Question about 2008 Volkswagen Gti
Your driver side fan is BAD. It is a control module built into it and uses bus signals from the ecm to turn both fans on to variable speeds. It gets power all the time. The ONLY way for that fan to turn on with the key off is the fan itself is shorted internaly. It's covered under your warranty...unless you are out of warranty. There is no switch. No relay. No nothing. Replace that big fan and be done with it.you dont need BOTH fans,vw had a problem with this on alot of vehicles
Posted on Apr 04, 2015
Hi, it sounds like you have a faulty relay, or sendor. At worse case a shorted wire.
Posted on Apr 04, 2015
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Posted on Jan 02, 2017
SOURCE: Radiator fan not working
I am assuming that you are referring to the radiator fan. You need to verify that the fan motor is receiving 12V when it is supposed to be kicking in (engine hot) with a DVM (voltmeter) in its actual location. Having done this and likewise verifying that the ground is properly attached/connected, then your problem would be with the "clutch". Radiator fan clutch differs from aircon compressor clutch which is electrical and the transmission clutch which is mechanical. Most radiator auxiliary fans (not directly coupled) uses "silica oil". This oil has an inverse property, that is when hot it gets thicker and thus the rotation of the motor is transferred to the blades. There would be a filling hole adequately plug in or near the front of the fan assembly.
If your concern is not corrected by the addition of silica oil or if you can not measure 12V on the fan connector itself when it is supposed to kick in, then chances are your problem is electrically related. Some fan motor switching systems are coupled to the aircon switching.
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 May 29, 2008
What does the fan do when you restsrt/charge the battery? Start up again? Replace the sending unit, or unplug the sending unit first. If fan keeps running, the relay is faulty.
if it stops, the sending unit is at faulat. good luck
Posted on May 31, 2009
this van has a solid state relay unit to control the fan, when it dies it just allows the fans to run. this relay is located behind drivers headlight, attached to the bumper towards the grill. It will either be bolted on or riveted on. There will be big fins on it to keep it cool. When you change this unit you have to mount it for it to work right (zip ties are no good) seen that before.
Posted on Aug 23, 2009
Fan switch should be located in the upper radiator tank. Two wires to it. it works off the temp of the water.
Posted on Jul 12, 2010
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