cooling on an AGU

[Peter Jones]

I found some good pics of an AGU in bits over on the TEX.



Might help make sense of this.

http://images.google.com.au/imgres?imgurl=http://i6.photobucket.com/albums/y220/boilermaker1/audipics/DSC_0106.jpg&imgrefurl=http://forums.vwvortex.com/zerothread%3Fid%3D3705105%26postid%3D51863297&usg=__Oahur9khTUjFYdcY3dK8--qoZg8=&h=532&w=800&sz=232&hl=en&start=27&sig2=KCBbvtZoN9XJlN6nuELasA&um=1&tbnid=DmFOEcC4KsirAM:&tbnh=95&tbnw=143&prev=/images%3Fq%3Dagu%2Bradiator%26ndsp%3D21%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-GB:official%26sa%3DN%26start%3D21%26um%3D1&ei=Dzz8SefOIJDksgO41a3JAQ

Pete

[tommymac]

and apparently an air lift is a good way to do this too, Greg from Autohaas in thornleigh NSW (great guy btw really knows his stuff) said that placing a vacuum on the system then sticking the hose into a coolant container is also a great way to avoid air traps, but there expensive

[Peter Jones]

Test the thermostat too while it's out. Just pop it in a coffee mug and pour boiling water over it.

Pete

[Peter Jones]

There's another MK2 AGU conversion thread here which might be of use, just reading it now.

http://www.conrod.co.uk/20v1.html

Pete

[Peter Jones]

Pete, That's how the rads are in the MK2.

Gavin

Now I think about it , of course it is, there's the plastic studs on the bottom of the tamks that drop into hole in the rad support panel. I drilled new holes to mount the MK2 rad in the MK1.

Pete

[Golf Loon]

Block off the overflow hose from the radiator and just have the one from the top hose.

[Jmac]

Testing the pump is easy mate, just rev it up squeezing coolant hose and you should feel a good pulse and the hose should try and swell in your hand. Only test for these im afraid. You mention you fitted and new one with metal impellar, so be rare if that were to be shot. Yes this is the way Mk2 rad sit for sure. If that stat is stuck shut it wont circulate , havent heard anyone ask if your coolant pressure cap is ok?????
Jmac

[tommymac]

ok so 1) try blocking the top nipple,

2) no i dont know if its good jmac, why what prob would that cause?

[tommymac]

Testing the pump is easy mate, just rev it up squeezing coolant hose and you should feel a good pulse and the hose should try and swell in your hand. Only test for these im afraid. You mention you fitted and new one with metal impellar, so be rare if that were to be shot. Yes this is the way Mk2 rad sit for sure. If that stat is stuck shut it wont circulate , havent heard anyone ask if your coolant pressure cap is ok?????
Jmac

ps the old stat was fine and i had the same issue ( is tested it in boiling water and it opened) so i am still having the same issue with the new stat. Its funny you say that bout the pump I dont feel that much force when i squeeze my top hose

[Jmac]

Guys thats not an AGU piccie, looks very 2.0ltr Mk5 and look where the battery is, hope im not splitting hairs, not intentional i just clicked onto this tonight and this is what fresh eyes see
On the AGU you really should feel a decent pulse when you give it a rev up mate, thats how i test them and has proven 100% results.
On porsches we had to vac down the system and vac fill as they would never bleed, but they run front to rear and holds around 12ltrs of coolant the vac fill is REALLY good, i was going to get one made up, pirtek could make one easy, its just a manifold with a tap. I know you shouldnt need to on this car but back in the day the 5 cyl Audis were awful to bleed and had to jack up at the rear so the air would bleed to the header easier, worked well then. The way this all looks and not a good pulse i would be really suss on that water pump.
Good luck with it mate.

[tommymac]

yer, that pic isnt an AGU its off a mk5 but its cool,

Im going to pull the stat off and run the motor so see if the water pump is spinning

[tommymac]

All fixed! thanks to my mate chris!

so the trick we did was to drill a tiny 1 mm hole is the stat to stop the air banking up against it we also filled the rad from them top hose then we fed the rest through the expansion tank.

did the trick, the thermostat now opens at say 88 degrees and thank god my thermos have enough juice to bring the temp down at idle.

bloody gauge inside the car reads 110 thought that was to hot for these motors but maybe the qpeng is no calibrated right with the mk3 CTS.

[Jmac]

Funny was going to mention add a jiggle pin hole, but never as they dont normally need that, but with your set perhaps and obviously so. That was the main reason for a jiggle pin was to bleed. Glad to hear you have a result mate
Jmac