I changed my thermostat 2 days ago after my car was overheating. all was well after the change, but now today it just started overheating again. Seeing as it is 100 degrees + in st.louis, im not sure what the issue could be. The right side cooling fan kicks on when the motor heats up, but the drivers side does not turn on. The coolant level is fine. if anyone has any idea as to what the issue could be, please let me know.