Engine cooling fan ECU

amjake · Post by **amjake** » 21 Jul 2010, 18:26

Hi All

In pursuit of getting aircon working properly discovered the 3 relays burnt out and all testig points to ECU.

Any recommendations as to where to purchase new or recon?

I tend to steer clear of breakers from past experiences.

Cheers

Kevin

Clogzz · Post by **Clogzz** » 22 Jul 2010, 14:23

Burnt relays and sockets are caused by the high fan current, and are much more common than ECU or Bitron faults.
ECU’s come new only from Citroën and cost big bikkies if still available.
There are no recons, and if there were, many would be doubtful and intermittent.

amjake · Post by **amjake** » 23 Jul 2010, 21:38

Thanks for the reply.

In addition to my earlier post, all relays changed, fuses tested and checked, crud wiring changed.

Engine running the aircon is working but the Condensor fan and Radiator fan are not.

Testing both fans show them to be working.

So any suggestions as to why they don't run when engine and aircon running and a solution would be appreciated.

Cheers

Kevin

Clogzz · Post by **Clogzz** » 24 Jul 2010, 13:06

The top right relay must click on almost as soon as the air conditioning is switched on.
If it doesn’t, pull out and check for 12 Volts on the top pin, and on either the left or right pin of the socket, even with the key out.
If the voltages are normal there, the fault is then in the fan wiring.

rmunns · Post by **rmunns** » 24 Jul 2010, 15:05

Clogzz:

second photo isn't available on photobucket.

Clogzz · Post by **Clogzz** » 24 Jul 2010, 15:24

Oops !

And thanks rmunns, and sorted.

I had written 'realy' instead of relay in the filename, but had it right for the thumbnail, so hadn't noticed.

amjake · Post by **amjake** » 30 Jul 2010, 17:26

All sorted aircon working perfectly, more crud wiring replaced!

Cheers all for help