Bleeding Cooling System.

[Sigma]

Having some real bug bares with the car, peeps, and wondering if anybody has been here before...

I've just this afternoon fitted a spanking radiator, from Toyota, and it's still pushing the coolant out of the expansion tank?

I've bled the system by making sure the radiator top is the highest point, and then pointing the car downhill, making the pipes to the heater matrix the highest, and bleeding those there, yet it still appears to be airlocked, presurising, and spitting it's dummy out?

HELP.

 

[Jay]

Doesn't sound good mate, any other headgaskety type symptoms?

 

[Rob H]

You could try vacuum filling the cooling system that works really well it sucks out all the air and then the vacuum sucks the water in. It's worth a try! But it sounds a bit more like a head gasket problem to me that.

 

[dac69er]

agreed. ive never had trouble bleeding the system, even when i fitted a rebuild engine and new rad. i just filled the car up from the rad. started her up and kept topping her up until she wouldnt take anymore. as soon as the coolant began to overflow the rad then i put the cap on. ran it up until the rad came on. turned the car off and once cooled down topped up the rad and the expansion tank and its been spot on since.

 

[Texx]

It does sound like your headgasket is leaking and pressurising the cooling system.

Looking back, if this is your current spec then it would be a likely candidate for the failure.

JAM ECU @ 1.2BAR.
4e Block, decked by 0.40mm.
Fully Overhauled Cylinder Head with 0.05mm skimmed.
CT9A.
Toyota Headgasket, 1.2mm.

Increased compression from a decked block and skimmed head, boosting a CT9a well above it's efficiency range and using a JAM ECU to control it all is potentially enough to pop a stock headgasket.

You could try removing the thermostat and bleeding the cooling system again, if it still pushes coolant out of the radiator then the headgasket is most likely the cause.

 

[Sigma]

I did a compression test this morning...

With the tester in #4, on cranking, the radiator was like a steam train stack!

It seems anything over a bar and it doesn't like the setup.

Back to 1.0 on a new gasket

 

[pc18]

sounds like you should be running a thicker head gasket with the block been skimmed that much