Try bleeding the system. It could have an airlock. If it is not done properly it will have an airlock in the cooling system. Open the bleed screw and let the water run out for a while and se if there is any air in the system. When you refill the water you lost, pour it in slowly.Press the hoses so that any air trapped in the system is expelled.You need to undo the header tank and hold it up as high as you can get it to get the air out.
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Great Barr, Birmingham.
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