One problem related to water pump has been reported for the 2007 Chrysler 300C. The most recently reported issues are listed below.
We were on the freeway and in the space of several seconds, we lost rpms, the check engine light came on, then the traction light, then all of the lights, then it died just as we got onto the shoulder. The mechanic had to replace timing belt and water pump just to get it running enough to run the codes. Mechanic reports that there are bent valves and 4 of the cylinders are misfiring.