Used 2.0 TSI engine parts WANTED

My 2012 Tiguan has just hit 110,000 klms and I've had to top up the coolant several times recently. On inspection the pink tell tale signs were around the auxiliary pump but the fluid is coming from higher up....the water pump. After reading several forums I should count myself lucky to get this far. I ahve ordered a cast aluminium pump from a site on Aliexpress. Delivered it will be US$149.55. I will fit it myself and take the opportunity to clean the inlets as it will mean having to remove the inlet manifold, a tedious job but not to hard I expect. At least its in the front, not like my old golf gt where it was at the back. I note that it is the water pump housing (in plastic) that fails, so in the future I will only need the actual water pump which is available separately. Fingers crossed the tiguan lasts the month or so till the part arrives. Should I remove the radiator cap in the meantime?