bortaf wrote:sounds more like the viscouse has seized to me, as stated the fan should spin freely untill the engine in hot, in fact with the engine idling you should be able to stop the fan with your hand (DO NOT try this just in case the fan is seized), when cold (and the viscouse not engaged) the fan is running so slow it hardly draws any air through the rad.
thats it............ thermo viscous, thermo coupler is used in gas fires n stuff, at least bortaf knew what i meant.
forgot to say , ford changed the thread on the fan..e.g. left hand/right handed at some time but i can't remember when.
a strap or chain type oil filter remover is handy to grip the waterpump pulley with if you do come to change one.