Bad/Weak water pump?????

mguner said

Sounds more like aerodynamics to me..... Is the rubber seal between the core support and hood still intact? You should be getting a visible flow at T-stat opening temp of considerable volume as well. They may be on to a thermostat issue as well. Never had a water pump issue other than seals or bearing failure.

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I had considered air flow at high speeds but since I had little to no flow sitting still with the cap off I think that it eliminates high speed aerodynamics?? Although I don't have the rubber seal but it wouldn't help the water flow. There is almost no flow at all with the cap off just very little movement of the water, like someone very, very gently stirring a cup of coffee. I never seen so little flow before. The only water pump issues I've ever had were, bad bearings, loose pulley (worn bearing), or water pump leak.

treblig