2007 Chrysler 300 running hot.

What is your question?

No Leak, forgot to start engine when replacing coolant after draining. Every so often coolant starts coming out from under the cap. Pump or thermostat? Mixed coolant. Mixed coolant with water.

What makes this problem better or worse?

Excessive driving

How long has your 2007 Chrysler 300 had this problem?

Off and on for 3 weeks