VK vacum and stuff

[85berlina]

Hi guys,
This is probably a question that Scott will be able to answer so lets see how we go.

I am in the middle of totally redoing my A/C.
I have always had this problem where the vacum motor for the center vent only opens half way. I noticed that this motor has two inputs. The one on the end will pull the push rod half way when vacum is applied and the one on the side will leak vacum when vacum is applied unless the pushrod is pushed halfway in. Then it will hold the pushrod at halfway. When these two are combined, the pushrod will retract all the way but this will only happen if you push the push rod more than half way in by hand because the input on the side leaks until the pushrod is more than halfway in the bore.
So, is this normal?

Also, for everyone with a VK. When the headlights are on, if you turn the brightness control down for the dash lights, do they turn off when they are turned down all the way.

Thanks heaps

[synoptica]

To your second question - no, they just go really dim

If yours turn off, I'd blame it on a dodgy rheostat.

[308vkcalais]

Hi guys,
This is probably a question that Scott will be able to answer so lets see how we go.

I am in the middle of totally redoing my A/C.
I have always had this problem where the vacum motor for the center vent only opens half way. I noticed that this motor has two inputs. The one on the end will pull the push rod half way when vacum is applied and the one on the side will leak vacum when vacum is applied unless the pushrod is pushed halfway in. Then it will hold the pushrod at halfway. When these two are combined, the pushrod will retract all the way but this will only happen if you push the push rod more than half way in by hand because the input on the side leaks until the pushrod is more than halfway in the bore.
So, is this normal?

Also, for everyone with a VK. When the headlights are on, if you turn the brightness control down for the dash lights, do they turn off when they are turned down all the way.

Thanks heaps

I think the rod you are talking about is the rod that operates the exterior bonnet cowel vent.Mine came off & I had a severe vacuum leak & a strange hissing noise in the passenger footwell.If it's leaking I'd look at the actuator thingy.

[85berlina]

I am talking about the actual vacum motor with a push rod that sticks out the end. It is the one that controls the center vent.
Does anyone have any idea on how the delay valve thing that is in the middle of the hose going to this vacum motor work at all.

[vkberlina]

I have been a bit busy to visit the forum lately, I have an aircon how to on my site which gives info on how to connect up the vac lines correctly for the vents to all work.
One tip before connecting it all up, suck on the hose for each vac actuated diaphram and make sure it doesnt leak air, if it dowes it could cause problems for you.

cheers
Scott

[craigvk]

Also, for everyone with a VK. When the headlights are on, if you turn the brightness control down for the dash lights, do they turn off when they are turned down all the way.

Thanks heaps

It's supposed to turn the dash on and off. In my VK, if I turn the lever down, it does nothing! Just a dud rheostat.
You can replace them. One day I will and I'll let you all know how it goes.

[85berlina]

Its all good.
It turned out to be the delay valve. I was amazed that Repco stocked them and they were only $10.
Thanks anyway