When it rains it pours. After my stuck on the side of the road hassle with the shutoff solenoid I was all set to take the '98 to Syracuse last Wednesday. Got about 20 miles from home, took a freeway offramp and got a huge cloud of steam from under the hood. Turns out the upper radiator hose had spat out the coolant temp sensor when the metal clip holding it broke.
Fortunately there was a little garage nearby and the guy made me a temporary replacement clip out of wire. Unfortunately I'd lost the seal for the sensor so I couldn't get it sealed in. I tied another piece of wire around the sensor to hold it in tight and wrapped a towel around the whole thing which got me back home with only 2 gallons of water leaked out but it wasn't any fun.
IDParts provided a new sensor, clip and seal for cheap enough that I didn't think it was worth figuring out what I needed for a seal. On Friday I stopped at Harbor Freight and bought a selection of o-rings. I'll keep a couple in the car from now on. The clip in question was metal, the replacement is plastic so it won't rust but it might fatigue and break none the less. I went to a junkyard and found another metal clip. I'll keep an eye on the plastic clip and replace if I think its warranted.
The replacement part in place: