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[dippydave]

snappy title huh. :-?

I've still got a problem with my standard GLS interior heating/cooling system, ie 4 knobs, (it's not climate control, but I don't know what to call it!)

The direction knob doesnt make much difference to where the air comes from - mostly just at the screen. Thoughts previously were that a vacuum pipe had come off, but I can only find five and they are all attached.  :-/

I've had a look on the back of the knob and there are five vacuum pipes - red, green, white, blue and yellow. There is what looks like a sixth position on the dial too. Has anyone got a pic/diag of what order and which lugs these pipes are meant to be on?

While Keith from Coolcar (what a dude ) serviced the aircon the other day, he tried covering the sixth position to no difference. His theory was that the five pipes were all, but in the wrong order.
On a side note, his aircon servicing was great and he took the extra time to look behind the radio at the controls for free

Hayulp please!

[dippydave]

nobody know anything about these pipes? :-/

[dippydave]

Just worked out there's 120 permutations of these five pipes. that's a lot of trial and error! 

[Matchless]

The sixth spigot is a vent to atmosphere so it should be left open.

Have you checked that vacuum is reaching the panel? If you have no vac then non of the switch positions make a difference but if you have weak vacuum (ie a leak in the pipe) then you can get some funny effects.

There is a vacuum reservoir in the scuttle next to the pollen filter. Check it is OK....and that the non-return valve is working. There should be vacuum on its output for several minutes after engine-off. If not check the pipe to the bulkhead for chafing and flat spots where it has worn through.

[dippydave]

The sixth spigot is a vent to atmosphere so it should be left open.

Have you checked that vacuum is reaching the panel? If you have no vac then non of the switch positions make a difference but if you have weak vacuum (ie a leak in the pipe) then you can get some funny effects.

There is a vacuum reservoir in the scuttle next to the pollen filter. Check it is OK....and that the non-return valve is working. There should be vacuum on its output for several minutes after engine-off. If not check the pipe to the bulkhead for chafing and flat spots where it has worn through.

thanks for the advice!! 

it makes sense to be something else as when keith was trying the pipes and selector, covering the vent to air made no difference. you could hear something happening when the selector was moved but not a lot. i'll get me head under the scuttle once it's out from under the engine  8-)

Pardon my ignorance - how do I know which is the out and which is in of the reservoir?! (haven't looked in that area just yet!)

[Matchless]

Pipe from main vacuum pipe goes to non return valve which is recessed into the vacuum tank.

Dont try to pull pipes off the tank, you will only break them, thats if you can get your hand in.
Replacement tanks can be taken from a V6 from the intake trunking.

Look carefully where the pipes pass through the plennum wall. Seen a couple wear through there.