2007 chysler 300 3.5L burped air outta cooling system 3 times have heat new cap new thermostat oil shows no signs of head gasket leak will go 20 miles before in red zone of overheating. Back flush system? Replace fan relays ?

What is your question?

2007Chysler300 3.5L V6 RWD Replaced radiator cap/thermostat released air bleeder valve 3 times temperature gauge holding good then without warning red lines

What makes this problem better or worse?

Worse idling

How long has your 2007 Chrysler 300 had this problem?

After 20 miles