So it cools fine in traffic/low speeds but gets hot at highway speeds? Is there a coil of wire in your lower radiator hose? If not it can collapse at higher RPM's and cause poor water flow.
Yep. Anti collapse wire in there. Will get hot(190ish), just cruising around at around even at 45 MPH steadily. Head into town hit a bunch of stop lights, comes right down to 175-180'
was told this is a classic sign of not enough capacity.
I personally feel like the electric fan and shroud combo just doesn't let in enough air at cruise speed. My fan turns 2600RPM constant, or so Derale says. At 60 MPH my engine driven fan would have been 3200.(Engine RPM)
I just don't want to give up 40HP or so, with the engine driven fan.