originally had a cap that leaked! This has been replaced with the sought that sucks collant back in!

Well I have bled the system again and will drive the car today to see what happends!

I have taken the overflow bottle away as it is not sucking it back up anyway! See what happends! Il keep everyone informed!

I Have done a pressure check of the cooling system and it holds pressure. Also took some plugs out and they were not covered in coolant!

Im leaning towards a blown head gasket but still not sure! Il do a compression test today!

Temp is fine! Really confusing hey!

Pressure is not increasing with temprature????Can you eloborate??

What is the cause of this?

Car has a new radiator cap!

but Im talking about 1 litre of coolant going into the overflow bottle!

Water does flow in the radiator with the cap off, hence it is not a faulty thermostat or waterpump!

How can I tell if it is the head?? There are bubbles but only when the car is at running temp! No oil in water, no water in oil!

Could it be blowing out the exhaust as I have heard this can happen???

Own a Datsun sunny, a15 with new gemini radiator, new thermostat etcc

I put new collant in it and bled the system appropriately by allowing the heaters to run to ensure I have no air pockets. It still splurts coolant out the radiator when revving the car with the cap off and running temprature! With the cap on it goes into the overflow????

What should I do, drain all the coolant and start again?? If this is not clear please ask further clarification questions! This problem has been bugging me for a while!