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[mong00sehun]

Hi guys,
i have an Omega B2 2.6 V6 elegance, with some issue. So, when i bought a car in 2023 i asked my mechanic to replace the cooler matrix, he did it, everyone is happy. The AC was bad (no gas), so when the temperature is rised around 30°c it was awful to drive long trips because of the heat. But then i noticed something: the whole dashboard is getting hot, and its radiating the heat into the air, and there is a gap next to the accelerator pedal where hot air blowing to my feet. So then, i asked about it, in the hungarian forums and some people told me, maybe my mechanic forget to put some gasket in place, so the heat of the heater matrix can leak into the cabin. Now the AC is ok, its blowing cool air from the vents, but the heat is still the problem.
I read about the HBV what is control the hot coolant to go to the heater matrix or not. If i understand, the coolant always going into the heater matrix, only not, if the ac not in eco mode, and the temp is set to low. Then the climate control opens some vacuum valve and the HBV close, and there is no more coolant flow to the matrix. IN THEORY...
I changed the HBV... I dont know much about vacuum systems. Where can i "steal" some vacuum to shut the HBV?I find this picture about Y26SE vacuum system

but i dont sure where can i cut the line, put a T in it, and test the HBV, and this theory of mine... (sry for bad english solutions  )

[Doctor Gollum]

With no vacuum doesn't it default to closed?

In which case simply pull vacuum line off the HBV to test.

The heat fault can also be caused by faulty or disconnected flap.motor arms sticking the airflow in one position.

[mong00sehun]

no sir, when there is no vacuum, the coolant flowing to the heater matrix
but the flap motors is a good hit hmm...

[TheBoy]

In the guides section there is a pair of vac layout diagrams for both setups - a facelift Omega will be the one with 2 vac tanks - which might help clarify things.  There are quite a few things that can go wrong, including misplumbing after engine work, failed one way valves, and broken t pieces.

If you are getting heat out of the vents, though, that points to an issue with the climate system, as it should still be cool-ish when set to a low temp, even if coolant is flowing through the matrix.