Xantia II noisy radiator fans

lancia58 · Post by **lancia58** » 13 Aug 2011, 06:54

The fans are OK, but the sound that they make. It is not rattle noise it is more like a loud turbine sound. Is this loud sound normal ?

Thanks
Zohar

Xaccers · Post by **Xaccers** » 13 Aug 2011, 09:51

Yes, they're flippin' powerful, and quite often when you turn the engine off you'll hear them winding down.

Estately · Post by **Estately** » 13 Aug 2011, 19:19

If a lot of cooling is being called for then my 2.0 HDI fans really growl, though having said that it would be during the heat of Spain that they will do it - otherwise the fan noise is not that noticeable.

If you leave the air con (climate control) setting that cold then when you get out of the car the sudden heat will be at best unpleasant.

Regards

NewcastleFalcon · Post by **NewcastleFalcon** » 14 Aug 2011, 08:48

Zohar

This is what mine sound like (mkI though)

xantiafanstesting

regards Neil

Post by **CitroJim** » 14 Aug 2011, 12:08

And when they're running like that due to a genuinely hot engine, just feel the wind they make under the car. It's like a little wind tunnel full of very hot air!!!

Clogzz · Post by **Clogzz** » 14 Aug 2011, 13:20

The season of the fans is back !

This looks like the low speed not working and one fan running at high speed.
With the air conditioning turned on, even with a cold engine, both fans must spin at low speed, which is very quiet.
If low speed doesn’t work, it will go to high speed when too hot, and even only one fan spinning fast is loud enough to scare the pedestrians.

lancia58 · Post by **lancia58** » 14 Aug 2011, 13:48

Hi

Neil thanks for the link to the video, yes this is the sound that is made by the fans. Does anyone know what the mechanism that controls the fans speed is? Is it just a heat sensor that is plugged onto the radiator? Anyone has the electrical diagram of the mechanism ?

Thanks
Zohar

Post by **CitroJim** » 14 Aug 2011, 13:58

lancia58 wrote:Does anyone know what the mechanism that controls the fans speed is? Is it just a heat sensor that is plugged onto the radiator? Anyone has the electrical diagram of the mechanism ?

It depends on the car. Non-aircon cars have a two-way thermoswith in the rad that controls a relayset to switch the fans on slow (by wiring them in series) at the first temperature threshold and an to wire them in parallel for top speed when the second threshold is crossed.

Aircon cars have a BITRON sensor in the thermostat housing to detect water temperature and this feeds into an ECU that controls the fan speeds.

I can supply circuits of this for Xantias...

lancia58 · Post by **lancia58** » 14 Aug 2011, 18:20

Hi Jim

My Xantia is MK-II with air condition. How this BITRON sensor looks like. It will be very helpful if you can supply the circuit diagram for Xantias.

Thanks
Zohar

Post by **CitroJim** » 14 Aug 2011, 19:34

Hi Zohar,

The BITRON sensor is the brown sensor on the thermostat housing...

If you pull the connector off of it with the ignition on the fans should run at top speed. If you switch on the air conditioning the fans should run at half speed.

Here's some typical circuits. These are for the 1.9TD diesel but all are very similar.

Schematic Diagram

Harnesses

Locations

The Bitron sensor is item 8008 and the ECU 8010.

lancia58 · Post by **lancia58** » 14 Aug 2011, 19:56

Hi Jim

Thanks a lot for the diagrams. Just to make sure that I understood correctly, when the AC is turned on both fans should run in low speed but as the engine gets warm the fans should run in high speed , right ? I didn’t understand from the locations diagram where is the ECU can you point where it is ? Can some of the AC functionalities be tested with a Lexia ?

Thanks
Zohar

Derekofpriory · Post by **Derekofpriory** » 14 Aug 2011, 20:08

Hi all, what engine are we talking about, Mk 2 Hdi's don't have a bitron sensor- all fan control is done by the three terminal temp sensor on stat housing via a multi way connector below the battery on the inner wing- this connector is a real pain, and has many connections.

Derek B.

lancia58 · Post by **lancia58** » 14 Aug 2011, 20:13

It is a 2.0 16v petrol

Zohar

Clogzz · Post by **Clogzz** » 15 Aug 2011, 08:13

Gooood !

We first have to know if both fans run with the aircon.
If they do, you’ve nearly made it; if they don’t, there’s a relay fault or so.

The fans don’t have to run at high speed when the engine is at normal operating temperature.
They’re only an emergency cooling in case of overheat.

VertVega · Post by **VertVega** » 15 Aug 2011, 08:15

lancia58 wrote:... it is more like a loud turbine sound. ...

When the fans are running in fast speed, the sound is like that.
During summer while driving in city traffic (with the air condition on), you have to stop and go several times.
I can hear them easily while waiting in the traffic lights when they switch to High_Speed_Mode

lancia58 wrote:... Just to make sure that I understood correctly, when the AC is turned on both fans should run in low speed but as the engine gets warm the fans should run in high speed , right ? ...

That is exactly how it works.

===========
Slightly Off Topic:
One more thing about radiator fan motors which I happened to learn just by coincidence

During our holiday in Greece it was "extremely hot", 38-40 deg and we drove to ancient ruins uphill.
In the parking area, with the ignition key off, doors locked, I heard and saw both fans spinning in very slow speed.
System over heating protection I guess. When we came back all was fine and quiet
This was something new which I have never seen before

French Car Forum

Xantia II noisy radiator fans

Xantia II noisy radiator fans

Re: Xantia II noisy radiator fans