Out for a drive today and the car worked fine. I idled for a few minutes to talk to a neighbor and I noticed my engine temp rising. This didn't concern me, however at least once a year I let the car idle so I can verify my radiator fans are turning on and working as they should, so I got back into my driveway and got down in front of the car to listen/feel the fans working. They didn't come on and I got uncomfortable with the engine temp so I turned the AC on. The fans immediately came on so I know they have power and work.

I'm thinking my otterstat is bad or I have air in my cooling system. This summer my mechanic worked on my AC system and replaced my low pressure switch. Could this have introduced air into the cooling system?

I attempted to jumper the otterstat but I realized I don't have a jumper wire. I can't seem to buy one anywhere, is this something I have to make myself? What could I be missing or am I on the right track? Thanks.