How do i bleed coolant system on mg zr 2003
after filling cooling system there is a bleed screw on the coolant pipe that runs round the end of the cylinder head.rh has you look under bonnet 8mm head,loosen that or remove it may be blocked! the heater can give problems if you have completely drained the system or have had a major leak it may be airlocked! make sure the heater is set to hot, run engine until coolant flows from bleed screw, close bleed screw, remove coolant cap carefully,and top up.leave to stand for 20 mins or so. re top up run engine @2500 revs if the heater is cold and you have no bleed screw on the heater hose. there is a valve that fails in the heater hose bypassing the heater matrix.that may need replacing if the heater is cold, hope this helps.
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