Depending on the model of volkswagen you own, there may be many factors that can contribute to cooling fan problems. some common causes include: damaged radiator. broken belt or pulley system. faulty fan control module. incorrectly installed fan assembly. issues with the cooling system hoses. damaged fan blades. Normally the fan would only cycle in slow speed if a c was fine, but would run in fast mode if there was (normally) a pressure issue (low or high). easy enough to discount issue with a pressure gauge check. another known issue with a c system is,a sticky needle valve down near the radiator (l h s as you look in).
On the lower passenger side of the radiator, there is a thermo electric switch called temperature switch no. 1. when the engine coolant warms up sufficiently, this switch opens and diverts electric current through the relay coil of fan relay no. 1, which results in low speed operation of the radiator fan. alternately, a refrigerant pressure. Fan control module relay is a direct fit for the following: 1998 2010 beetle sedan & beetle convertible 2002 2006 golf 2.0 1.8 2000 2005 jetta 2.0 1.8 2001 2006 jetta wagon 2.0 1.8 genuine volkswagen part number: 1j0 919 506 k. The fan control depends on the engine. the v6 uses controller under the frame horn near the driver's side headlight. it's visible with the belly pan removed. the 1.8t has a some type of thermal plate in the same place, but the actual relay is far under the dash, above and behind the main relay plate. Battery > temp switch (in rad) > to rad fans. this setup will only give you low speed, to get high speed (i never needed the high speeds ever) just wire the high speed prongs (on the temp switch) to a relay, then go from the battery. since the high speed fan draw a lot more current than the low speed, you need heavier gauge wires and a relay.
The fan control depends on the engine. the v6 uses controller under the frame horn near the driver's side headlight. it's visible with the belly pan removed. the 1.8t has a some type of thermal plate in the same place, but the actual relay is far under the dash, above and behind the main relay plate. Battery > temp switch (in rad) > to rad fans. this setup will only give you low speed, to get high speed (i never needed the high speeds ever) just wire the high speed prongs (on the temp switch) to a relay, then go from the battery. since the high speed fan draw a lot more current than the low speed, you need heavier gauge wires and a relay. How to change the fan control module diy. i noticed that my front radiator fans were not running at all, or were running wide open speed. i ran vag com on the car and got the below code. i asked the dealer for the cost of the part and labor. part is $299 (8e0 959 501 ab)for my 02 a4 3.0q. Problems in the cooling fan relay circuit. the typical electric cooling fan circuit includes, a temperature sensor, a relay, a control module and the fan motor. the relay is the component that fails most often. so, be sure to test the relay, as well as its power supply and ground connections. a good relay coil will typically read 40 to 80 ohms.
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