coolant fill

my upper hose seems to be empty too. No cooling ir other issues here. Whats the problem?

The coolant is pumped from the bottom of the raditor and returns back to the top out of the filler neck and into the top of the radiator. The whole idea of not having air in the system applies only to the passages inside the block. Air pockets can develop in those passeges, which can cause overheating because there is not enough fluid in the system. A cooling system does not operate like a brake system, which will not work properly with the smallest amount of air in the system. You don't 'bleed' a cooling system. It's not hydraulic. There needs to be some air space in the top of the radiator because the whole system operates under the same principle as a pressure cooker to raise the boiling point of water. You don't fill the system with coolant via the upper radiator hose. You fill it through the...you guessed it...filler hole in the radiator.

Have you replaced your filler cap recently? That regulates the pressure of the system. If you are losing coolant, you may have other issues.

well said. If you are losing coolant but not leaking it, you likely have other problems you are not yet aware of

As long as the highest point in the system is the middle of the outbound (pressure) hose, and the air is trapped there, it can do no harm.

Newer cars need to be bled/burped usually because low hoods put the top of the radiator lower than parts of the engine itself, and/or the top radator hose is the inbound hose, and therefore will push air into the engine to get trapped.

The lower hose is your inbound (suction) hose. Make sure it is firm and/or has a support spring inside. It can suck shut if it gets soft, depriving your engine of cool water flow.

Missouri Rodder said:

When i fill the system as best i can, it just discharges all coolant below the radiator cap into the overflow tank and onto the ground.

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