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[Jimbob]

When Big Blue is warm, and the aircon is on...

The Aux fan cycles on and off, at high speed every couple of seconds,  very annoying.

Ive run through some tests on the fan test connector, and I can get the main engine fan running at different speeds.
The drivers side aux fan running at different speeds, but the passenger side aux fan doesnt come on at all (I may need to bridge one of the stats to make this happen?

The orange relay clicks on and off with this, and Ive swapped it out (although it isnt a known good one), and the problem stays the same.

Any ideas what to try next?

[Kevin Wood]

Is the passenger side fan free to turn? They are wired in series at low speed (all the time if air con is operating), so if one of the motors is stalled due to seized bearings, the other run just runs faster.

[steve6367]

I had this on one of mine and it turned out to be a blow fuse in the engine ECU compartment stopping the series operation.

[Jimbob]

Cheers. Between you you've nailed it.

Fan took a fair nudge before it would move

30a fuse was intact. But one terminal was enlarged. Swapped it out and both now low and apparently working ok. Full test tomorrow

[Jimbob]

The fuse