rad fans

topper2 · Post by **topper2** » 08 Aug 2009, 23:00

just a quck one.
are the radiator fans supposed to both come on at the same time .
on a 2.0 hdi exclusive xantia ?

DickieG · Post by **DickieG** » 08 Aug 2009, 23:58

topper2 wrote:just a quck one.
are the radiator fans supposed to both come on at the same time .
on a 2.0 hdi exclusive xantia ?

Yes.

dieseldoggy · Post by **dieseldoggy** » 09 Aug 2009, 02:54

hi have a look around for my post other week about them.Clogzz give's you all the run down on the system init.proberly one's going wonky.take brown plug on filter housing(bitron)think same place/type plug as 1.9 td? with ign on that should put them on full speed then try to tap fan in middle with rod type thing (something not to pointed incase you miss/slip?)or take top grill off.then move it abit if not responding to tap as sometimes motor spindle/brushes get cacked and don't make contact inside.
just becarefull with pinkies???

VertVega · Post by **VertVega** » 09 Aug 2009, 10:53

I had the over heating problems caused by one of the fans. The brushes were worn out. Fan motor replacement solved the problem.
Cloggz have lots of useful information and pictures on this issue.

- Aircon Xantias have 2 fans that both runs at the same time (low and high speed)
- When the aircon is switched on then both fans are forced to run.
- At low speed they are connected in series
- At high speed they are connected in parallel (switch over relay, triangular box)

If you want to replace fan motors remember that the propeller screw is negative threaded (clockwise to open).

topper2 · Post by **topper2** » 09 Aug 2009, 19:04

thanx for replies chaps
i have only one fan working ,so... i guess i have problem

i thought maybe one fan for a/c and both for water cooling, or should i say hoped .anyway i'll test the motors and take it from there
alan

topper2 · Post by **topper2** » 10 Aug 2009, 18:34

can anyone tell me exactly where my temp sensor and bitron sensor
is pls ,and what it looks like .I've had air filter box off and the only brown thing I can find is just a three pin plug.

the symptoms are.- no fan runs untill a/c is turned on,then about 1 min later the o/s fan only, runs fullpower for about 30 secs ,engine warm or cold,makes no difference.
done visual check of relays between fans. this is a xantia 2.0 hdi 1999.
any guidence would be much appreciated

Post by **xantia_v6** » 10 Aug 2009, 21:52

If you have just one fan running, then this is not caused by the bitron sensor or even the bitrom controller. It must be a fault with a fan motor, or the fan relays, or the wiring between them.

On one of my cars, I was lucky enough that it was just a fan relay fallen out of its socket (can't have been pushed on properly by the previous repairer).

So start by pulling out the fan relays, and checking for burning of the contacts. then you might try (carefully) bridging pins on the relay sockets to apply power to each fan motor in turn.

Clogzz · Post by **Clogzz** » 11 Aug 2009, 13:37

Looks like two separate faults.
Offside at high speed when cold is a temperature sensing fault.
The brown sensor plug to the right of the blue one needs a clean.

Nearside not running at high speed is a supply fault.
Check the top left relay and socket, and fuses E & F under the bonnet.

topper2 · Post by **topper2** » 12 Aug 2009, 00:03

hi and thanks for the input guys
i tried some shorting out of relay pins today(following some earlier posts in the archives) this pointed to failed earth, or fan motor ,so went to scrappers and got motor from a pug 406. the fan blades were too big, so used existing blades . so after testing, i've got slow running both fans
when i turn on a/c. or on tickover after about 30 mins running .(I think I may need a new thermostate)
I've been unable to locate the temp sender to the bitron controler.
the BOL says, the temp sensor forms part of the A/C bitron control system ??? and of course testing should be entrusted to your local stealer
re. brown temp sender. all the pics I've seen appear to be something other than my 2.0 hdi
can anyone throw any light on this

Post by **xantia_v6** » 12 Aug 2009, 06:51

topper2 wrote: so after testing, i've got slow running both fans
when i turn on a/c. or on tickover after about 30 mins running .(I think I may need a new thermostate)

That sounds like completely normal operation to me, nothing wrong with fan or thermostat. What makes you think that you still have a problem?

topper2 · Post by **topper2** » 12 Aug 2009, 11:10

do you think its fixed then

I havent seen full speed yet, and it seems to take a long time to get to full operating temp.but I don't want to be looking for trouble if alls ok

Clogzz · Post by **Clogzz** » 12 Aug 2009, 13:12

Yes, looks like there’s nothing wrong.
High speed is for emergency cooling only, like overheating or overpressure in the air conditioning.
A long time to reach operating temperature is because the HDI is an efficient engine.
Also think that diesel engines run cooler at idle than under load.

Post by **CitroJim** » 12 Aug 2009, 14:41

Clogzz wrote: A long time to reach operating temperature is because the HDI is an efficient engine.
Also think that diesel engines run cooler at idle than under load.

Spot-on Clogzz

The HDi is particularly cool running and in the winter this can back-fire a bit and make the heating and demisting less then effective. Some HDi Xantia Exclusives were fitted with auxillary water heaters, either the Erberspacher diesel powered one or an electric one that used a special type of glowplug as heating elements.

My 2.1TD suffers the same to a lesser extent.

topper2 · Post by **topper2** » 13 Aug 2009, 01:11

well ! thanks for confirming all sounds ok. another job sorted (thats a good feeling)

you guys sure know your stuff ,and yes jim ,mine does have a diesal aux water heater. although i think it must be busted as i havent heard it kick in for years. i think its gotta be below freezing to work, but when it does it sounds like a jet engine. a bit scary first time you hear it,

till you find out what the noise is all about. lol.
thanks again for all the great info ... alan

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