http://www.club-xm.co.uk/forum/viewtopi ... 80#p116047
to deal with both repairing them, and wading through the large number of counterfeit/dud/wrongly built modules on the market. As Marc says, many (usually Chinese) copies have a short life, or do not work on arrival.
Jim, Mike, Marc, Peter and others have written several times here about the same issue.
The module has a Citroen/Peugeot part number of 6441.78, and is still available (at £165.66 incl VAT), having been fitted to a large number of cars - including AX, Berlingo, Saxo, Xantia, XM, Xsara, ZX, and equivalent Peugeot stablemates.
The module has remained unchanged over many years, but the two large power transistors have varied over time. In recent years, those that work have included ones marked 2N6287G, ST26025A and MJ11015.
Any fitted with MJ11016 are the wrong type of Darlington transistor, and unsuitable for use. Some Chinese copies had these fitted, with an altered circuit board.
The Club-XM thread goes into a good bit of background detail, but we found the genuine Valeo module (Valeo part no.698032) is available from here, and at €45.58...
https://www.amazon.de/dp/B0068M8GEG/ref ... =8-1-fkmr0
Having just laid one in as a spare, I got its authenticity checked with Valeo UK, and it is exactly what they have on their own shelves.
Hopefully, this will help identifying pukka modules, which are available from a good many sources.
Note
Under load conditions, even at low fan speeds, it is essential that the unit is fan cooled, otherwise it will overheat. Therefore, if one of these units appears to fail on the car, it is essential that the blower motor is confirmed as working properly.
This can be done by unplugging it from the module, and applying 12v (to the two thick cables, via a suitable fuse) direct to the fan. Expect it to take up to 15amp running at full speed, maybe up to 20amp. If the fan arcs, is stiff, reluctant to start, noisy or runs erratically, it should be stripped/repaired/replaced.
A damaged fan can ruin its control module, so important if fitting a new one.
