Omega Owners Forum
Chat Area => General Car Chat => Topic started by: fcc-pt on 26 June 2015, 18:20:53
-
Loss of coolant and difficults in getting back to normal temperature in hot days.
The temperature raises to 95cº while running at 80km/h, even gets a little lower above 100km/h.
No oil in water no water in oil, no signs of water in the exhaust system!
The big hose that connects the engine to the radiator gets hard and the leak is not perceptible.
I can see remains of coolant on the engine starter...
I've changed the timing belt kit and water pump.
Coolant changed etc etc.
I've got the main vaccum hose broken, does it matter?
What's happening?!?
-
Loss of coolant and difficults in getting back to normal temperature in hot days.
The temperature raises to 95cº while running at 80km/h, even gets a little lower above 100km/h.
No oil in water no water in oil.
The big hose that connects the engine to the radiator gets hard and the leak is not perceptible.
I can see remains of coolant on the engine starter...
I've changed the timing belt kit and water pump.
Coolant changed etc etc.
I've got the main vaccum hose broken, does it matter?
What's happening?!?
Starter is right ( as you sit in the car) rear in the engine bay, as is the hbv which is sited above it. Heater by pass valve is a very common failure and cause if water leaks on omega.
While the leak may not be too bad, it "may" still be allowing the system to depressurise enough to allow the temp to rise. Although a rise in engine temp is not something I personally would associate with a leaky hbv. ....so it may just be a leak in that area.
What year is your mv6?
-
1998
Left side driver seat, starter in on the left I guess...
What's hbv?
-
Heater Bypass Valve
-
1998
Left side driver seat, starter in on the left I guess...
What's hbv?
Starter still on right... Only steering wheel, brake servo, wiper motor and pollen filter are sided ;)
-
1998
Left side driver seat, starter in on the left I guess...
What's hbv?
Starter still on right... Only steering wheel, brake servo, wiper motor and pollen filter are sided ;)
than i guess it's the alternator... :o
either way i see remains of coolant on the left side (seated position)
Heater Bypass Valve needs vacuum to operate?
-
Yes. It's activated by the ac, so to test it needs vacuum and the climate control cycled from hi to lo while checking for coolant leaks.
-
Yes. It's activated by the ac, so to test it needs vacuum and the climate control cycled from hi to lo while checking for coolant leaks.
So I supose if vacuum is broken then the valve won't work.
Does the valve affects the temperature or it's only there for AC?
Is this the valve?
(http://i.ebayimg.com/00/s/NjI3WDYyOA==/z/F9QAAOSwymxVP-Ul/$_12.JPG)
-
Yes. It's activated by the ac, so to test it needs vacuum and the climate control cycled from hi to lo while checking for coolant leaks.
So I supose if vacuum is broken then the valve won't work.
Does the valve affects the temperature or it's only there for AC?
With no vacuum the valve will only flow through one port. It needs vacuum to move the flow to the other outlet port. It switches flow away from the matrix when ac is on, As I understand it.
You could apply vacuum manually or by other means. Say attach a hose and suck.
-
Yes. It's activated by the ac, so to test it needs vacuum and the climate control cycled from hi to lo while checking for coolant leaks.
So I supose if vacuum is broken then the valve won't work.
Does the valve affects the temperature or it's only there for AC?
With no vacuum the valve will only flow through one port. It needs vacuum to move the flow to the other outlet port. It switches flow away from the matrix when ac is on, As I understand it.
You could apply vacuum manually or by other means. Say attach a hose and suck.
To the vacuum nipple on the hbv I mean, not a coolant pipe. Yuck ;D ;)
-
To the vacuum nipple on the hbv I mean, not a coolant pipe. Yuck ;D ;)
niples :D
I need the hose that goes from the inlet manyfold to the brake servo.
Where can I get it?
-
Um, ignore me if I'm being stupid, but doesn't a hard radiator top hose suggest a head gasket problem?
Ron.
-
Um, ignore me if I'm being stupid, but doesn't a hard radiator top hose suggest a head gasket problem?
Ron.
hope not, but there is a huge probability
-
Does the HBV affects pressure on main rubber hose?
-
1998
Left side driver seat, starter in on the left I guess...
What's hbv?
1998(/99?) do tend to suffer hg issues. Usually left side behind the dis PAC bracket behind cylinder 6. But i guess it's best to count out the simple things first.
-
1998
Left side driver seat, starter in on the left I guess...
What's hbv?
1998(/99?) do tend to suffer hg issues. Usually left side behind the dis PAC bracket behind cylinder 6. But i guess it's best to count out the simple things first.
:-\ I guess you right, i need the vacuum hose and I can't get it anywhere, any ideias?
-
1998
Left side driver seat, starter in on the left I guess...
What's hbv?
1998(/99?) do tend to suffer hg issues. Usually left side behind the dis PAC bracket behind cylinder 6. But i guess it's best to count out the simple things first.
:-\ I guess you right, i need the vacuum hose and I can't get it anywhere, any ideias?
As yours us left hand drive, I don't think any where in the UK will have one suitable. German eBay? A breakers/car dismantles, for a used one. ...?
-
Is there any part number website or pdf etc for omega?
This is the hose
http://workshop-manuals.com/vauxhall/omega-b/h__brakes/brake_hydraulics_brake_lines/vacuum_hose/repair_instructions/vacuum_hose_remove_and_install_(vehicles_with_v6_engine)/ (http://workshop-manuals.com/vauxhall/omega-b/h__brakes/brake_hydraulics_brake_lines/vacuum_hose/repair_instructions/vacuum_hose_remove_and_install_(vehicles_with_v6_engine)/)
-
How many Heater Bypass Valves there are?
I only see one at the front near the radiator and fan, but i suppose you're refering to the one on the back of the engine, right?
-
There is only one.
Your looking at a multi ram, also vacume operated. But not the same at all.
Hbv is right at the back of the engine, under the scuttle. You can't see it normally. But it does sound like you will need to remove the scuttle to see what's going on back there.
-
I'm a complete noob on the matter... do I need any special tools?
Beffore taking appart the intake manyfold I will repair the vacuum tubes.
The problem is where to get the tube... ebay.de not having.
-
Another case happily closed!
The loss of coolant was due to a small hose that connects the engine to the HVB.
The hose it is broken, has a cut that only opens when pressure rises... my advice is:
Change all the hoses close to the engine as they suffer from excess wear due to high temperatures and engine vibration.
So if you get loss of coolant first:
- put an eye on the floor
- if you find water on the floor check the position
- if it points to the back of the engine possible malfunctions are: HBV, Hoses or Heating radiator
- if it points to the sides check all the hoses again plus head (it can be cracked)
- also check for damaged hose or expansion tank
- expansion tank cap also gets broken very often
- if it points to front than check the front radiator the water must be hot on the main hose that comes from engine and the bottom hose must be less hot
- also check the fan and please at this stage the car must be running so be wise and do not put your hands or objects near the fan has it can get serious damages!
- use gloves and protect your eyes!
- do not give up and you will get to the promise land :)
This is my little contribution to you guys.
Beware!