Citroen Xantia

Does anybody know which relay controls the air circulation fans in a Mk2 Citroen Xantia(2000)?

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wrote:

Sorry, post 2000 with A/c.
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the one just below the under dash plate with the fuses on (autodata)
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Duncan,
Have a search in the 'french car forum' (UK) under 'Heater Fan'
If your prob is the same as mine then the rear screen doesn't heat up either. The cause is the ignition switch and the cure is a little rewiring, all covered and even illustrated in this forum (quite a way back!)
HTH Dave
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Alas the rear window works fine, there's no 12v at the fan or the ECU though. The fuses are intact & there's 12v at both of them :-(
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Hi Duncan - back again! Have just had a look at www.frenchcarforum.co.uk
If you go there, don't go straight to citroen forum, go to search - enter keywords? - 'heater fan' - search? ' - all terms' - forum? - citroen - category? - all available
Then press the search button.
You will see many entries referring to 'blower motor' 'fan not working' 'fan fails to work' 'HDi fans' 'heater fan' etc. over two pages. Somewhere in here or it's links you MUST find the cause and solution.
Bear in mind that if you are using a meter to measure the 12v, this can read through a high resistance (bad, burnt, corroded, tarnished) connection (switch, connector, relay contact) as the meter takes little current.
It's better to fault with a 12v indicator bulb with two wires soldered on, one with a croc clip to go to earth (body) and the other with a probe of some sort. If the bulb lights fully, you can then say you have 12v, if its dim(mer) then a lower voltage and the need to look closer to the supply. The beauty of this method is that you don't have to focus on the meter scale to take a 'reading'
This is the method of faulting that *was* used in the GPO 'electro- mechanical telephone exchanges, except that the test lamp had a 50volts supply and the bulb was switchable into either the earthy lead or the 50volt lead, so you could look for 'battery' faults or earthy faults.
I once tore my hair out using a meter to find a 'no reversing lights' fault on an old Avenger - 12volts on the back of the bulb and it wouldn't light, so you think lamp unit not earthing - but it was, the fixing nuts cleaned and roughened! Turned out to be corroded terminals on the reverse light switch - found by the test lamp method!!
So, have a good read, make up a test lamp and fix that prob!
HTH Dave
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Sadly, BTDT but no T shirt & no fan. Nice bright 55W bulb, but there's no continuity between Fuse 21 & the fan :-( Also all the descriptions on French car forum are the previous model.
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