rite last mini update for tonight cause im off to make fire haha (should add that the fire is in a controlled bin clearing trees haha) anyway i went out to put in the rad bleed into the housing as expected removed the plug and it was almost dry. now with gravity in mind i unbolted the header tank and lifted it as high as i could cracked open the bleed and let it bleed. when there was no more bubbles i closed it up and started the engine. no bubbles getting to the header tanks and when i crack the bleed no bubbles from the full housing. moment i put the header tank back down into place housing starts to bubble. (cap is on the header tank when i lowered it. so next i figured i would try open it up and i can have no bubbles with it up bubbles with it down but when its down i get constant flow of bubbles with it up i get nothing! did notice when i rev the coolant level dont really change at all and there's some but not a lot of movement in the header tank.
Magicgrotto
Well-Known Member
Right mi LAD ! just come back from Worksop 12mls ish but kettle on & made a drink ! then read your post !!
Just been out to truck under bonnet to see wot happens on mine ! Ran it up & not a lot of movement in header tank ! unless revved up ! put top back on & squeezed top rad hose Air coming out of cap & air going back in !! SO not under pressure SO is it your header tank Top crackerd ?????
Just been out to truck under bonnet to see wot happens on mine ! Ran it up & not a lot of movement in header tank ! unless revved up ! put top back on & squeezed top rad hose Air coming out of cap & air going back in !! SO not under pressure SO is it your header tank Top crackerd ?????
Gazbo
Well-Known Member
Pleased to hear that your "fire" was not going to be a "Disco roast", thought you may have reached the end of patience.
It's strange what you are describing with the bubbles, air must come to the top no matter what, the thermo housing is, as described, the highest point on the coolant circuit, but it has that small vent hose linking it with the top corner of the radiator and into the header reservoir, all gasses in the system should get back, especially when there are not great gouts of gas.
Maybe time to go back over the venting system and check that the small hoses are clear, but once all that is checked, gas entering the system through a crack or a blow in the gasket is the only answer to that cooling system gas ingress problem.
I have done a few major jobs on the tdi 300 engine and never had a lot of trouble bleeding the coolant system, and it sounds as if your problem is not related to the way you have filled and bled the system.
