Not often I agree with Turk [ post #87 ], but he is 100% correct & I have also posted the same FACTS earlier in this post.
The water-too-fast myth has been debunked by scientific testing. Howard Stewart, the original founder of Stewart Water pumps, built his own water pump dyno/testing rig & tested all this stuff. He was not the only one. When the load on the engine was increased [ causing more heat build up ] with say, air con, car companies used smaller pump pulleys &/or more efficient pumps to pump water FASTER.