Trapped air in radiator

[geosmax]

I tried to "burp" trapped air from my radiator and here's what happened. Took the rad cap of, turned the heat on and ran the car until the cooling fans came on, coolant got sucked down into the radiator.

Then i turned the heat off. Fans still running but the coolant did not go anywhere in fact it started to spill out of the radiator. The only time it went down is when I had the heat on in the car. Is this normal? Even with the heat off, shouldn't the thermostat still open and allow coolant to flow thus the level in the radiator should go down and not spill out?

[johnnyd6404]

try doing it on a hill that worked for me and when it starts to go down you need to add coolent cap it turn off the car and do it again

[MinisterofDOOM]

Exactly. Make sure the radiator opening is the highest point on the vehicle when you "bleed" the air out. If it isn't the highest point, the air can't get out.

[KineKilla]

I have also found that bouncing the car up and down while burping it seems to help get some of the trapped air out. I just put a knee on the bumper and give it a bounce while burping...