Seat heat switch off label use
 

I have a project underway that I need some help/advice on. I’m going to install a toggle switch and necessary wiring to make driver side rad fan manually operated. I have purchased oem used Porsche Boxster (2002) seat heater switch because it fits the left panel on dash blank opening . However, I wanted just a spat switch. This switch has five terminals and I cannot get a continuity reading thru any combination of terminals??all I want us on and off for fan. Any ideas??

All of the stock switches are momentary and don't work in the way that you want.

You'll need to use a latching relay in order to use any stock switch. Search here for "fan latching relay".

Amazon Latching Relay
https://www.amazon.com/ELECTRONICS-SALON-Momentary-Switch-Pulse-Signal-Control-Latching/dp/B015MRQNXS/ref=sr_1_2_sspa?keywords=latching+relay&qid=155726 1406&s=gateway&sr=8-2-spons&psc=1

I used these on a model railroad, they work great! a little big, but there is plenty of room under the dash to hide one of these.