So like the title says bit of an odd question?? Just wondering how fast the water pump should be moving coolant thru the radiator?? When I watch with the rad cap off it doesn't look like that coolant is moving very much at all.

Only reason I'm asking is on the last drive I went out on the car hot while at speed but cooled down when it was at an idle. Up until now the cooling system has been flawless.

There's no air in the system. I haven't seen any white smoke from the exhaust. No drips that I've noticed from the weep hole on the pump. It pressures up and holds. No coolant in the oil either. And none coming out when spark plugs are removed

I checked out my brother's car (94 Mustang SBF) and his coolant is moving quickly thru the system when viewed with the cap off.

So do I just have a bad water pump?? What do y'all think?? Thanks guys

 

When the thermostat is closed coolant does not flow through radiator

 

I'm aware of that. Even when it is at operating temp it still looks like it's barely moving I would think I'd be able to see actual flow