Question about 1998 Volkswagen Beetle

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1998 Volkswagon Beetle - Overheating

Do you know where the thermo switch is?

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Hi,

To my knowledge, the thermal switch is normally located attached to the radiator. This senses the coolant's temperature inside the radiator and upon reaching a predetermined level switches on the radiator fan. Further, to my understanding, either the A/C or the heater must be engaged for the fan to activate.

As to your other concern, overheating; In my country, most overheating issues on Volkswagen models are resolved by:

  • entirely removing the thermostat (not applicable in cold regions);
  • wiring the fan to switch on once the engine is running (with or without the A/C or heater being turned on);
  • replacing the radiator thermal switch for the fan to a lower temp.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa

Posted on Aug 17, 2008

The Thermo switch is located on the left lower side of the radiator. It is best viewed from under the car with the left lower splash shield removed. From under the car look past the drain tube and you will see the brass nut and electrical connector. Thats it.

Posted on Aug 17, 2008

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My car starts an runs but the radiator fan is not coming on and it over heats fast. But the warning lights don't pop up on the dash board


f the engine shows signs of overheating, stop and look to see if the fan is working. With the type operated by the Connect the motor feedterminal to the live terminal onthe battery.

Check a fan motor for faults

Fan motor with the thermo-switch lead disconnected and test lead connected to the battery.Look at the battery, and take off the wiring terminals to the motor or disconnect the plug. Free the wires from clips or other fixings on the fan
A new motor is supplied without a fan, which must be refitted from the old one.The motor and fan normally come off as an assembly, but you may also have to remove the shroud and sometimes the radiator.
Separate the components. Clean the parts that are to be reused, simply by degreasing or even by repainting.
Checking the new motor When you fit a replacement motor, check it by connecting its leads directly to the battery. Be sure to connect the positive (+) and negative (-) leads to the corresponding battery terminals.Take care - the motor will kick as it starts and there will be a large spark when it is connected.
Checking the switch for faults A thermo-switch with push-on connections. The switch is threaded and has a sealing washer which must be renewed.If the fan motor is not at fault, leave the ignition switched on, take the connections off the thermo-switch and briefly touch them together.
If the fan motor now works, the switch is faulty. If it does not, check to see that there is current flowing to the switch by using a circuit tester on the feed wire to the thermoswitch.
Touch the leads together to bypass the switch.If the tester does not light, trace the lead from the thermo-switch back to its power supply; the car handbook may have a wiring diagram
A detailed drawing showing the location of electronic components and devices that are connected together in a circuit.
.If the tester lights, trace the lead from the thermo-switch through to the relay and check the terminals for tightness and cleanliness. Clean and tighten as necessary. Changing a thermo-switchThe thermo-switch is normally located in the radiator bottom tank, in the How to flush an engine radiator) until the coolant is below the level at which it is fitted. Catch the coolant in a clean container if you plan to reuse it. If a rubber cover is fitted over the back of the switch, ease it off, then disconnect the electrical connections.
The switch can now be unscrewed from its mounting point with an appropriate spanner. It may, however, be very tight, so take care not to distort the surrounding metal if it is fitted in the radiator bottom tank. Always fit a new sealing washer.
Checking the relay for faultsWith the ignition switched on, short-circuit the thermo-switch by putting a screwdriver across its two terminals; do not disconnect the leads. You may be able to hear a click from the relay as it operates. Test for current with a test lamp or circuit tester at the 'live' lead to the relay - again with the ignition switched on.
If there is current here but, when the thermo-switch is bypassed, none at the terminal for the fan-motor lead, the relay is faulty and must be replaced.
Checking the T-piece On the Datsun Cherry the thermoswitch and connections are in a T-piece on the bottom radiator hose, so look there if the switch is not on the radiator.

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1 Answer

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you changed the thermo switch and relays and it didnt fix it
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the fuse box cover should have a fuse layout diagram
engine cooling fan

look for a 30 amp fuse

they usually near the fan relays

is the air con cooling fan working with air con on
and engine running




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CHECK TO SEE IF POWER GOING TO COOLANT FAN AND COOLANT FAN THERMO SWITCH.THERMO SWITCH LOCATED BOTTOM OF RADIATOR ON THE LEFT HAND SIDE.IF POWER GOING TO THERMO SWITCH THEN SWITCH IS FAULTY.IF NO POWER GOING TO THERMO SWITCH OR COOLING FAN.CHECK LARGE FAN FUSE IN THE ENGINE COMPARTMENT AND YOU HAVE FUSE 16 IN FUSE HOLDER.IF FUSES GOOD YOU HAVE SHORT IN THE FAN WIRE OR FAULTY FAN CONTROL MODULE.SHAKE FAN WIRES IF FAN WORKS PROBLEM IN THE FAN WIRES YOU HAVE A SHORT IN THE WIRES..

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1 Answer

1998 beetle- overheating- changed thermostat- got fan run direct but still overheating


Hello, wendell2cu and thank you for asking your question on Fixya!

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your
1998 Volkswagen Beetle, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating
1998 Volkswagen Beetle

Get more great money saving tips and tricks about your vehicle from: twitter.com/acoates23234

Thanks for the vote, and good luck!

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