cooling fans issue Xsara hdi 90bhp dw10 year 2000 with a/c

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Clogzz
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Post by Clogzz »

The relays are OK because otherwise the fans wouldn’t run together at both speeds.
Does it flash red and stop when cold or either at low or high speed ?
Red and stop are normal at high speed.
2002 C5 2.0i AL4 230,000 km 76372389
evilclive
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Post by evilclive »

It flashes red and stop all the time.
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Clogzz
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Post by Clogzz »

Does it even flash at start-up when the engine is cold ?
If so, it's a display or indication fault, and disconnecting the battery may sort it.

After starting from cold, does the top radiator hose suddenly warm up after about five minutes ?
If it does, the thermostat is opening and coolant circulation is normal, except possibly for air locks and low coolant level.

The fans coming on slow, then fast when idling is normal for a warm engine.
2002 C5 2.0i AL4 230,000 km 76372389
evilclive
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Post by evilclive »

Yes, it does it from cold. Battery has been disconnected several times, no change.

I think mechanically it's all behaving, but don't know why the computer thinks it's wrong.
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Clogzz
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Post by Clogzz »

We have a topic going where Derek has a three-wire blue temperature sensor on a 1999 HDI 90 with air conditioning:

http://www.frenchcarforum.co.uk/forum/v ... hp?t=34743

Two wires are obviously for temperature sensing but not sure what the third wire does.
If it’s meant to earth when too hot, the sensor may be faulty and cause the ECU to flash.
We can’t go further with the three wires until someone arrives with a map. :cry:
2002 C5 2.0i AL4 230,000 km 76372389
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