Although I appreciate your budget is tight I would get the head gasket sorted QUICK..
Air locks can cause failures of coolant hoses and even radiators.
I hate to say this to a new user on a renault forum by have you considered changing the car for a 1990 automatic 2.4l Toyota Previa - These are generally very well put together + looked after vehicles - the autobox ensures the engine is not overstressed and as a direct result they are far more reliable...
You should pick up a good condition one for around £800 to £1000..
Last edited by Laguna II Owner; 18th October 2006 at 12:48 AM.