I have a 440 that I just put new Mopar Performance aluminum water pump, 180 high flow thermostat, recirc bottle and flushed the cooling system twice.
Car ran great for a couple of days it got no hotter than 205.
Let the car sit for a couple of day and drove it a medium distance and now the car is hitting 210 to 220.
Radiator is full and the fluid moves when the thermostat opens.
Saw on other forums about trapped air.
How do I get it out of my system?
Thanks.

 

do you have an overflow tank?

 

I have had that problem. I drilled a 1/8th hole in the thermostat it lets air escape.

 

The way i do it ,but this may not be the right way ,when the motor is a little hot ,i will losen off the heater hose at the intake ,holding the hose firmly ,until the air comes out and you see coolant.,then tighten the clamp back up.Be very careful.Like i said it may not be a good way,but its the way i do it

 

agree

 

Pressure relief rad cap, the ones with either a button or lever, you lift/push before taking the cap off to prevent hot coolant from overflowing.

Get one of those and when the engine is hot, release the pressure/air my lifting the lver, do not hake the cap off, just release the pressure.

You also may have a leak allowing air to get into the cooling system, may need to track that down to, a pin ***** hole in a hose can allow air in but small enough not to aloows coolant out!

 

Try a Mr Gasket high flow thermostat, it comes with a small hole already drilled in it. You may also want to consider raising the front of your car, removing the rad cap and then running the engine up to temperature. The thermostate will open (180F) and you'll note the coolant will start to circulate; visable as a swirlling motion. If air was trapped you'll also note sporatic bubbling or burping. Carefully replace the rad cap before shutting the engine down.