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Air con issue, only coming out of demister

Goolz96

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Hi guys. For some reason, I only get air coming out of my demister vents. I won’t have any air (whether hot or cold) come out of my fascia vents or door vents. Climate control is plugged in but still only blows out the demister. Doesn’t matter what fan setting it’s on either.

Any reason this might be?
VY Berlina series 2 V6
 

accentstencil

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No vacuum. Check the thin vacuum hose is connected behind the intake manifold and the one connected to the heater tap.
 

Nut Kracker

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As accentstencil said above.
A loss of vacuum to the controls, will automatically default the air flow to the windscreen demister.
 

Goolz96

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I’ll check those things. Thanks guys
 

krusing

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Being the vehicle is a Berlina [this also includes Calais], you will have Climate Control!

I had a similar issue with my 2002 VY Calais Climate Control,
the Air would not come out of the "DASH AND SIDE VENTS"
And for a few years, it was so annoying,
So I said, I am going to find this fault, even if I have to pull the Dash out!!!

Well persistence paid off !
and no I didn’t have to pull the dash out !
but
I did pull part of it apart.

Under the Clove box at the back, against the fire wall, [you will need to remove the under-dash cover]
There is a Vacuum Manifold Unit [aka: Vacuum Solenoid Pack], with vacuum solenoids are mounted onto a Circuit Board,
You will see with a few different coloured pipes connecting to the front of it,
[one comes from the Vacuum Tank, the others go to the HVAC actuators]
Images 1 & 2
They just pull off easily, and are of a maluable type plastic.
Remove the Solenoid Pack, [2 screws]
and you can easily open it up, and see the solenoids. [in the next comment]

Some how condensation/moister can leak/get in to it, and corrodes the tracks on the circuit board, so hence they can fail to operate.

I used a [digital] multi-meter and checked the continuity between each side of the solenoids to the connector at the end, by following
the tracks.
And found the return [negative] track on the dash vacuum solenoid was damaged,
so I got a piece [1 strand of 4 core phone wire - Black], and soldered in place from the solenoid to the connector plug,
I secured it to the back of the circuit board, with dab of silicon in a few spots,
and used the same route as the circuit board track.
And it hasn’t faulted since.

Hope the atachments helps.
 

Attachments

  • Climent Control Vacuum Solenoids.pdf
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  • VSP 01.jpg
    VSP 01.jpg
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  • VSP 02.jpg
    VSP 02.jpg
    84.3 KB · Views: 746
Last edited:

krusing

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I found my spare Vacuum Solenoid Pack, that I purchased from the Wreckers a little while ago,
I have sitting on the shelf in the garage in the event a solenoid fails.
[This is not the repaired one],
but you can see what I meant about the tracks on the circuit-board.
 

Attachments

  • VSP 03.jpg
    VSP 03.jpg
    65.3 KB · Views: 436
  • VSP 04.jpg
    VSP 04.jpg
    111.5 KB · Views: 410
  • VSP 05.jpg
    VSP 05.jpg
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krusing

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Last edited:

krusing

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Hi guys. For some reason, I only get air coming out of my demister vents. I won’t have any air (whether hot or cold) come out of my fascia vents or door vents. Climate control is plugged in but still only blows out the demister. Doesn’t matter what fan setting it’s on either.

Any reason this might be?
VY Berlina series 2 V6

First check that you have a Vacuum at the Vacuum Solenoid Pack,
If so, it would indicate that would be a your starting point,
If there is not vacuum at the Vacuum Solenoid Pack, check the Vacuum Tank Pipes/Hoses and fittings,
Then back trace the vac pipe to the mainifold.

Unless its electrical, then thats a different starting point.
 
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