If it's not blowing at all, take it out and re-solder all the connections of the PCB and clean up both side of the metal disc that's in there, I think you'll find that cures it.
I've found that only when they fail and you've got full blow are they knacked.
It's a PNP transistor in a TO3 case - I replaced mine with a heavier duty version from RS but I'm buggered if I can find the details at the moment. I cross referenced it from the part no. of an original transistor and replaced it with the highest current rating one I could find since I am running twin fans.
Agreed. Have moved it now! (People should still be able to post in this section, although not start new topics - please let me know if this is not the case).
To add to Brian's list is the part number FW26925A1.
For further information I replaced mine with this, which has a part number of MJ11015 and can take 30A. Apparently the standard transistor is also used on A/C cars with twin fans, so overkill really.
This is a definite resource which needs to be expanded so if any component parts are available for whatever is on a BX we need to try our best to list them here for future reference.
Regards Kermit
ALAN S an oracle of knowledge sadly missed by us all RIP Mate
Green Hornet well I don't really know.GS project gone to pastures new
Blue Streak 1996(P) XANTIA VSX TD (130K.)