 preferably replace it, not just because they sell them, but because if a cap is good today, it might be bad tomorrow if it's already 15, 20 years old. So do it. I mean, look at this. If they would have put an engine in that truck or put head gaskets in it, they still would have had this problem and said, oh, I guess we better put a cap on it. Oh, we fixed it. Give me the $4,000. Or they would have been calling saying, your work is terrible and your engine is bad. It's doing the same thing. Or they burn it up because they do run it out of coolant. So, yeah, thermostat and cap.