My air con has lost it mind!!

[11gothevt11]

Hi all
My air con seems to have lost its mind
When the air con is on hign and on the dash...It will work for a few minutes than by itself just go to the windscreen
How can i fix this???
Thankyou

[Dayvo]

The controls for the vents and screen are vacuum operated , maybe there is a leak in one of the hoses

[11gothevt11]

The controls for the vents and screen are vacuum operated , maybe there is a leak in one of the hoses

How do i find this leak??

[Dayvo]

Stick you ear close to the control and hear if you can hear any hissing coming from it . ( i don't mean to literally stick your ear to it but you get the idea )

[50LTRv8]

Is this when you use the throttle say up a hill?

[11gothevt11]

Is this when you use the throttle say up a hill?

I do alot of city driving can't realy remember if its when throttle is pressed

What could cause this with the throttle??
Please tell me more??

[PRAVX II S]

Could be the one way vacuum check valve.
Located near the firewall right behind the motor.
You will see a skinny hose on the back of the inlet manifold follow the hose and you will see a white valve.

[drift-it]

mine sorta does the same thing. on long highway drives it changes itself to the screen. and changes back when i overtake.

[11gothevt11]

mine sorta does the same thing. on long highway drives it changes itself to the screen. and changes back when i overtake.

Does your car only do it when its on hi???

[lufkin]

my calais does it whenever i accelerate, some have said it can be the bank of solenoids under the glove books, just wish there was a way i could diagnose before spending money on a new bank

[11gothevt11]

This is the first vt i have owned
Is it normal in a vt When you start the engine the air con takes a few seconds to come out of the dash vents????

[drift-it]

well when it on high it gets to cold so i turn it to low and then forget about it. and then it gets hot so i turn it back up to 2 or 3. then realise its on the screen.

[11gothevt11]

This is the first vt i have owned
Is it normal in a vt When you start the engine the air con takes a few seconds to come out of the dash vents????

Anyone have any more ideas??

[50LTRv8]

Take a look at this, my issue was the actuator

How to change aircon actuator in VT

[11gothevt11]

Take a look at this, my issue was the actuator

How to change aircon actuator in VT

Thanks heaps for the info great read
Just a question how did you find out that this was the problem???????????
Leaking air around this actuator?????
So yours had same problem diverting to windscreen??

[50LTRv8]

Thanks heaps for the info great read
Just a question how did you find out that this was the problem???????????
Leaking air around this actuator?????
So yours had same problem diverting to windscreen??

I checked the other hoses first, I could hear a hiss coming from the actuator (losing vacume). Yep, had the air dirverting to the screen issue on throttle up a hill, hence the writeup when I changed mine