bleed valve location for cooling system

[ucwepn]

Hi all I have questions relating to the bleed valve on the head for the cooling system, Where is the bleed valve? ie- what number cylinder on the head? is it on the passenger side? and how does it come out or open?

Thanks all I wanna refill my radiator without cracking the head.

[rattattack1313]

okay.....follow the top radiator hose to the top of the motor....see the screw with a nut on it??????fill radiator, and resevoir,then start motor...then turn it off...and check everrything is still full.....then start her again.....when it warms up a bit...you then turn the screw...and let all the air out....

[ucwepn]

Thanks bro will give it a go when she cools down (just been for a drive)

[gungazza]

the proper way to do it ,is to fill radiator ,take off rubber hose that gos from the resevoir to the rad ,and tape it to the bonnet stand above moter hight 'put in a small funnel into hose , there are 2 bleed nuts ,thay should say 'do not open when hot',open the lower nut ,and pour water into funnell, when water starts to come out of bleed hole ,tighten it ,and then lossen the top nut , and pour in more water ,and then tighten when water comes out job done
if you dont do it properly you will blow your head gasket :b:

[ucwepn]

Thanks guys

[simo]

Be careful when taking them off cause they have a tendancy to break

[Bucket]

Dont forget the one at the top of the intake manifold.

[harry3]

you must undo both bleeder nuts, safer when cold, its easiest to force water into the radiator under pressure with a hose until water flows out of both holes
if no hose the other idea with funnel sounds clever, an alternative is a long length of hose that just fits inside the radiator cap hole, to get the filling height above the higher bleeder screw on the top of the intake manifold. a spare top radiator hose seems suitable

would be a good idea to carry a spanner for the bleeder screws and other gear if you are short of water in the middle of nowhere, otherwise it seems steam builds up at high pressure in the top area, stopping any water getting up there, resulting in the infamous steam trap and a cracked head thru overheating

the nissan ebgine was shoehorned into the VL resulting in the top of the water jacket being higher than the top of the radiator

[vlrad]

Just for a laugh - about 2 weeks ago I replace the inlet manifold with a second handy - I turned the ignition on I heard the fuel lines load up under pressure. I started the car checking for leaks of any kind. After about 5 minutes I was sitting in the car (bonnet off) I was looking at the top of the engine when a 4 foot high stream of fuild streamed into the air - I thought christ a fuel leak, its going everywhere - it was coolant streaming from the bleeder (which was sitting loose).

[vlrad]

I sheard one of the bleeder bolts (the one near the temp sensor) - nasty old thing - anyone know what the treat specs are so I can run a tap in it to put a newie in.

[harry3]

would be a good idea to put some grease on the bolts

[Bucket]

just drill it out with a 3mm bit, i think the thread is only 5mm so centre punch it and drill straight, you shouldnt have to tap it. Pick up one from the wreckers, mine gave it to me. I tried others but you need to put a copper wacher there, cause it heats up you cant really use anything else.

[megee83]

the other idea with funnel sounds clever, an alternative is a long length of hose that just fits inside the radiator cap hole, to get the filling height above the higher bleeder screw on the top of the intake manifold.

mechanic mate o mine reckoned to jus cut a bottle (like a 2L milko or similar), wrap some gaffa tap round it to seal against the fill point on the radiator, top it up with some coolant and run the motor til air works itself out... ive always done it like that an havent had any probs. mind you to be honest i wasnt even aware o the bleeder screws...
is this gonna do the same job or do you think some air would still be left up in there?

[jimrichards1964]

Hi all I have questions relating to the bleed valve on the head for the cooling system, Where is the bleed valve? ie- what number cylinder on the head? is it on the passenger side? and how does it come out or open?

Thanks all I wanna refill my radiator without cracking the head.

top radiator hose nipple at head, there is a 10mm bolt/phillipshead thats number one, number two on front of intake manifold/plenum at number one pipe/tunnel it a 10mm too, but do the lower one first, then fill coke bottle stick in radiator with 10mm open till water runs out put back in bolt while bottle still filling then tighten, take out top one to remove air pockets hotspots, and squeeze full two litre coke bottle till water comes out top one, keep squeezing while you put bolt back in, this way you have done both sides of a cold thermostat,
reagards jimmy

[Jules86]

this shit is confusing...i only got the one bleeder valve the one infront of the intake manifold, the other one is snapped off (was told i didn't need it) so if i was to get a hose and have sitting higher than this valve (even higher), and pour coolant into it until it started coming out of the top (valve), would this work? And does that bolt have to be completely taken out or just loosened?
This should be able to be done while the car is off, or should the car be running while performing the methods above???

[Jules86]

Well it might seem that they didn't use my bleeder valves when the head was replaced, cuz now i have no bleeder valves. It was as tight as all hell, but i undid it slow and it went SNAP! And i went "F**K!"

[Stewart1000]

good investiment would be to build a pipe that sticks out of the top of the radiator and doesnt leak, and fill that up aswell because that makes it higher than rad and engine so it'll help get more air out!

[Bax]

I've heard of people filling it through the overflow bottle. Highest part after all.

[gungazza]

the proper way to do it ,is to fill radiator ,take off rubber hose that gos from the resevoir to the rad ,and tape it to the bonnet stand above moter hight 'put in a small funnel into hose , there are 2 bleed nuts ,thay should say 'do not open when hot',open the lower nut ,and pour water into funnell, when water starts to come out of bleed hole ,tighten it ,and then lossen the top nut , and pour in more water ,and then tighten when water comes out job done
if you dont do it properly you will blow your head gasket :b:

thats was already said

[Bax]

My bad, I misread it.

I just stick to the normal way, car on a hill so the radiator is the highest point in the car, take the bolts out, fill it until it comes out of the bottom bolt. Then do the top bolt. With the thermostat open preferably.

[mag]

Hi all I have questions relating to the bleed valve on the head for the cooling system, Where is the bleed valve? ie- what number cylinder on the head? is it on the passenger side? and how does it come out or open?

Thanks all I wanna refill my radiator without cracking the head.

Maybe a bit late but heres the location of both bleeders..

[gungazza]

good pic of bolt location

[gungazza]

the proper way to do it ,is to fill radiator ,take off rubber hose that gos from the resevoir to the rad ,and tape it to the bonnet stand above moter hight 'put in a small funnel into hose , there are 2 bleed nuts ,thay should say 'do not open when hot',open the lower nut ,and pour water into funnell, when water starts to come out of bleed hole ,tighten it ,and then lossen the top nut , and pour in more water ,and then tighten when water comes out job done
if you dont do it properly you will blow your head gasket :b:

just follow this and you will have no probs

[bangers]

you guys don't even need to use the bleed bolts. why risk snapping them. just undo the top hose into the manifold, use a coke bottle and hose and hold hold it higher than the head, pour water in and as the water comes through the manifold hose put it back on...easy.

[Bax]

And you end up with an air lock. Seriously, if you do it that way you will end up with an air pocket still. It will always be there just because of the way its positioned.