These cars have electric fans instead of engine driven fan clutches. You have to take the thermostat housing out anyway to change the pump, or I did anyway, so you might as well put a new pump in. In my case the impeller on mine didnt come apart, it cracked in three places going to the middle. Which made the impeller slip on the shaft. So the impeller was only turning very slowly. Thats why it would heat up on the highway and when I would stop it would cool back down slowly. The impeller was turning enough to cool it at idle. But at highway speeds the impeller was still just turning very slowly, not cooling the engine fast enough. The engines, being aluminum, im sure it isnt good on them to overheat them very much. A waterpump is a far amount cheaper than a new head or worse. Good luck
Blaze