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The cooling fan control thermal switch - 2002 Volkswagen Jetta TDI

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Posted on Jan 02, 2017

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SOURCE: I have a 01' New Beetle my cooling fans come on

I finally fixed the problem. It wasn't the Water pump, or the Fan switch or the Green Temp Switch or the Fan Control Module but the "BLACK" NOT White, 2 Pin Thermal Switch 112c" It does sit in between 3 collant hoses where the upper radiator hose comes together with 2 smaller hoses. Kinda looks like a peace sign and in the center sits the 2 Pin Thermal Switch. It's not a AC Cut off switch which even the dealer tried to sell me and which I actually ordered from ECS tuning. The AC Cut out switch is "White" and even thou looks the same in size and form will not fix the issue. I was able to read the part number off the old switch which is 357919369F which when I looked it up on the ECS tuning web site did bring me to the right switch. Black with a green stripe on the top rim. I ordered that baby and it came in yesterday. Took the White switch out and put the Black switch in and guess what the fans no longer turn on when the ignition is in position 2 and now the fans come on when they are suppose to and don't sound like a jet engines afterburner. Simple 20 dollar part solved the problem. I think a lot of people are getting the wrong part from the dealer since this part is very hard to find. Everyone I asked wanted to give me that white sensor AC cut out switch but that isn't it. Here is the link to the correct switch hopefully it will help someone avoid a bit of frustration.

Posted on Apr 30, 2011


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2.6 on 190e cooling fans not running overheats in traffic

In the old days the cooling fans were operated by a thermal switch mounted in the radiator or high in the engine. Sometimes the switch was a dual stage switch to operate one or two fans at high/low speed or to operate two fans in a sequence. The switch in these cases would provide a supply to an electronic control to provide the speeds or sequence. Mostly the thermal switch either switched on the fans directly or through a relay.

Both the fan motors and the switches tend to be very reliable and in the case of a problem are fairly simple to eliminate by independently testing them and checking the supply. This becomes easier when you have discovered which system your car uses. Begin by checking the fuse. Your vehicle handbook should provide that information.

Late model cars could have the cooling fans switched on by the engine management system so apart from the fuse and motors, wiring, etc. the diagnosis could be more complex.

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On a 2001 Jaguar S type 3.0, where is the Engine cooling fan thermal switch located

There isn't a thermal switch, the cooling fan is turned on and off by the engine control module (ecm). The ecm uses the cylinder head temperature sensor as well as the a/c high pressure sensor to determine when to turn the fan on. The fan itself also has it's own control module for strategies and diagnostics. The cooling fan module is mounted on the fan itself.

Jul 24, 2015 | Jaguar S-Type Cars & Trucks

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My fiat Doblo cooling fan stays on when engine is switched off

A significant number of cars have an electric cooling fan supplied by a battery live rather than an ignition live because it is believed the cooling fan should be able to start or to continue running after the engine has been switched off.
Coolant will continue to circulate after switch-off due to thermo-syphon activity and it could reduce mechanical stress on engine components to continue cooling.

Some people modify the cooling system by fitting an additional manual switch to over-ride the thermal switch for use when standing in traffic, for whenever continuous operation is desired or to use in emergency should the thermal switch operation fail.

In the absence of such a modification that has been inadvertently switched on the fault will be due to a faulty thermal switch, a faulty or stuck relay or shorted wiring. Disconnecting the thermal switch should stop the fan and if it does it indicates the switch is faulty. The switch is mostly fitted into the radiator header tank but sometimes is fitted to the bottom tank or the thermostat housing.

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Radiator fan stays on even after engine is off and cold

A thermal switch controls cooling fan operation independently. If the cooling fan keeps running long after shutdown, that switch may have become too independent and will have to be replaced

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Overheats unless ac is running

The thermostat may be stuck. If it dosent open then the engine will overheat. If you turn the ac on then the air rushing around the engine will help cool it down. Replace the thermostat and it should fix it

Dec 30, 2012 | 2008 Pontiac Grand Prix

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Fan continues running after turning off ignition

HI. This will, generally, be the result of the cooling fan switch.

The cooling fan switch on most electric fans monitors coolant temperature signals from the engine control computer. When the engine is cool, the switch opens to keep the fan from spinning. When the engine is warm, the switch closes, thus, turning the fan on for cooling.

I would advise to Inspect the cooling fans(thermal switch),wires and connections. Cooling fan switch problems are often caused by faulty wiring or loose or corroded connections rather than the failure of the switch itself. If the wires or connections are bad, replace them. If you think the switch is defective, it should be tested.

The electric fan cooling switch, or thermal switch, can be tested by placing the element in a bucket of water. Heat the water to approximately 207°-216°F (97°-102°C) and connect the switch leads to an ohmmeter(make sure to keep the switch leads out of the water). The switch should have no continuity until the temperature reaches this level. Let the water cool off below 207°F (97°C) and the switch should lose continuity. If the switch has no continuity at any temperature, replace it.

NOTE_The thermal switch is located on the top of the radiator, usually on the passenger side.


Dec 16, 2009 | 1998 Volvo C70

1 Answer

1999 discovery is overheating, cooling fans are not coming

This is because of the improper circulation of the coolant, if the AC turned on then the engine load will be considerably increase and spoil the thermal switch (which initiate the cooling fan to run). So you better clean the radiator and check the radiator pump, then replace the thermal switch to get the things done.

Jul 23, 2009 | 1999 Land Rover Discovery

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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