Hi,
On my peugeot 406 (1998 with aircon) I had a heater blower motor that went faulty and stayed on full power all the time.
The motor was in the left hand footwell behind a carpet screen (screen held in place by plastic rivets which pop out). The motor is held in place by three screws. I removed it and stripped it down to find a large, aluminium heatsink with two large transistors (marked FW26025A1) fixed to it and an associated circuit board.
One of the transistors was faulty so I replaced both with an equivalent (MJ11015 - total cost £11.42 inc P&P from www.rswww.com). This fixed the problem.
You need to drill out 4 rivets holding the transistors and desolder them so it's not a DIY repair unless you are OK soldering circuit boards. However a TV or HI FI repair shop should be able to do the repair for a modest fee if you supply the transistors.
Another common fault with these blowers is they stop working completely. Usually this is not the blower but the rectangular connector block which plugs into the blower and powers it. Often with this fault you can kick the passenger footwell and the motor jumps into life for a short time!
You need a small pair of long nose pliers to squeeze tighter the individual female spade connectors within the connector block. Once they are a snug fit on the blower all should work once again.
Hope this helps
Peter
Peter
August 2008