405 TD A/C Bitron cooling fans running when engine is cold

Len H · Post by **Len H** » 20 Sep 2011, 16:03

Hello,
I've been having a bit of a war with the Bitron controlled cooling fans on my 405. I replaced the Bitron ECU and all of the relays were replaced by the previous owner with similar 306 items.

It works now but the fans run when the ignition is off and the engine stone cold, constantly cycling.

Any ideas?

spider · Post by **spider** » 23 Sep 2011, 08:38

The middle relay (usually) is the overheat one. If its missing they do what they are doing now.

Try finding a 406 one and replacing it or carefully (disconnect battery first as the fans can start at anytime!) remove it and inspect its socket for corrosion.