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[Muroman]

Hello,

I'm trying to understand the cooling system. X30XE.

There is a extra pump installed under coolant tank.
Hose coming in comes from HBV and also the same hose goes to back of the engine where the aluminum pipe goes.
Hose going out goes straight to heater.

The hose coming from heater goes to HBV.

There is then one hole in HBV left and it goes to coolant bridge.

So what the HBV really does? Which intake/out take it blocks/unblocks when vacuumed/not vacuumed?
And also what controls the vacuum?

-Mika

[Muroman]

And also does this look like right to you?

https://www.dropbox.com/s/i4rut2jbfwz8zbp/omega.png?dl=0

[Kevin Wood]

And also does this look like right to you?

https://www.dropbox.com/s/i4rut2jbfwz8zbp/omega.png?dl=0

Yes, but you've got some of the arrows backwards.

Water emerges from the coolant bridge into the HBV. From there, depending on the state of the HBV, it can either return straight to the coolant transfer pipe and back into the engine, or flow via the little electric pump and heater matrix and then back into the transfer pipe. So, the HBV is able to divert flow away from the heater matrix when maximum cooling of the cabin is required.

The electric pump runs to allow coolant circulation around the heater matrix after the car has been shut down as part of the "winter pack" feature, It may also run to increase coolant flow when the engine is running. I've never checked.

[Muroman]

And also does this look like right to you?

https://www.dropbox.com/s/i4rut2jbfwz8zbp/omega.png?dl=0

Yes, but you've got some of the arrows backwards.

Water emerges from the coolant bridge into the HBV. From there, depending on the state of the HBV, it can either return straight to the coolant transfer pipe and back into the engine, or flow via the little electric pump and heater matrix and then back into the transfer pipe. So, the HBV is able to divert flow away from the heater matrix when maximum cooling of the cabin is required.

The electric pump runs to allow coolant circulation around the heater matrix after the car has been shut down as part of the "winter pack" feature, It may also run to increase coolant flow when the engine is running. I've never checked.

Which of the arrows are wrong ? Because if I change something that kind of means that the electric pump is installed in wrong flow direction?

[Kevin Wood]

And also does this look like right to you?

https://www.dropbox.com/s/i4rut2jbfwz8zbp/omega.png?dl=0

Yes, but you've got some of the arrows backwards.

Water emerges from the coolant bridge into the HBV. From there, depending on the state of the HBV, it can either return straight to the coolant transfer pipe and back into the engine, or flow via the little electric pump and heater matrix and then back into the transfer pipe. So, the HBV is able to divert flow away from the heater matrix when maximum cooling of the cabin is required.

The electric pump runs to allow coolant circulation around the heater matrix after the car has been shut down as part of the "winter pack" feature, It may also run to increase coolant flow when the engine is running. I've never checked.

Which of the arrows are wrong ? Because if I change something that kind of means that the electric pump is installed in wrong flow direction?

You have the flow direction through the heater matrix and pump reversed, and also in the bypass leg that flows from the HBV to the transfer pipe.

[Muroman]

If you agree with this picture, it means that my electric pump has been installed wrong all along....

https://www.dropbox.com/s/h7ts4ztrj5ps3l6/omega3.png?dl=0

EDIT: But now if the HBV is closed the pump can't get water from anywhere?

[Bojan]

That auxilliary pump is activated by climate control, only when the engine is off, and you set the temp to HI (which also opens the HBV fully).
It doesn't work when the engine is running.

[Muroman]

That auxilliary pump is activated by climate control, only when the engine is off, and you set the temp to HI (which also opens the HBV fully).
It doesn't work when the engine is running.

There must be other situations too because mine is running even when Engine is running?

[Bojan]

There must be other situations too because mine is running even when Engine is running?

When climate control on HI, or in some other situations, too?
BTW, don't rule out the fact that some previous owner/garage messed up the wiring.

[Muroman]

There must be other situations too because mine is running even when Engine is running?

When climate control on HI, or in some other situations, too?
BTW, don't rule out the fact that some previous owner/garage messed up the wiring.

I need to verify the situations.

But about the HBV still so is there vacuum when it flows to heater matrix and no vacuum when it goes to engine?
Because that how it looks like when you look at it in pictures.

[Muroman]

The reason why asking all of this and trying to understand the flow, vacuum and HBV is because I'm going to buy a hose heater and it comes to same place as the electric pump is now.

I need to understand the flow before installing the hose heater, otherwise it will break something because it has own pump in it.

When engine and ignition is off, in which state is the HBV? Does it matter in which setting you leaved the heater controls before shutdown?

[Kevin Wood]

OK, the HBV is vacuum operated and without vacuum (engine off) the position of the valve is such that it allows flow through the heater matrix. When vacuum is applied, it bypasses the heater matrix.

This probably means that you can plumb the pre-heater into the circuit where the pump currently is and it will work fine, since it only runs when the engine is stopped.

As to the direction of flow of the pump, I ditched mine a long time ago so I can't check but, if it only operates with the engine stopped, I guess it probably doesn't matter which direction it pumps.

If the climate panel is configured not to have the pump installed, the pump runs all the time, I believe. Could it be that the climate panel has been swapped, or maybe it has the wrong config?

[Muroman]

OK, the HBV is vacuum operated and without vacuum (engine off) the position of the valve is such that it allows flow through the heater matrix. When vacuum is applied, it bypasses the heater matrix.

This probably means that you can plumb the pre-heater into the circuit where the pump currently is and it will work fine, since it only runs when the engine is stopped.

As to the direction of flow of the pump, I ditched mine a long time ago so I can't check but, if it only operates with the engine stopped, I guess it probably doesn't matter which direction it pumps.

If the climate panel is configured not to have the pump installed, the pump runs all the time, I believe. Could it be that the climate panel has been swapped, or maybe it has the wrong config?

Okay, also one more: is it on/off or can it be in some case like 50% open/close?

Is it easy to find out what is config the climate panel has?

Car is brought to Finland from German in early 00s, so there might be some issues with it.

[Kevin Wood]

No. The HBV is either in one state or the other. It probably only bypasses when maximum cooling is required, because normally some heat is used in addition to air conditioning even in summer to achieve the desired temperature at the vents.

A tech 2 is required to check the climate panel config.

I removed my electric pump when I fitted LPG and haven't noticed any issues with heating. I'm guessing that you rely more on the heater in Finnish winters, however!

[Muroman]

No. The HBV is either in one state or the other. It probably only bypasses when maximum cooling is required, because normally some heat is used in addition to air conditioning even in summer to achieve the desired temperature at the vents.

A tech 2 is required to check the climate panel config.

I removed my electric pump when I fitted LPG and haven't noticed any issues with heating. I'm guessing that you rely more on the heater in Finnish winters, however!

Thank you, I'll probably inform what did I do.