Thread: Direction of water pump

Pick a pipe wich ever is easier the difference will be insignificant

OK thanks

After the water is cooled in the radiator it flows through the bottom hose to the pump inlet and the centre of the pump impeller. The other hose connections to the pump are also inlets. The pump outlet directs water into the jacket of the engine block.

The hot water for the heater comes from the thermostat housing, and returns to the pump inlet.

dont forget to put a small bleeder hole into the valve or never close it completely.

if you have to bleed it up later and forget to open the valve you can wind up with the heater air locked, then when you open the heater valve the air winds up trapped in the system.

if you have the traditional 4bd1 expansion tank setup you can wind up with problems

Originally Posted by Blknight.aus

dont forget to put a small bleeder hole into the valve or never close it completely.

if you have to bleed it up later and forget to open the valve you can wind up with the heater air locked, then when you open the heater valve the air winds up trapped in the system.

if you have the traditional 4bd1 expansion tank setup you can wind up with problems

Thanks Dave. The valve that I have is spring loaded - you push it down to open it and bleed it. Here is a photo of the setup:



If I put a small hole in the T that houses the valve, wouldn't it leak? Would it also be possible to bleed it regularly? I raised the valve up a little to give it more chance of catching air passing.

I have the standard expansion tank (thought it was just an overflow tank tank though? Doesn't seem to be able to suck it back in - is this what you are referring to?)

Thanks!

the hole goes in the mechanism inside the valve that closes it so it never completely closes up like the bleeder hole in a thermostat.

if you have a push to bleed valve or a bleeder installed in the heater line and you bleed from that point, disregard as the heater will be bled up when you bleed the system.

Originally Posted by flagg

I have the standard expansion tank (thought it was just an overflow tank tank though? Doesn't seem to be able to suck it back in - is this what you are referring to?)

Thanks!

I looked inside mine when it was empty and although the hose barb is on top, inside the barb continues as a tube that goes to the bottom of the tank. (Like a straw?) So it can definitely suck coolant back in. Deceiving little tank that one!