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

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Radiator fan won't come on 2003 vw beetle 2.0


replace thermo switch... this is normally located near radiator hoses.

Jan 31, 2013 | 1999 Volkswagen Beetle

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I have 1999 VW Beetle 2.0 have change all cooling fan parts all new relays sensors fans control modules and the temperature dash light keeps showing hot what could it be thats going wrong


connection to radiator fan switch could be bad.

If I take out the connector from the fan switch (thermo switch/fan control switch) that light acts just as you described.
So check the fuse box on top of the battery, take out the fuses and make sure nothing is melted. Now check if you are getting power to the switch connector. red wire is hot wire, 2 striped wires can be used as ground. Make use you get around 12 volts, not mV.

if you got no power there then try checking continuity in the wiring... you need power there to make thing work :D

learning from experiencing.

Jul 26, 2012 | 2000 Volkswagen Beetle

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

Vw jetta iv, temperature alarm sounds and flash with no aparent reason. temperature dial indiator is ok.


I WOULD CHECK BOTH RADIATOR HOSES TO MAKE SURE THEY ARE HOT. THERMOSTAT COULD BE STICKING SLIGHTLY CLOSED.CHECK COOLANT LEVEL MAKE SURE COOLANT NOT LOW.IF COOLING NOT BOILING OUT OF THE EXPANSION TANK. I WOULD HAVE CAR HOOKED UP TO A DIAGNOTIC SCANNER AND CHECK COOLANT TEMPERATURE SEE IF TEMP. OVER 230 DEGREES IF SO RADIATOR COOLING FANS NOT WORKING.COOLANT THERMO SWITCH BAD BOTH FANS SHOULD BE RUNNING AT LOW SPEED.IF ALL LOOKS GOOD YOU COULD HAVE FAULTY LOW COOLANT SENSOR IN EXPANSION TANK.MAKE SURE COOLANT IS IN THE EXPANSION TANK BECAUSE COOLANT LEVEL COULD BE LOW.ADD COOLANT IN THE EXPANSION TANK UNTIL YOU AT MAX LEVEL LINE ON THE EXPANSION TANK.DONT OVER FILL THE EXPANSION KEEP ADDING COOLANT UNTIL COOLANT LEVEL STAYS AT THE MAX LEVEL LINE ON THE EXPANSION TANK.

Jun 27, 2011 | 2003 Volkswagen Jetta TDI

1 Answer

Fan is not coming on in my 2001 VW Beetle. Checked fuses and all are ok. Where do I go from here?


Bad fans are common. You can either turn the AC on to see if that will trigger them, or jump the thermo switch at the bottom of the radiator.

There is also a fan control module located in the area under the battery, but diagnosing this is difficult.

Jan 30, 2011 | 2001 Volkswagen Beetle

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

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