Quote:
Originally Posted by aussiblue
The main transistor in the fan speed controller that sits in the a/c air intake duct to keep cool will have corroded and shorted. Leaves and moisture get caught in the duct sit on the transistor casing and rust it away. Replacement transistor can be had from Worldwide Electronics http://members.iinet.net.au/~worcom/ for less than $15. The symptom of the transistor's failure is a fan that stays on high speed or stays on all the time.
The transistor is Motorola 2N5686 (Ford used to own Motorola). The fan speed controller box (silver metallic held by two screws behind glove box) opens easily by bending the tabs and its not too hard to unsolder the transistor and replace it - just ensure the orientation is correct so you don't reverse wire it (very easy to do as it seems to fit better the wrong way around).
To prevent the transistor failing again I suggest you add a TO-3 plastic cover (Cat ZM-0004 at Jaycar, Cat H7290 at Altronics, Dick Smith have them but I can't find it in the catalogue) and /or an additional TO-3 heatsink (part number H3400 at Disk Smith, Cat number H0610 at Altronics, and HH8510 at Jaycar). These will keep the leaves away. You can also spray the transistor's outer case with circuit board lacquer or something similar for added protection.
See also page 6 & 7 of this thread http://www.fordforums.com.au/showth...05&page=6&pp=25
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for the life of me I cant find this dang fan speed controller.
had the glove box out and cant find no silver metallic box to unscrew.
I have an 03 BA falcon.
any help would be much appreciated