Question about 2003 Volkswagen New Beetle Convertible

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Coolant temeperature sensors/switches

How many coolant temperature sensors or switches are there in a 2003 vw new beetle? what else controls the radiator fans besides the thermo switch mounted on the radiator itself

03, beetle 1.8L turbo,20V,Manual transaxeal,w/ A/C

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  • aln2600 Nov 30, 2008

    i have golf volks. 2002 1.6 automatic, coolant temp. sensors/swithches problem, fan radiator keeps on running when engine turns off

  • k4mattock Dec 10, 2008

    Temperature gauage goes up and down, I assume it is the temperature sending unit. I need to know where it is located under the hood so I can change it myself.



    Second Question: the light in the heater control is out -- I need to change it and want to know how to go about getting at it.

  • Anonymous Mar 14, 2014

    trying to disconnect thermo switch

  • Anonymous Mar 24, 2014

    radiator fan burnt and I replace it, then the coolant light is on and the temperature always reads hot.

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  • 67 Answers

There is a modual under the res with a blade fues in it. the modual and coonection rot due to coolant spills.great place to put them volkswagen

Posted on Nov 30, 2008

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1 Answer

2000 vw beetle fans always running have to disconnect the battery?


The temperature sensor/switch on the radiator is defective and stuck in the closed position. Buy a new temperature sensor/switch and install it on the radiator. Ask the auto store for permatex gasket sealant to put on the threads to prevent coolant from leaking out where the new part gets installed.

May 30, 2014 | Cars & Trucks

1 Answer

Code 1 senser P0118 on a 2004 V.W beetle dicesel


P0118 for Volkswagen - (ECT) Engine Colant Temperature Circuit High

Symptoms:- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes:
(Inspect the following... Repair/Replace if necessary)
- Low engine coolant level
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty engine coolant thermostat

P0118 VOLKSWAGEN Description: The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the (ECM) as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
When is the code detected?:When an excessively high voltage from the sensor is sent to ECM.

I hope this helps! Let me know if you need further assistance.

Mar 08, 2012 | Mercedes-Benz C Cars & Trucks

1 Answer

The blue temp icon comes on as usual on start up thn as engine warms it goes off as you would expect but on long journeys it comes back on thn goes on and off. What could be the problem.


Faulty thermostat is most common problem. Blue lamp on indicates coolant not reached operating temperature.

Blue Lamp hould stay out when coolant reaches operating temperature. VW have updated the Coolant Temperature Sensor. Thermostat is opening too long allowing coolant to cool below operating temperature tripping Blue Lamp..

New sensor should be GREEN in color and lives on the coolant hose running back across the rear of the engine.

When getting one replaced make sure you get the 'O' ring and new plastic clip to hold it in, along with the Sensor. They are orderable separately and your VW parts guy will not offer 'O' ring and clip unless you ask.

Check coolant is circulating into the bottle on the inner fender .
These engines also suffer from failure of the coolant pump when the plastic impeller breaks up or comes off the drive shaft. this causes overheating.

Jan 02, 2011 | 2002 Volkswagen Beetle Turbo S

1 Answer

On my 1998 vw beetle the cooling fans are not running, I have changed the coolant temperature switch, the fan module switch, and the sensor on the radiator. Would the thermostat keep them from coming on?


The cooling fans work with a sensor. It has to reach a certain temperature in order for it to work. Maybe it is not the fan. Fan not coming is definitely caused by a faulty thermostat.

Dec 09, 2010 | 2000 Volkswagen Beetle

1 Answer

My 2003 vw bug dies and won"t start when i run the ac on very hot days. sometimes when i"m driving all the instrument panel lights all come on ant then it loses power to aprox 5 mph. I checked the...


ENGINE GETTING TOO HOT AC PUTS MORE LOAD ON ENGINE AND OUT SIDE TEMPERATURE HOT.YOUR CAR TELLING YOU I AM HOT AND NEED A BREAK.MAKE SURE COOLANT LEVEL NOT LOW AND THE COOLING FANS RUNNING WHEN AC GOING IF NOT CHECK FAN FUSE IF FUSE GOOD.YOUR THERMO SWITCH NOT WORKING OR THE COOLANT TEMPERATURE SENSOR AND FAN CONTROL MODULE COULD BE THE PROBLEM IF THE FANS DONT TURN ON.

Jul 15, 2010 | 2001 Volkswagen Beetle

1 Answer

Error code po0117. Vw beetle


16501/P0117 - Engine Coolant Temperature Sensor (G62): Signal too Low Possible Symptoms
  • Difficulties with starting a cold engine.
  • Starting the engine when engine is warmish or warm, idle rpm immediately is 1200 - 3000 rpm.
  • RPM at idle is irregular.
  • With all engine temperatures seldom idle rpm will vary between 900 - 1000 rpm.
  • With engine warm (90 °C) the engine temperature suddenly drops (70 °C) and slowly comes back to 90 °C.
  • Bad acceleration during warming up.
    • Diesel: an indication is extreme long time burning time of the glow indication light.
Possible Causes
  • The electrical signal coming from G62 is too low
  • Wiring and/or connections faulty (short circuit?)
  • Engine Coolant Temperature Sensor (G62) faulty
Possible Solutions
  • Check wiring and connections
  • Check / Replace Engine Coolant Temperature Sensor (G62)
Special Notes
  • In MY 1995-2002 (?) in Europe at VW-cars the G2/G62 had the bad reputation of breaking down often. The default G2/G62 is black and all replacements are green.

Mar 21, 2010 | 1999 Volkswagen Beetle

2 Answers

Vehicle says its overheating but isn't


sounds like you need tyo replace the thermostat

Jul 23, 2009 | 2000 Volkswagen Beetle

2 Answers

Engine warning light on all the time been to


check the plastic connectors in the cooling system.vw is notorious for the plastic stuff cracking causing a slow leak

Jul 19, 2009 | 2000 Volkswagen Beetle

1 Answer

My check engine light came on in my 2002 New VW Beetle, stick shift not a turbo. Ran code and says p0117 temp circuit, I may need new Coolant temperature sensor. My a/c died two weeks ago. Could this be...


If it's a 2.0L, then the coolant sensor would be an easy fix. It's between the Air box / engine (on top of the coolant flange on the end of the head). If you do that, you probably should do a thermostat. Usually it's recommended to replace the thermostat when you do a coolant temp sensor, but that's up to you.

Jul 11, 2009 | 2000 Volkswagen Beetle

2 Answers

1999 VW New Beetle Coolant Temp Sensor


at the back of the cylinder head gearbox end it sits in the water pipe

Dec 20, 2008 | 1999 Volkswagen New Jetta

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