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[Yellow Stealth]

My car was running fine until recently. the only thing that has changed recently is that the dealer changed my spark plugs as well as spark plug wires.

I had always had a little bit of coolant come out of the overflow after driving the car for a while. One night, it dumped large amounts of coolant from the overflow and it sounded like the water was boiling in the overflow tank.

I did some searches on this site and determined the seal on my radiator cap was damaged and got a new one. That seemed to fix the problem for a little while.

However, my idle now started being erratic. Instead of the normal 800rpm or so, it sits at 1500 or sometimes even 2000rpm, rarely going back down to normal levels.

After shutting my car down last night, I heard some serious boiling noises again coming from the overflow tank (but no coolant was leaking onto the ground). There was also a loud squealing noise from somewhere below the overflow tank. What do you think the squealing was from? Remember the engine was shut off at that point.

Any idea if these two problems are related? Any idea what could cause those?