Coolant Refill After Flush

[SnowDrifter]

Sorry I didn't see this earlier.

If you're doing a deep drain of the system - water pump, freeze plugs, or letting it sit with the hoses disconnected for a while, you want to fill it by disconnecting the top hose from the radiator and pouring into said hose. Else the water pump gets air locked.

 

[mattbta]

Sorry I didn't see this earlier.

If you're doing a deep drain of the system - water pump, freeze plugs, or letting it sit with the hoses disconnected for a while, you want to fill it by disconnecting the top hose from the radiator and pouring into said hose. Else the water pump gets air locked.

So how do you know if it's air locked and what's the remedy?

 

[SnowDrifter]

So how do you know if it's air locked and what's the remedy?

It'll overheat

Remedy is to pull your upper hose off the rad and dump some coolant down there

Or vacuum fill

You can technically speaking run it and it'll resolve itself when the coolant boils and shifts enough fluid around to get caught by the pump and go. But your engine won't thank you for that.