I know it sounds like it's been talked a lot about those problems but I think this particular problem was not discussed (at least I couldn't find it in the forum)
Firstly, it's a 1994 (march, 1st version) 1.8i Xantia with aircon.
Problem is heater blower.
When engine off, speed to max I start the engine - sometimes fan blows on full speed, sometimes doesn't blow.
When I move the speed adjuster to anything different than max/off/auto (1,2,3 speeds) - it stops.
Then if I move it back to max or auto - it sometimes starts, sometimes not.
Whenever it "dies" like that, I "cure" it by turning off the engine than back on (with fan on max) - it starts almost always.
Tested it with aircon on and off - no difference.
Temp regulation lever works - hot on hot, cold on cold. Even the temp adjuster seems to work (climate) - after blowing on auto w/ aircon on and temp set to 22 - cuts out when temp reached (on auto) or blows hot for a while then cold again (on max) - maybe mixer motor not working?!
So here's what I did.
Dismantled the fan from under the glovebox (it's a LHD, BTW).
The fan has 5 wires going into it - 4 in a connector and 1 separate from the others.
Among those 4, there are 2 thik ones - ground and 12V (I read 12.6V at all times there, so I guess this rules out the contact switch...).
After engine start (speed on max) - fan works on max - I read ~8V on the outer thin wire - I guess it's the rightmost wire on component 8045 here http://citroeny.cz/servis/xantiaser/kli ... a80.5a.jpg) connecting to the climate ECU.
When I move the speed to 3 (2,1,off) I read 12.6V on same wire - fan stops. Move back to max - no difference - 12.6V - same as at off.
This leads me to the conclusion that the blower works, am I right?
I also dismantled the heat control unit (after removing the stereo - don't ask!) - I think it's the 8025 component on the above diagram.
Looks somewhat different in my car though - 2 variable resistors (working) - 1 controlled by the temp lever, the other preset(??) in 1 casing, connected to another casing with a resistor pack by 3 wires - all resistors measure about 1 (2? can't remember now) kOhms (exept one which reads 0 Ohms but is labeled '000') - those work too.
The whole control unit is connected to something (?) via 5 thin cables (as on the diagram). On 1 of them (an ending one I'm pretty sure) I measure differents Volts when speed controller set to different settings (2.8V, 3.2V, 3.8V, etc - numbers are by memory).
This makes me think climate controls work, right?
After studying the diagram I noticed that there is a "climate ecu" and a cabin temperature sensor (which looks pretty nasty on the diagram...) somewhere between the fan and the controls.
This cabin temp sensor I believe is located under the alarm diode on the dashboard above the stereo - the "button" w/ the holes in its cap.
What are the chances that this strange behaviour is caused by a malfuncioning cabin temp sensor?
Ah, BTW, the blower seems to have been changed in 1996 or later (it has 96 as manufacturing date - car is '94).
Also the temp sensor started making some buzzing noises just today when car powered up (contact). A hard tap on it makes it stop for a short while. When I opened things up yesterday I fiddled a bit with it trying to take it out ... unsuccessfully.
Also any tips on how to get the thing out will be appreciated. (I've ordered the Russek's manual but not here yet
)Any comments are mostly welcome!
Cheers,
kosio
BTW, where is the "climate ECU" - 8080 component on the diagram - located?