Hello there,is it possible to lubricate the ball joint/bearing race at the top of the mcphearson strut,mine on my a4 is making a lovely grinding/knocking noise,i have replaced the top two radius arm ball joint and i am reasonably sure that the noise is from higher up and not the two bottom ball joints and is the thermostat housing in the same place as the coolent drain? aaahh the joys of motoring!!