Porschetech3

I have a coolant line to AOS by-pass kit that is for UAOS "only", but can be used as a temporary fix for AOS coolant leak ( or you can install the complete UAOS System).

Can be found here for $25 www.ultimateaos.com scroll down to bottom of page....

It eliminates both AOS coolant lines entirely and caps the system at the origin of the coolant lines...( would need to be removed before cold weather usage or the UAOS System installed)

Akashzimzimma

thanks ill check that out. In super short term emergency, ie next few days, would be there any harm in just capping off the aos coolant supply line only? Leaving return as is ?

Porschetech3

If you have a leak at the AOS, capping just the supply line will not suffice ( it will still leak due to pressure from the return line)...

Akashzimzimma

thanks, I'm still getting my head around how this works.
but if the feed line is blocked off how could the return line allow the aos to leak coolant?

Porschetech3

Answer :: " the path of least resistance"...

Coolant/liquid will flow on the path of least resistance, if you cap,block,pinch the supply line, you have just created a total resistance to flow in that direction, but the pressure/flow is still on the return line, so the coolant will flow in the opposite direction to the AOS and leak because there is no resistance to flow in that direction...

You MUST cap both lines, .....or by looping the lines around the AOS.... ie... connecting the supply line to the return line, thereby by-passing the AOS...

SARNODUDE

Many MR2 Turbo guys are running catch cans without any coolant flowing through them.
They experience zero problems. Maybe one of our aftermarket vendors should sell a bypass hose, I would buy one.

SARNODUDE

Ooops deleted post.

Akashzimzimma

I tried to bypass the AOS coolant supply by making a loop of lines 12+13 in the pdf of the AOS supply system.
i used a non return valve in the T connection to where number 12 would've plugged back in.
So basically the line going up by the pulley (13) was connected to the number 12 that would've gone down into the Tee by the tank.
however this join leaked abit due to size of the connector I had available despite the screw flange being very tight, and then seemingly another pipe , perhaps the end of number 20 going into the block, started leaking quite badly. This would be a drip with the coolant tank open or a full on leak when engine running. I'm kind of gutted as at least before I tried to disconnect the number 13 and broke the very weak connector, it wasn't leaking that bad.
i think I may have to get the car recovered to the specialist at this point. My only hope of saving that is to connect everything back the original way and remove the loop, with a repaired connection for the coolant feed up into the AOS from 13 ^ where it snapped.

Porschetech3

Are you talking about dumping blow-by gasses to atmosphere, or just eliminating coolant to the AOS?

There are several benefits to recirculating blow-by gases back through the engine for street cars..
It cools the combustion temperatures allowing for more ignition timing , it helps keep moisture out of the engine, it adds a little power and efficiency to the part throttle and cruise modes.....and it keeps the Feds from getting pissed off, they can get very ugly when pissed off..

If you are just talking about eliminating coolant to the AOS, on the 996/997, the factory flow regulator is located in a very cool place, and the moisture/water vapor in the blow-by gasses will form ice in the high velocity/low pressure area in the flow regulator and will block the port in cold weather operation... So the 996/997 factory AOS MUST have warm coolant flowing through to keep from Iceing, but with the UAOS System, the flow regulator is moved to a warm location near the throttle body and does not need the warm coolant, so it can be eliminated in the UAOS System and still used in cold weather operation...

Akashzimzimma

I tried a temp fix today by making a loop of 12+13 coolant lines _ the AOS supply and return lines. However because the small connector by the central pulley was broken, i think it began to leak on the other side of that , quite badly.
I blanked off the T with a non return valve and that was ok.
i guess I'm gonna have to wait for the replacement small connector in the middle for the aos coolant pipe, then just connect it back the original way so i can atleast drive it to the garage.
Getting fed up of this car ! Was just running ok, after a garage messed up my front wheel hub after not tightening it up after doing the front shocks.