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I hope nobody get me wrong, i dont want to offend anybody, but i read the instructions from Billman several times and still dont understand why and how it works.
- Why does it make a difference to shut the engine off?
- Why does the bleeder port at the firewall dont work? What is the reason for this?
Squeezing the radiator hose to build up pressure make perfect sense before you open the Bleeder, to avoid that air get into the system. Same as bleeding the brakes. Allways have pressure in the system before you open the Bleeder.
But, air wich is trapped inside the heater core - the highest point of the System - will find its way DOWN in the LIQUID through the Roller-Coaster of tubes and hoses of the cooling system to the Bleeder at the cylinder head when i stop the engine and squeeze the hose to build up pressure? There is something wich i am missing, or wich i simply dont understand or wich is missing from the instructions. Sorry!
I opend the bleeder at the cylinder head for a short time after i used the LHT method for bleeding, with pressure in the system, all i get was a constant stream of coolant, no air bubbles. And 3 Tankfills after the bleeding, the coolant level in the reservoir is still exactly the same. To me, it looks like all air is out of the system. Maybe i am wrong?
I followed Franzos hint and did annother meassurment. Car was hot, idling. I pointed the laser of the thermometer inside the air channel, through the ventilation grill. After about one minute, i read 96.4 °C / 205.52 °F. Hot enough?
I used a fresh batterey in the Theremomter to avoid missreadings.
What happens when you turn the engine off? The water pump stops working, you stop adding heat into the system. When you squeeze the radiator hose, you reduce the volume in the system, since you can't compress water/coolant, the only thing that gets compressed is air in the system. The cylinder head is the biggest heat sink in the engine since that's where the exhaust valves are, and combustion happens. This is why there's a bleeder on the head, the greatest heat source from the engine is the place most likely to boil coolant and build steam pressure.
So to clarify, the water pump creating water pressure and circulation is what stops the bleeder on the head from being able to purge air. If you remove the circulation/pressure induced by the pump with the nose lifted and the hose squeezed, means the air can move to the highest point in the system ie the head bleed bolt.
So to clarify, the water pump creating water pressure and circulation is what stops the bleeder on the head from being able to purge air. If you remove the circulation/pressure induced by the pump with the nose lifted and the hose squeezed, means the air can move to the highest point in the system ie the head bleed bolt.
To me, this seems to be the simplest solution. Park on a gradient or jack the front of the car up slightly. One foot should do.
05-13-2024, 04:43 AM
