83
  • Supplementary Article/Supplementary Info: with gaskets/seals
  • Housing Type: with housing
  • Condition: New
In stock
Details
-25%
Engine Thermostat TH41683G1 - £ 50,43 Engine thermostat GATES TH41683G1
Article №: TH41683G1
£ 50,43
£ 67,24**
incl. 20% VAT, excl. delivery costs
FEBI BILSTEIN 17888 replacement Parts Details
  • Opening Temperature [°C]: 87
  • Supplementary Article/Supplementary Info: without gasket / seal
  • Weight [kg]: 0,06
  • Observe service information
  • new version
  • Condition: New
In stock
Details
-25%
Coolant thermostat 17888 - £ 8,04 Engine thermostat FEBI BILSTEIN 17888
Article №: 17888
£ 8,04
£ 10,72**
incl. 20% VAT, excl. delivery costs
MEYLE 028 287 0010 replacement Parts Details
  • Supplementary Info: ORIGINAL Quality
  • Opening Temperature [°C]: 87
  • Supplementary Article/Supplementary Info: with seal
  • Condition: New
In stock
Details
-25%
Engine Thermostat 028 287 0010 - £ 8,61 Engine thermostat MEYLE 0282870010
Article №: 028 287 0010
£ 8,61
£ 11,48**
incl. 20% VAT, excl. delivery costs
MEYLE 100 121 0048 replacement Parts Details
  • Supplementary Info: ORIGINAL Quality
  • Opening Temperature [°C]: 87
  • Supplementary Article/Supplementary Info: with seal
  • Temperature range to [°C]: 102
  • Temperature range from [°C]: 87
  • Condition: New
In stock
Details
-25%
Coolant thermostat 100 121 0048 - £ 7,47 Engine thermostat MEYLE 1001210048
Article №: 100 121 0048
£ 7,47
£ 9,96**
incl. 20% VAT, excl. delivery costs
MAHLE ORIGINAL TX 15 87D replacement Parts Details
  • Opening Temperature [°C]: 87
  • Supplementary Article/Supplementary Info: with seal
  • Packaging width [cm]: 6,70
  • Packaging length [cm]: 8,7
  • Packaging height [cm]: 9,20
  • Net Weight [g]: 88,0
  • Length [in]: 2,56
  • Condition: New
In stock
Details
-25%
Engine Thermostat TX 15 87D - £ 10,47 Engine thermostat MAHLE ORIGINAL TX1587D
Article №: TX 15 87D
£ 10,47
£ 13,96**
incl. 20% VAT, excl. delivery costs
MAHLE ORIGINAL TM 13 97 replacement Parts Details
  • Opening Temperature [°C]: 97
  • Supplementary Article/Supplementary Info: with seal
  • Packaging height [cm]: 19,20
  • Net Weight [g]: 341,0
  • Width [inch]: 5,31
  • Length [in]: 7,48
  • Condition: New
In stock
Details
-25%
Coolant thermostat TM 13 97 - £ 47,43 Engine thermostat MAHLE ORIGINAL TM1397
Article №: TM 13 97
£ 47,43
£ 63,24**
incl. 20% VAT, excl. delivery costs
GATES TH36988G1 replacement Parts Details
  • Opening Temperature [°C]: 88
  • Supplementary Article/Supplementary Info: with gaskets/seals
  • Housing Type: with housing
  • Condition: New
In stock
Details
-25%
Engine Thermostat TH36988G1 - £ 35,22 Engine thermostat GATES TH36988G1
Article №: TH36988G1
£ 35,22
£ 46,96**
incl. 20% VAT, excl. delivery costs
MAHLE ORIGINAL TX 18 87D replacement Parts Details
  • Opening Temperature [°C]: 87
  • Supplementary Article/Supplementary Info: with seal
  • Packaging width [cm]: 6,70
  • Packaging length [cm]: 8,7
  • Packaging height [cm]: 9,20
  • Net Weight [g]: 116,0
  • Length [in]: 2,625
  • Condition: New
In stock
Details
-25%
Coolant thermostat TX 18 87D - £ 12,18 Engine thermostat MAHLE ORIGINAL TX1887D
Article №: TX 18 87D
£ 12,18
£ 16,24**
incl. 20% VAT, excl. delivery costs
MAHLE ORIGINAL TX 14 87D replacement Parts Details
  • Opening Temperature [°C]: 87
  • Supplementary Article/Supplementary Info: with seal
  • Packaging width [cm]: 6,70
  • Packaging length [cm]: 8,7
  • Packaging height [cm]: 9,20
  • Net Weight [g]: 70,0
  • Length [in]: 2,76
  • Condition: New
In stock
Details
-25%
Engine Thermostat TX 14 87D - £ 10,29 Engine thermostat MAHLE ORIGINAL TX1487D
Article №: TX 14 87D
£ 10,29
£ 13,72**
incl. 20% VAT, excl. delivery costs
VEMO V15-99-2002-1 replacement Parts Details
  • Product line: EXPERT KITS +
  • Opening Temperature [°C]: 87
  • Supplementary Article/Supplementary Info: with seal
  • Weight [kg]: 0,083
  • Packaging width [cm]: 4
  • Packaging height [cm]: 6,7
  • Packaging Depth [cm]: 6,8
  • Condition: New
In stock
Details
-25%
Coolant thermostat V15-99-2002-1 - £ 10,11 Engine thermostat VEMO V15-99-2002-1
Article №: V15-99-2002-1
£ 10,11
£ 13,48**
incl. 20% VAT, excl. delivery costs
HELLA 8MT 354 775-311 replacement Parts Details
  • Opening Temperature [°C]: 87
  • Diameter 1 [mm]: 54
  • Diameter 2 [mm]: 35
  • Height [mm]: 31
  • Part number of recommended accessories: 9GD 354 771-641
  • Assy./disassy. by qualified personnel required!
  • Condition: New
In stock
Details
-25%
Engine Thermostat 8MT 354 775-311 - £ 15,36 Engine thermostat HELLA 8MT354775-311
Article №: 8MT 354 775-311
£ 15,36
£ 20,48**
incl. 20% VAT, excl. delivery costs
VEMO V20-99-1278 replacement Parts Details
  • Product line: EXPERT KITS +
  • Opening Temperature [°C]: 88
  • Supplementary Article/Supplementary Info: with seal
  • Housing Type: Synthetic Material Housing
  • Supplementary Article/Info 2: with thermostat
  • Packaging width [cm]: 14,1
  • Packaging height [cm]: 12,1
  • Packaging Depth [cm]: 13,4
  • Condition: New
In stock
Details
-25%
Coolant thermostat V20-99-1278 - £ 43,86 Engine thermostat VEMO V20-99-1278
Article №: V20-99-1278
£ 43,86
£ 58,48**
incl. 20% VAT, excl. delivery costs
GATES TH40883G1 replacement Parts Details
  • Opening Temperature [°C]: 83
  • Supplementary Article/Supplementary Info: with gaskets/seals
  • Housing Type: with housing
  • Condition: New
In stock
Details
-25%
Engine Thermostat TH40883G1 - £ 38,79 Engine thermostat GATES TH40883G1
Article №: TH40883G1
£ 38,79
£ 51,72**
incl. 20% VAT, excl. delivery costs
GATES TH04182G1 replacement Parts Details
  • Opening Temperature [°C]: 82
  • Supplementary Article/Supplementary Info: with gaskets/seals
  • Housing Type: without housing
  • Condition: New
In stock
Details
-25%
Coolant thermostat TH04182G1 - £ 8,61 Engine thermostat GATES TH04182G1
Article №: TH04182G1
£ 8,61
£ 11,48**
incl. 20% VAT, excl. delivery costs
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