Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: polilara on 01 February 2012, 07:22:22

Title: What does the HBV do and when
Post by: polilara on 01 February 2012, 07:22:22: Hello

It is understood that cooling liquid can bypass the heater or go through the heater. I understood that the heater air temperature is controlled by mixing the heated air and fresh air. Is the water temperature in the heater controlled by this valve or is it just on-off ?
Title: Re: What does the HBV do and when
Post by: Abiton on 01 February 2012, 07:49:14: On/off.
Vacuum to it - coolant bypasses matrix
No vacuum to it - coolant sent through matrix.
Title: Re: What does the HBV do and when
Post by: polilara on 01 February 2012, 08:08:25: OK, now that is clear.

But why is it needed at all ?

In winter time heat is needed and in summer time when AC is on the temperature is controlled by heater ??

Why the HBV is there at all ?
Title: Re: What does the HBV do and when
Post by: Abiton on 01 February 2012, 08:42:03: It isn't really needed.

Our car left the factory without one (and I'm extremely grateful for it).

It's just that even without 'using' the heat of the coolant in the matrix by blowing air through, some of the heat soaks out into the cabin. This is then in direct opposition to the efforts of the AC system, wasting energy. So the HBV is put in for all AC-equipped Omegas, unfortunately it was never engineered sufficiently to be reliable!
Title: Re: What does the HBV do and when
Post by: 2woody on 01 February 2012, 10:05:01: Quote from: Abiton on 01 February 2012, 07:49:14
On/off.
Vacuum to it - coolant bypasses matrix
No vacuum to it - coolant sent through matrix.

vacuum supplied to it ONLY when a/c is "on" and BOTH driver and passenger temperature selection is showing "LO"
Title: Re: What does the HBV do and when
Post by: omega3000 on 01 February 2012, 10:08:20: Interesting , i have bypassed my air con and fitted a non air con belt so would i need the HBV at all ...if not i can simply remove the thing :-\
Title: Re: What does the HBV do and when
Post by: tigers_gonads on 01 February 2012, 10:09:48: Quote from: 2woody on 01 February 2012, 10:05:01
Quote from: Abiton on 01 February 2012, 07:49:14
On/off.
Vacuum to it - coolant bypasses matrix
No vacuum to it - coolant sent through matrix.

vacuum supplied to it ONLY when a/c is "on" and BOTH driver and passenger temperature selection is showing "LO"

Is that the same on all years ?
My shed is a pre facelift without all this fancy climate stuff but it has aircon ?
Title: Re: What does the HBV do and when
Post by: 2woody on 01 February 2012, 10:14:09: Quote from: tigers_gonads on 01 February 2012, 10:09:48
Quote from: 2woody on 01 February 2012, 10:05:01
Quote from: Abiton on 01 February 2012, 07:49:14
On/off.
Vacuum to it - coolant bypasses matrix
No vacuum to it - coolant sent through matrix.

vacuum supplied to it ONLY when a/c is "on" and BOTH driver and passenger temperature selection is showing "LO"

same all years

Is that the same on all years ?
My shed is a pre facelift without all this fancy climate stuff but it has aircon ?
Title: Re: What does the HBV do and when
Post by: 2woody on 01 February 2012, 10:14:52: Quote from: eatmydust on 01 February 2012, 10:08:20
Interesting , i have bypassed my air con and fitted a non air con belt so would i need the HBV at all ...if not i can simply remove the thing :-\

yes, but mind you get the proper hoses from GM - about £30 last time I did it
Title: Re: What does the HBV do and when
Post by: omega3000 on 01 February 2012, 10:18:13: Quote
GM - about £30
:o :o :o

Ok thanks :y