Charge cooler pump - does it have to be at lowest point?

[Pupp]

Trying to find a home for a charge cooler pump on a new install... perceived wisdom is it should be at lowest point on the cooler circuit, but best physical place on the car is quite toward the top. Assuming it is bled properly so all air is excluded (big assumption I know), any views on whether it will work (ie circulate coolant without cavitating)? Car water pumps are often pretty well up on the circuit height, no?

[Mikey G]

Most engine water pumps are low to mid way up the circuit. I noticed the auxiliary electric water pump fitted to most VAG cars are quite high in the water circuit near the top of the radiator.
But the lower the better as long as you have some sort of gravity feed for the pump to work with, the more the pump has to pull water the more chance of cavitation and air locks.

[stevieturbo]

Car pumps are mounted where it is practical really.

As long as all air is removed, I wouldnt worry too much.

just make sure it is a decent quality pump with plenty of flow. No weedy little pumps.

[anonymous-user]

It will be easiest to bleed if the pump is vertically below the header tank, and quite close to it. However, as the flow rate is quite slow, assuming you don't have a long and tortuous layout (i.e rear engine, front LTR etc) it should bleed up fine. Ideally, you would include a small air bleed from the highest point in the circut post CC water exit, as that would enable the system to self bleed during operation (and in case you ever boil the system, which you can do if it is not presurised etc)

[Pupp]

Thanks all; very helpful - it is a decent sized pump, hence why finding a likely home for the blighter is proving a challenge.