LCR Radiator fans inop, lets sort this once n for all

[uksteffy]

hi ok so my lcr radiator fans dont work at all even with the air-con being turned on, so im a correct in sayin its either goin to be the radiator fan control unit below battery part no. 1JO919506K

and if that dosnt sort it then il need radiator fans aswell?

iv already replaced the coolant temp sensor. and i know i can get access to vagcom to clear any faults after fitting a control unit if needs be.

yes or no (is there more to it)?????

 

[d3m0niTe]

It could be the resistors in the fan units themselves. Here is a fix http://www.seatcupra.net/forums/showthread.php?t=331943

I would suggest trying this first, new fans from a dealer are around the £400 mark

 

[Crhome]

I bet its your resistors. Just do the resistor mode b4 you start throwing money into new fans.

 

[muttly]

have you checked the fuses on top of battery.. ..ususally when the slow speed resistor fails, the fans come on at high speed every few moments if i remember rightly

 

[uksteffy]

have you checked the fuses on top of battery.. ..ususally when the slow speed resistor fails, the fans come on at high speed every few moments if i remember rightly

my fuses are all ok, and my fans do cum on high speed of a few moments or nothhing like that, is the resistors still likely to be the cause?

 

[Crhome]

If your fans come on only at fast speed, thats because you slow speed resistors are fried. My money is still on resistors.

 

[uksteffy]

If your fans come on only at fast speed, thats because you slow speed resistors are fried. My money is still on resistors.

but my fans dont come on fast or slow speed even with air-con on.

 

[muttly]

usually the fans pulse on high speed when the resistors fail with air con on.. sounds like it could be the fan control unit.. but not sure.. guess you could test the supply to the relays and you could try running a 12v supply to the fans on the high and low speeds wires to check the fans are working

this page mite help explain the the wiring

http://www.nime.co.uk/content.php?mk4fans#5.PWM Controller Design|outline