water bubbling out

[chimi500]

water is bubbling out of my expension tank when the car is idling, when under rev's the water returns back to halfway down the tank again.
i haven put any water in the car since it was serviced so i'm sure its not overfilled, any ideas?

[chris watton]

I had that same prob in my Chim 450 last year, after a service, the garage put in a tad too much coolant, so when I accelerated, water/coolant would 'jet' out from the bonnet onto my windscreen!!
Took it back to the garage that serviced it and they emptied some of the coolant,, and all was fine again,,, I also bought a new expansion tank top too,, just to be on the safe side

Chris

[chimi500]

let the car go cold for the last few hours and half filled the expansion tank again , left it running and the same thing happend again , water bubbling out of the top of the tank, it's like the engine is trying to push all the coolant out.
Hope this doesnt signal more head trouble

[GreenV8S]

An air lock in the engine would cause this. As the revs increase, the pump generates more pressure. This causes any airpockets in the engine to shrink so the water level goes down slightly. As the revs drop the pressure reduces and the air bubble expands again, raising the water level.

[chimi500]

GreenV8S said:

An air lock in the engine would cause this. As the revs increase, the pump generates more pressure. This causes any airpockets in the engine to shrink so the water level goes down slightly. As the revs drop the pressure reduces and the air bubble expands again, raising the water level.

thanx for the reply, is removing the air pockets somthing an amature can do , or should i take it to the local dealer?

[the dodger]

Re-fill system as per the bible, not forgetting the bleed screw on top of the rad r.h. tank. Leave cap off, let the engine run until the stat opens and check coolant circulating then put cap on. Run up to temp then let it cool off (for a few hours/overnight) check levels again.

[Kenny chim 4]

the dodger said:

Re-fill system as per the bible, not forgetting the bleed screw on top of the rad r.h. tank. Leave cap off, let the engine run until the stat opens and check coolant circulating then put cap on. Run up to temp then let it cool off (for a few hours/overnight) check levels again.

...and, ensure you turn the dashboard heater dial to 'hot' prior to bleeding

edited to add- might be worth buying a new cap as Chris suggested (VW part) as, once they've blown, there gone.

>> Edited by Kenny chim 4 on Monday 26th April 22:38

[chimi500]

Tried to remove the airlock as in the bible, but it still seams to be doing the same thing, is lots of water supposed to come out when i remove the radiator bleed screw? I waited till the water stoped coming out of the bleed screw then replaced it and re-filled the swirlpot and replaced the brass screw, have i done this right?

thanx

[the dodger]

Kenny chim 4 said:

the dodger said: Re-fill ....again. ...and, ensure you turn the dashboard heater dial to 'hot' prior to bleeding edited to add- might be worth buying a new cap as Chris suggested (VW part) as, once they've blown, there gone.

Thanks again Kenny (I always forget the heater tap!)

[harrow_chim]

The idea of the bleed point on the radiator is to let trapped air out of the radiator - just like your central heating. As soon as water starts to come out stop bleeding.