2012 1.4tsi rad fans run constantly when I start engine?

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I changed the coolant sensor today but it didn’t make any difference which I assumed but at least it’s ruled out . I have a spare aircon pressure sensor and will swap that in to check it doesn’t change things . My next step although I didn’t want to have to is to get the aircon regassed as it’s at zero pressure at the moment due to the rad change so at least that will cover that if it doesn’t solve it . But apart from that I’m really not sure as it’s not like it’s throwing up any other codes. I’m still not sure how long it takes for the oil temp to show as I’ve not been able to drive the car yet ,only start it and leave it to idle which gets the coolant temp up but the oil doesn’t register. Maybe it needs a run to read . Also I think I have air in the coolant system as when I Rev the engine you can hear coolant pass through the heater pipe work behind the dash when sat in the car but I have no idea how to bleed the system as just turning the heater on and removing the expansion tank cap hasn’t done it . Any ideas ?

I think you should get the VW factory eRWin service manual, to understand the a/c, oil pressure, systems with proper testing info; a vw scan too like VCDS by Ross Tech @ $199, would give you factory level live data, to do testing as well.


Unfortunately, there are no paper manuals and VW is the primary source for service info on these cars.


eRWin is $35 for 24 hours of access and you can download the manuals in .pdf format.

Check your PM’s.


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hi so just an update. I am getting the aircon pressure tested and all being well refilled tomorrow. In the meantime i found out that there was a second temp sensor on the thermostat which is identical to the one on the lower cooling rad hose . So I removed it and fitted another one I had which I knew was ok . I started the car and the fans ran a lot faster than before. I turned off the car and they still ran . So I cleared the codes . Then restarted the car and the two aircon codes didn’t show and the fans didn’t come on . I let the car warm up to temp and then waited to see if the fans came on which they did but only for a min then off again as they should . I thought great it’s fixed but later I started the car again and the fans were back to how they were before where they run semi fast but do stop when the engine is turned off ,so I checked the codes and the two air con codes were back “see pic”. So I’m hoping if I regas it might stop the fans if the codes go ? If not I’ve been told it might be my fan control module so I’ve got a new fan ready incase . If the regas or new fan don’t fix it I’m at a loss.