99 Town & Country 150,000 miles

After having multiple problems with instrument cluster, (shutting down after starting, security lights, etc,) followed procedure on this forum to re-solder circuit board where the red plug fits into the back of panel. Found a couple small cracks in solder on that circuit, so resoldering the circiut was easy and looked like it was the original problem. Originally the temp guage was reading high, but after fixing the rear plug unit, everything was fine and gauge was reading normal. Put on approx. 300 miles in 2 weeks, all of a sudden the engine temp warning lite came on, and was beeping, even though the gauge was reading normal. Bought the vehicle 2 months ago, and checked numerous things including a rebuilt BCM directly from Mopar that the original owner must have installed.

I was hoping that there is a faulty temp sensor (for the computer) that has gone bad. Any suggestions?

Second, there is an intermitttent vibration through the vehicle, coming mostly from the front. I had replaced the front rotors, pads, with the same thing in the rear, along with checking all wheel bearings. Everything works fine but every so often, there becomes a vibration that starts out small and increases, and then goes away.

All help would be greatly appreciated....thanks!