This is the fix for the AC blower fan that runs on medium/high all the time even when the fan knob is turned to "0" (OFF).

So if you don't want to spend the 85$ for the new part this is the procedure to replace just the transistor which you can pick up at Radio Shack for 2.29$.
HEre's the link for the transistor;

http://www.radioshack.com/product/index.jsp?productId=206261 4&cp=2032058.2032230.2032279&allCount=27&fbn=Typ e%2FTransistor&f=PAD%2FProduct+Type%2FTransistor&fbc =1&parentPage=family

Now keep in mind this is a cheapo Radio Shack transistor and you can get better ones, I'm going to run to Fry's sometime soon and find another one just in case this one decides to die on me sometime soon. If you've replaced your cabin filter you'll sort of know what it looks like under the dash panel...

Anyway, here's the pictures and writeup...

1. Remove panel under passenger side dash (under the glovebox) by removing two phillips head screws.

2. (Not entirely necessary but nice to have more room and see what's going on) Remove glovebox door by removing two phillips head screws located underneath glovebox door (right by where the panel was held in place) and slide glove box out and lay on driver seat.


3. Unplug transistor assembly and remove two phillips head screws holding transistor assembly in place (the part circled in red) The top screw is a bit of a pain in the @$$ to get to but you can get to it.


TIP:If you have to remove the three phillips screws holding the plastic dash to the steel bar that makes it a bit difficult to remove the transistor assembly, I did this to pull on it and bend it a bit for better clearance when removing and installing the transistor assembly.

This is what it will look like once the transistor assembly is removed, notice it's directly next to the cabin filter.


When the transistor assembly is pulled out it'll be filthy and full or dust and dirt so clean it off nicely for good heat dissipation.

Here's the dash with the glovebox door pulled out...


4. Carefully remove two phillips head screws, lockwashers, and nuts holding transistor to transistor assembly. The piece is sort of adhered to the heatsink with a bunch of heat transfer grease. On the backside remove two wires attached to the transistor, if they are like mine were they're just held to the leads of the transistor with ferrels and nothing else.


Here is the actual MJ802 transistor that was installed in my unit.


5. Attach new transistor to heatsink with two phillips head screws, lock washers, and nuts. (If you have heat transfer grease rub it under the new transistor so it makes good contact between the transistor and the heatsink!)

6. Cut shrink tubing to appropriate length and put over wires, solder wires to leads of transistor (bend leads to reach nicely if necessary but be careful not to short them to the heatsink!!!!!), use a heatgun to shrink tubing.

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[Updated on: Tue, 19 February 2008 17:15]

[Updated on: Tue, 07 October 2008 06:02]