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Greengti1

Hi all

 

i have a v6 205 project I have taken on and I am struggling with the coolant system.

 

it has the Volvo header tank in the scuttle tray and was using the standard 205 gti radiator.  Due to overheating I have decided to switch to the bigger mk3 golf radiator.

 

the main difference (apart from size) is that the 205 radiator has a pressure release cap and feed back to the header tank and the golf radiator does not.

 

this means the return feed to the header tank has nothing to connect to and the water system can release pressure when it gets to hot.

 

It would be very helpful to know how others have modified the plumbing to get over this? I have been looking using google but there is no clear answer.

 

any help would be very gratefully received.

 

thanks

 

adam

Edited by Greengti1
Did not put my name

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Hilgie

There must be more mk3 vr6 radiators then, because mine has the feed back to the header tank.

 

Also my 205 GTi radiator did not have a pressure release cap...I think only the base model rads had that!

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welshpug

the "vr6" rad isnt specific to a VR6, they're fitted to loads of things, like a 1.4 ibiza, I'll look up the Nissens catalogue later to see if there's a specific number to use.

 

some early factory gti rads had a cap but its not a pressure release type, as Hilgie said its only certain base models that had that.

 

 

I think Goliath used a 205 rad with a metal pipe and a 180 degree U bend at the bottom on his 205.

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Hilgie
4 minutes ago, welshpug said:

I think Goliath used a 205 rad with a metal pipe and a 180 degree U bend at the bottom on his 205.

Yes he did.

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Goliath
11 hours ago, Hilgie said:

Yes he did.

I did many years ago and it was crap!

I now use a vr6 rad with a take off from the top rad hose back to the top of the header tank.

 

Here's a childs drawing of the layout which I made about 10 years ago! For the VR6 rad the layout will be the same except the brown breather pipe will not go into the top of the rad but instead you'll have to fit it on to a T piece just as the top rad hose enters the rad.

23769025798_abe2caf1d2_z.jpg

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Anthony
6 hours ago, Goliath said:

Here's a childs drawing of the layout which I made about 10 years ago! For the VR6 rad the layout will be the same except the brown breather pipe will not go into the top of the rad but instead you'll have to fit it on to a T piece just as the top rad hose enters the rad.

23769025798_abe2caf1d2_z.jpg

 

I've never plumbed in a V6 conversion so I'm possibly overlooking something, but I'm pondering whether the pipe in green in your diagram above necessary?

 

As I understand it, the purpose of that pipe on the original 8v engine is to help the system self-bleed and to provide some coolant flow near the thermostat during warm up when the 'stat is closed.  On most GTi-6 conversions that pipe is deleted and blanked off on the expansion tank with no obvious ill-effect, and I can't immediately see what you would lose by also blanking it off on a V6 going from your diagram as it doesn't look to have any function.

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welshpug

I've not yet found a "VR6" radiator with a bleed takeoff, only the two 32mm plain top and bottom hose takeoffs from a MK3, mk4 use a bayonet click connection.

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Goliath
On 13/02/2018 at 9:04 AM, Anthony said:

 

I've never plumbed in a V6 conversion so I'm possibly overlooking something, but I'm pondering whether the pipe in green in your diagram above necessary?

 

As I understand it, the purpose of that pipe on the original 8v engine is to help the system self-bleed and to provide some coolant flow near the thermostat during warm up when the 'stat is closed.  On most GTi-6 conversions that pipe is deleted and blanked off on the expansion tank with no obvious ill-effect, and I can't immediately see what you would lose by also blanking it off on a V6 going from your diagram as it doesn't look to have any function.

All I know is that without the green pipe it was near impossible to bleed and always had airlocks and overheated. With the green pipe it still requires a nack to bleed it properly but it no longer overheats or has air locks.

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allanallen

Green pipe looks a good idea to me for its self bleeding effect ‘al a’ 8v. 

I always add these into gti6 thermostat housings for that exact reason, fill up the coolant and off you go, no faffing. 

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Hilgie

I don't have the "green pipe". Bleeding is no prolem as I have a bleednipple in that top hose to gete the air out.

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