[88911coupe]

I did a search but could not find anything...not really sure what to search for anyway. Here's the issue, the last two times I drove the car after shut down I hear a sharp "TINK" sound, almost like a metallic tap on a wine bottle. It's very distinct and I've never heard it before and I only hear the "tink" 6-8 times then it stops. About 5-10 seconds between tinks. Note that it's been well over 100 here in Dallas and I noticed this after a good amount of in town driving where the temp guage creeps up to about the "8:30" position. I can manually turn on the fan and bring the temps down a bit but I don't know what this sound is or if it's something to worry about. After shutting if off tonight I was moving around the car to localize but but could not tell anything other than it seem to be coming from the engine but was bouncing off the garage floor so no telling exactly where it was. Anyone experience this?
TIA