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[Ali Ch]

hi...
 i have omega 2.0L ....when i bought it, she had lots of problems which i managed to fix by reading the forms here and there. one of these problems was the hbv. it was winter (i used to live in a much colder city) and the climate was not working properly. the mechanic said it is the water not circulating inside the heater matrix (he told me that he could tell by feeling the tubes) but he could not find out why....so i took the car home and started digging the forms and i fixed it, the joints ware incorrectly fitted on the hbv. although the air was pretty good and hot and climate control works just fine, but doubts still there about the correct joints connections.
a few months ago i moved south (very very hot whether, now its 48C in the shade) and the climate control is not cool enough. so i took her to an air-conditioner specialist and he fitted a gauge to one of the pipes and after several tests on deferent climate settings he said you have nothing wrong with it...the problem is with the heater never turned off and it prevents the air from getting cold enough.
so the hbv should cut the water from the heater matrix when the temp in the ecc is set to 'low', which i tested the vacuum tube connected to it and it seams to work ok. but even when the temp is set to 'low' i can feel the tubes getting hot about half a min after i start the car. when i think about the current tubes connection it dose not feel right, but i recall when i connected it that was the best fit i could get giving the existed tubes (which is highly probable that these are not the original tubes, but incorrectly fitted just to make it look like its ok) that made the water circulate in the heater matrix.
then i thought if i only have the map or circuit that describes the tubes connection then i could re fit it. i have a haynes manual but could not find any such thing in it, searched the net but nothing useful, so i thought some of you guys can give me a clue or describe how is it connected in your cars. thanks for the help in advance 

[mantamania]

Hi,

What year is your car and which 2L engine do you have?

[RobG]

HBV has one single spigot one side and two the other side. Connect hose from rear of engine to the single spigot. On the double spigot side the top hose from the bulkhead goes to the top spigot and the bottom hose to the bottom spigot

[Ali Ch]

hi and thanks for the reply 

the car is a 1996 with a 2L DOHC petrol (dont remember the exact engine code), the car originally had a 3L V6 but the previous owner changed it, so the engine is for a newer (guessing a 1998) model since it has the 56.5 simtec ECU, but the spark plug cover says ecotec, kind of messy but what can i say!!

the tubing is currently connected similar to what you mentioned except for two things, the top hose is connected to some kind of a pump then from the pump to the top spigot. the bottom hose has a T junction the branch is connected to the bottom spigot and the main hose is connected to the front side of the engine (next to the big hose from the radiator).....is that ok??? if so dose that mean the hbv is not diverting the water, i.e. it has failed???

[RobG]

hi and thanks for the reply 

the car is a 1996 with a 2L DOHC petrol (dont remember the exact engine code), the car originally had a 3L V6 but the previous owner changed it, so the engine is for a newer (guessing a 1998) model since it has the 56.5 simtec ECU, but the spark plug cover says ecotec, kind of messy but what can i say!!

the tubing is currently connected similar to what you mentioned except for two things, the top hose is connected to some kind of a pump then from the pump to the top spigot. the bottom hose has a T junction the branch is connected to the bottom spigot and the main hose is connected to the front side of the engine (next to the big hose from the radiator).....is that ok??? if so dose that mean the hbv is not diverting the water, i.e. it has failed???

Engine code is X20XEV. Everything sounds OK apart from what I`ve highlighted. Whereabouts is this pump, is it electric, does it work. On the 4-pots I`ve had the top hose from the bulkhead goes directly to the top spigot, not sure about the V6 (previously in your car) but I believe they`re the same

[Ali Ch]

it is an electric pump under the expansion tank, it is not connected and there is a jack that fits it close by, but when i connected it nothing happened (i kept it connected for about a week) and never spotted it working despite that i tested it on 12 volts and it works, i looked in the electrical diagrams and in the cooling chapter in hayens manual but did not find it. i asked every mechanic i encountered on what it is but no one seams to know. so i disconnected it.
so what is it for???should i remove it, i think it is harmless since it cant pump water!!

[GaryBC]

The small pump you refer to could be part of the Winter Pack that I believe was an option on some models.

With the engine switched off hit the Auto button on the climate control panel. This activates that small pump so as to circulate residual warm water through the heater matrix and keep the cabin warm.

[Mr Skrunts]

You mention the car has climate control, have at any point you reset it by holding Auto and Off in for atleast 5 seconds to reset the ECU for the climate.

I dont fully understand the climate system as it is fairly complex, but it is obvious that with the climate every thing is electronically controlled, so if a valve is not funtioning at the right time or temperature then you will have a false idea of what you are looking for.


By resetting the climate it at least illimates that part of the equastion, it may well have noting to do with this side of the system but you will have at least checked it. 

[Ali Ch]

thanx for the reply
i just tried the climate with the engine off, when the ignition key is on the acc. the climate won't work but when i turned it to full on (the lights on the dash turn on) it works but the pump still not working, neither the blower (the blower is on auto). so far the tubing is ok, is not it??? and the pump issue won't effect the water cycling???
i tried resetting it, i always do reset it after i do some thing with the car that effects it, disconnecting the battery for example. but that did not help, i hear the noise from the stepper motors when the buttons are pressed, i can hear them when i change the temp on the ECC.
the problem is that i feel the tubes from the bulkhead getting worm when it should not. but even so, it should not effect the air inside the cabinet that much as the ECC should put the air mixture to max cold ( 100%), or so i assume!!!
i just needed to eliminate the ac "specialist" theory that the fault is that the car can't have both cooling and heating systems simultaneously and you should basically cancel one of them (heating in summer and cooling in winter) so you have to pay him a visit twice a year that if every thing is going with no errors.
i took it to lots of garages to take a look at it and heard lots of conflicting theories, from a failed compressor to "it has no coolant at all" despite i saw the "smashed" pressure gauge reads something. maybe i ll try to permanently bypassing the heater matrix and see the results, before i move to see if there is a problem with the ECC. any advice???

[MonzaGSE]

i think that small electric pump is an extra to circulate the water better, and get better heat in the cabin in cold countrys. All Omegas here in Norway has it and it starts just with the ignition on and runs constantly to the ignition is switched off. I would connect ignition power to it if i were you, or remove it completely. I would guess that if the pump is not running its actually obstructing the water flow.

[sjc]

Have you checked the hater by-pass valve is actually moving and not just stuck in one position.

BTW, they're only about £25.

[sjc]

Oh, and if it is stuck and you try to free it off, expect it to start leaking anyway!