Hi pete. There are usually bleed screws on some models near the hoses or near the thermostat and on the radiator but if you cannot see any the best thing to do is wait till the engine is cold, top up the expansion bottle to MAX mark with water then run engine till it gets hot and have heaters on hot/full but leave the expansion cap off. Cooling system should now bleed itself and you will see air bubbles in the water. Water level may rise/fall until the air has all escaped so as soon as water has stopped bubbling just top back upto MAX mark. That should cure it.
whitevanman1, December 2007
