Overflow coolant bubbling in VR

[macca_223]

Hey guys. I changed the inlet intake manifold awhile ago hoping it would fix this problem, but it hasnt seem to fix it. After driving for a few weeks once the car is of the coolant overflow tank starts to bubble. I think release the air in the bleeder. I have flushed the system a numerous of times. So obviously somewhere air is getting in. I have changed most hoses heater valve and radiator cap. I am stuffed for ideas... any help would be appreciated thanks

 

[markalan1two]

have you done a compression test sounds like it could be head gasket

 

[macca_223]

nah I havent done a compression test. There is no coolant in the oil at all... I am stuffed for ideas

 

[markalan1two]

might be blowing into the water galleries and not the oil happen to me in a e46 bmw took a while to find it

 

[macca_223]

ahh... I have been reading might buy a compression meter tomorrow and see how that goes

 

[Wozza]

radiator cap? check its the right pressure type and isnt sticking in the neck of the radiator
have a look at this vid explains how to check and what to look for
https://www.youtube.com/watch?v=J07gPyEQ4SA

 

[hotrod]

like was said you have a air leak some ware , could be a simple as a new cap , but get it checked for a peace of mind, you can try the trick taping a plastic bag over the hole and see if its not a gas forming .

 

[macca_223]

The radiator cap isn't old. Changed it about 6 months ago... did change the coolant gauge sender. Now I can actually see what temperature it has the problems at

 

[macca_223]

Also not that it probably means much but the engine is either a vn or vp. As there is no cam angle sensor installed

 

[markalan1two]

when the engine is running with the radiator cap off can the see bubbles in the coolant?