Question about Volkswagen Euro
I haven't worked on the Eurovan yet, so my answer will be generic but the information should help you to quickly locate your fault. Normally I don't answer Premium Questions unless I absolutely know the full answer, but in this case you probably need a fast and useful answer instead of waiting around for an absolutely perfect one.
It's completely normal for the electric fans to run after the engine is turned off, but they should stop after a minute or two. They run on a combination of the coolant temperature sensor and a timer relay. If the fans operate correctly when the engine is running (i.e.not on all of the time, cut in and out as required) then the sensor is fine, so if the fans keep don't stop after the engine is turned off then your van has most likely has a faulty timer relay located in one of the fuseboxes. If you consult your vehicle handbook it should tell you which one it is, or the inside of the fusebox lid may also have a diagram. Note that on some models, the fan relay incorporates the timer function.
When you have located the relay(s) in question wait until the fans should have stopped and give the relay(s) a sharp tap. If the fans turn off immediately then you probably have confirmation, but repeat the test a couple more times just to be sure that the fan didn't turn off coincidentally. The fix is to replace the relay, but in the short term you can just pull either the cooling fan fuse or relay after you stop the engine. If you do this then it's vitally important that you have a foolproof way to remember to replace them before restarting the engine. Failure to do so can result in severe engine damage.
If you find that the fans do not run normally, for example they start running immediately from a cold start, then the fault is either a faulty temperature sensor or a short circuit in the sensor wiring. To test, remove the plug from the sensor: the fans should stop immediately. If not then the wiring has a fault and has probably chafed where it passes through a metal clip or through bodywork, leaving the conductor free to earth via the bodywork and sending a false signal to activate the cooling fans.
Posted on Sep 30, 2010
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Posted on Jan 02, 2017
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