Overheating / radiator overflow

[fathergene]

Ok so my p5 with 181k s*** a thermostat over the weekend. I changed it and now it runs a normal temp but the over flow is still boiling over. K know that the thermostat is working since the temp gauge stays normal but the radiator is still boiling over after sitting with the a/c on for a while. Maybe fan relay or radiator cap? Any suggestions?

 

[Jordysoso]

My overflow tank overflows, end up
Draining coolant outta my system like crazy. Don't get why it happens either. I'd say try radiator cap first tho.

 

[Brewtal_Damage]

maybe the rad it's clogged up or something

 

[grover211]

i have same problem.. first noticed it when the radiator acutually blew up, 4inch crack in top. tried multiple things to patch it but it kept blowing it off... i was told its prolly head gasket leaking Co2 into water jacket, so i changed head gasket and now temp shows fine always but water boils out when running at stop.