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bubbling radiator

VN-88

fiery red vn manual
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hey guys. i dont no if this is normal but my car has always done. for some reason i quite often here my radiator bottle thing bubbling and making odd noises. i think its often worse wen im a little low on water.

is this normal or should i get my radiator checked. i have a new/ second hand radiator as my old one split and i only just flushed and cleaned out my water system
 

1991_Vn2nV

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I had this happen in my VL..Are you just running water in your radiator or what? You cant just use water or cheap coolant in VN's.

I ended up having my radiator replaced. As it turned out there was a blockage in your radiator. Seeing as you have a series 1 you cant check the coolant level under the radiator cap as you have no radiator cap... Take it to a radiator place perhaps and get it checked and if there a blockage they will clear it or replace the radiator.
 

VN-88

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ok well i no my radiator isnt blocked as my old one did this too, and as for clooant like all added oils and stuff like that i buy the most expensive i can aslong as its effective. i use that longlife stuff just cause its stronger. and i ran cleaner in it about 2 weeks ago, the water unfortanelty was a little brown
 

J_D

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Could be a blown head gasket. Had a vh once that always had bubbles coming from the radiator, both the tanks blew off the radiator from the extra pressure getting in the cooling system from the combustion chambers. had to change the rad as well as the head gasket and solved the problem.
 
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