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That lower hose will burst. I would change it prior to any long trip.

We can do a sticky, but it would be best if it was a NEW post.

I think the flush kit can cause leaks via too much pressure or because of the chemical used. Usually the heater core (I think).

You probably can't on a 97.

The sensor is on the thermostat housing.

Can you smell it hot? Was it low on coolant? I'm thinking your sensor may have failed.