Well about to start the Tstat replacement project tomorrow in my 115 V4( much knuckle busting expected) then this morning a buddy tells me it might be my water deflectors causing the overheat....WTH! Called a local mechanic and he said the heads have to be removed to check the deflectors. Question: is this true and is there a tell-tell way to determine if my problem is Tstat vs deflectors? I have the repair manual for this model but cannot find where and how to repair water deflectors... Most tell me always start with Tstat and then worry about the latter if overheat problem continues.