Coolant boils at shutdown, worry or not?

[GasSavers_Erik]

Thanks guys, today I flipped my fan on about 2 minutes before I parked it and did not have any boiling at shutdown.

Good points about the factory gauge not being very accurate and increased wear at high temps. I'll cut a larger hole in my grill block so it runs no more than 50% up the gauge on the highway. Actually I bought another screw in rad fan temp sensor at the junkyard and I installed it in the bottom of my radiator a few months ago, but I liked the control of having the fan switch and letting it get a little hot to keep me from using any electricity (gasoline) running the fan. I'll hook up the sensor and see if it will operate as it was designed to.

I was about to buy a stronger radiator cap, but the stock is supposed to be 13 lbs and I am afraid that jumping up to 16 lbs might be enough to make me more prone to a head gasket failure- for all I know, my head gasket might be the original (20 years old).

Thanks for all the responses.