[928uk] 87 S4 raditor fan problem

[Andy Boardman]

Evening

My fans worked fine until I replaced the radiator the other day - now cooling fan 2 runs at high speed and 1 does not run - the fan speed will intermittently drop away and the front flaps close, fan 2 tries to kick in and then everything defaults back to fan 1 (and the front flaps open) - this fan is running overspeed (very loud) now so I am worried that it will cook it.

With air con on the fan runs continuously as above - without / in traffic the fan will cut in and out but seems to do this rather too frequently - i.e. it does not cut in run for a length of time and then switch off - rather it cuts in runs then slows down / speeds up then maybe off then cuts in - almost regular cycles.

Any ideas? I have checked the feed to fan 1 and 2 and it seems to be OK when it thinks it should have two fans working. Does it seem like the finned module is kaput?

All help gratefully received as usual.

Andy
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