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Temperature switch on jetta 2 - 2001 Volkswagen Jetta TDI

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Where is the coolant temperature sensor for 2009 VW Jetta?


Hi. It should be on the gearbox side of the engine.:you will see black plastic housing and the grey temperature sensor will have a 2:pin plug

Oct 12, 2015 | 2009 Volkswagen Jetta 2.5

1 Answer

Does a 2002 jetta TDI have a themal A/C cut out switch?


No, it uses the engine temperature sensor and rad fan module.

Aug 27, 2013 | 2002 Volkswagen Jetta TDI

1 Answer

The check enging light comes on then goes off. I foud out the code po118 engine coolant temp circut high input. is it the coolant temp sensor. if so how do I replace it. It is on a 2004 jetta tdi


According to Autozone.com:

Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.
  • Disconnect the negative battery cable.
  • Unplug the ECT.
  • Then, unscrew it.
  • Reverse the removal procedures to install the new part.
  • Connect the negative battery cable to the battery.



    Related Parts:
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Coolant Temperature Sensor printpage_icon.gif



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Fig. Remove the coolant temperature sensor
The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.
A1 and A2 platforms use a different type of circuit that A3 vehicles. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited.
The engine coolant temperature gauge uses a heat sensitive sending unit to transmit an electrical signal to the gauge. The sending unit is a heat sensitive variable resistor that is located on or near to the cylinder head and threads into an engine coolant passage. The sensors are a Negative Temperature Coefficient (NTC) type. As the temperature increases, the electrical resistance of the sensor decreases. As the coolant temperature changes, so does the resistance of the sensor. The gauge is calibrated within the operating range of the sensor and interprets the resistance value to display the coolant temperature.
Beginning with model year 1994, the engine coolant gauge and the Engine Control Module (ECM) temperature sensors were combined into one sensor with 4 terminals. The basic operation remains the same in that their resistance decreases as the coolant temperature increases, however the actual resistance values of the 2 sensor circuits are different. The electrical connector of the 4-wire terminal sensor ( 1 and 2 ) is keyed to prevent improper connection of the sensor's electrical circuit.

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Fig. Beginning with model year 1994, the Engine Coolant Temperature Sensors combined the sensors for the ECM and the gauge into one sensor-1997 2.8L V6 sensor shown


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Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown

Oct 17, 2010 | 2004 Volkswagen Jetta

1 Answer

Hi I have a vw Jetta 3 1994 clx carb model coil pack keep packing up now have conversion of Jetta 2 Modulator but Rev counter is playing up oil buzzer keep sounding. Can all this be caused by the...


Your Jetta 2 modulator is not compatible with the Jetta 3 electronics, especially when it comes to the coil as they give different stokes of spark to the distributor. Oil switch must have a pressure leak. Replace the switch as a small leak of pressure can cause the sensor buzzer to sound. The modulator have no influence on the oil pressure switch.

Jul 01, 2010 | 1994 Volkswagen Jetta

1 Answer

Car getting hot


1) Is there enough coolant in the radiator?
2) Have you noticed if the electric fans are kicking on when the temp is going high? I'm guessing that they are not, the temp switch may be faulty.

Apr 30, 2010 | 2002 Volkswagen Jetta TDI

2 Answers

Why does the fan keep running on 2005 jetta after turning off


You are talking about the thermo electric cooling fan, its operation is independent of the car's electical system. It is switched on and off by the engine temperature. When you park, the engine heat soaks upward to heat the thermostat turning the fan on. It will run until the engine cools down and the thermostat switches it off. Quite normal operation.

Apr 19, 2010 | 2007 Volkswagen Jetta 2.5 Sedan

3 Answers

Cooling fans will not come on


Hi,

Fan Relay switch is stuck open. This of course assumes your temperature sensor is working appropriately. Which I assumed since you seem to know that the engine is running hot.

Replace the fan relay switch. The relay switch is tripped when the temperature sensor tells the computer the engine is too hot.

Until you get the relay switch replaced, you can either by-pass the relay switch and directly connect the fans to the battery, or turn on your A/C ALL the time and use it at a minimum setting. This will keep the cooling fans running at all times.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Jul 26, 2009 | Volkswagen Jetta Cars & Trucks

1 Answer

01 VW jetta coolant fan does not cut on


disconnect the cooling fan temperature sensor on the engione that turns on the fan, if the fans runs the switch/sensor is defective.

Mar 28, 2009 | 2001 Volkswagen Jetta TDI

1 Answer

2005 vw jetta radiator cooling fan wont shut off


Check for a switch at lower part of rad. Should see a wire harness & plug on a sensor at bottom of rad. This sensor/switch also operates fan on/off according to coolant temperature. You may need to disconnect battery to get at it safely.

Jan 16, 2009 | 2005 Volkswagen Jetta

1 Answer

Fan cooling system of an engine v.w


A thermal switch controls the radiator fan and if the temperature of your radiator is above a preset temperature value, the thermal switch will close and the fan will turn on and will stay on even after you turn the motor off, until your radiator temperature cools down. I wouldn't worry about.

Jun 11, 2008 | 1996 Volkswagen Jetta

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