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[RobG]

Can somebody please clarify what hoses go where on the HBV. TIA

[RobG]

Sorry for the bump admins but local garage changed HBV (£15) . Not getting much heat need to confirm if hoses are on correct. Vac pipe is on but not sure if other three are connected right :-/

[Jimbob]

http://www.omegaowners.com/forum/YaBB.pl?num=1192574064

shows the layout

[Andy H]

Took these pictures minutes after taking engine out of my car several years ago.




HTH

[Marks DTM Calib]

Yep, top of the 2 outlets to the matrix, bottom of the 2 outlets to the pipe that has a T in it...one side of the T goes to the engine and the other to the matrix

Inlet pipe to the engine.

[RobG]

Thanks for everyone`s input. Much appreciated

[Marks DTM Calib]

Whats happens is if they are connected wrongly then the valve bypasses the matrix when heat is needed and flows water through when it is not!

Hence, no heat.

[RobG]

Yep, top of the 2 outlets to the matrix, bottom of the 2 outlets to the pipe that has a T in it...one side of the T goes to the engine and the other to the matrix

Inlet pipe to the engine.

Right, pipes are connected as described. Turn C/C off. Engine runs up temp to 92 then fan kicks in. Matrix pipes in footwell are hot. Turn C/C on and call for heat, blows hot and then pipes in footwell go cold. Another thing I`m getting is although I`ve checked everywhere for leaks or poss. headgasket leak and can`t see none whatsoever the coolant level is going down in the expansion bottle to the sensor level and when I release the cap the pressure brings the coolant up to midway between sensor level and "fill" line. So have to keep topping up with 50/50 :-/

[Entwood]

Possibly an air lock ... have you tried "burping" the pipes  .. run engine with cap off and heater set to maximum, sharp squeeze/slow release of biggest water pipe you can get your hand on.

Often shifts a lump of air   

[RobG]

Done that for 15mins still no joy. As Mark said I`ve checked pipes seem right. The one with the T-piece is on the bottom of the "twin" spigots. Can`t understand why alloy matrix pipes get boiling hot with C/C off and then go cold when I switch C/C on and set for heat :-/
As both alloy pipes to the matrix are getting hot with C/C off, would there be an airlock :question

[Entwood]

Guesswork now ..... They get hot under "no flow" conditions simply because the alloy pipes conduct heat ... as soon as you are demanding "flow" the  water being moved is NOT from the "hot" side it seems ..  but why that should be I have no idea ..

Unless it is as previously stated

Whats happens is if they are connected wrongly then the valve bypasses the matrix when heat is needed and flows water through when it is not!

Hence, no heat.

and working "in reverse"

[Andy H]

Do both aluminium pipes go cold?

Did your heating get gradually less effective over time?

Did it stop working suddenly?

My instinct at the moment is that the heater matrix is partially blocked, enough coolant flow goes through (when no air is flowing through it) to get both pipes hot but when cold air cools the matrix one pipe (the outlet) goes cold.

Alternatively the HBV is fitted wrongly so when the Climate system cuts vacuum to it (to allow it to open) it actually starts bypassing (and both pipes go cold).

Have you tried it with the little vacuum pipe to the HBV disconnected? Both pipes should get hot (and stay hot).

You might need to plug the end of the open vacuum pipe to leave enough vacuum for the internal flaps to operate.

[RobG]

Do both aluminium pipes go cold?

Did your heating get gradually less effective over time?

Did it stop working suddenly?

My instinct at the moment is that the heater matrix is partially blocked, enough coolant flow goes through (when no air is flowing through it) to get both pipes hot but when cold air cools the matrix one pipe (the outlet) goes cold.

Alternatively the HBV is fitted wrongly so when the Climate system cuts vacuum to it (to allow it to open) it actually starts bypassing (and both pipes go cold).

Have you tried it with the little vacuum pipe to the HBV disconnected? Both pipes should get hot (and stay hot).

You might need to plug the end of the open vacuum pipe to leave enough vacuum for the internal flaps to operate.

I`ll try it now Andy and post back.

[RobG]

Vac pipe off. C/C OFF. Both alloy pipes are boiling hot. C/C ON warm air when heat is called then alloy pipes go cold and stay cold. Looking around in both footwells. Driver`s side can`t feel/see any leakage. Passenger at the footwell end of centre console, if I pull the end back slightly I can see a sort of bung type thing wrapped in grey/black sponge that is dripping fluid

[Andy H]

C/C ON warm air when heat is called then alloy pipes go cold and stay cold.

Both pipes? I was looking for a big temperature differance as an indication of poor flow due to a partially blocked matrix.

If there is no large temperature difference between the aluminium pipes then I would tend to focus on the HBV or look for a blockage in the coolant bridge area or look for more general causes of poor circulation (air lock or faulty pump etc)

Passenger at the footwell end of centre console, if I pull the end back slightly I can see a sort of bung type thing wrapped in grey/black sponge that is dripping fluid

I wouldn't be surprised to find condensation on the A/C pipes in this area. My last car used to make the carpet wet if I used it a lot in very warm humid weather. Does it smell of antifreeze?