"Is the TO3PB package older or phased down? They seem to be as rare as hen's teeth!" I don't know that - am not up to speed with what packages are available these days, but the TO220 package is ubiquitous I know for sure.

Refer to jean-philippe's statement below.

"The form factor you HAVE to specify for your new transistor: TO-3p
(if not, it will not fit properly and you will have to rework the connections, what I had to do with my TO-220 transistors.

I drove the car 2 hours today, 31C outside, humidex 38C, A/C full blast and the repair worked well. So, I would say that it is feasable to repair it yourself.

The picture is a TO-3p form factor. I think it is the size you have to specify to make the rebluid an easier task."

It looks like he used a TO220 package device without the need for insulators/bushes so you may not need to chase down the TO3P form factor device. Regarding using the Radio Shack Mosfet you have there while awaiting another one, you will fry it in short order. Maybe consider it practice while waiting for the better spec. part to turn up.

Good Luck, Phil
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'98 N/A S70 191500Klm