Aircon vent flap solenoid valve wanted

[johnb]

Does anyone know where I might find one of these valves or a similar valve with the same function?



It's a miniature 3 way solenoid valve from the A310 and measures approximately 50 mm across the mounting bracket and has 3.5 mm diameter connections. It doesn't seem to be working.

In the first photo the bottom port is connected by tubing to a tee in the vacuum line to the brake servo. The right hand port is connected to 2 vacuum diaphragm/flap units. When the solenoid is energised the bottom and right hand ports should be connected allowing intake manifold depression to the flap units. One flap unit then closes the ventilation fresh air inlet duct and the other opens to allow the ventilation fan to recirculate cabin air through the evaporator. The left hand port doesn't appear to do anything.
In it's de-energised state the right hand port is connected to a vent passage that exits through the middle of the coil to the hole at the top in the second photo. This then allows the diaphragm/flap units to open to atmospheric air and return the flaps back to 'non-aircon' positions. The coil has 2 terminals and is energised when the aircon switch on the dashboard is rotated.

My solenoid seems to be stuck in the de-energised state as I can blow through the right hand port and air exits at the top hole. When connected to a battery it stays in the same state. I've squirted contact cleaner and WD40 into the ports without any effect. Markings on it are 78GG19496AA and F9 02 and the Ford trademark name within the blue oval.

Basically I guess that I need a 3 way, 12V miniature solenoid valve with connections close to 3.5 mm diameter. As it is mounted behind the screen wash bottle in a reasonable amount of space the shape and connection orientations aren't critical. It needs to be reasonably small though.

I can't find it listed in the A310 parts list but the GTA parts list shows item 11 (77 00 855 078) below which might have the same or similar function. I've done some Google searching but not yet found anything other than 2 way valves.

Any ideas or whether the GTA item 11 might do the job and whether anyone has one spare?

That's the anti pollution circuit on a 610 not GTA so I doubt anyone will have one spare .I can have a look and take some pics of one to compare but looks to be just two port ......Could try Simonsays74 or BIGM as there is a 610 breaker around somewhere .

Might be that a turbo amal type valve could be made to do the job ?

[johnb]

That's the anti pollution circuit on a 610 not GTA so I doubt anyone will have one spare .I can have a look and take some pics of one to compare but looks to be just two port ......Could try Simonsays74 or BIGM as there is a 610 breaker around somewhere .

Might be that a turbo amal type valve could be made to do the job ?

Thanks Lee. If the one on the 610 is 2 port then it wouldn't be suitable. From the diagram I wondered whether it had a vent port down the centre of the coil, like the one on mine, that's why I thought it might be suitable.

The amal valve looks a possibility. If in one state it has ports C & W connected and in the other state ports W & R connected then it would do the job. Is that the way it works? For my application then C would be manifold vacuum, W would be to the vent flaps and R would be the atmospheric vent. Do you know what the connection sizes are? If suitable where might I find one?

[johnb]

At the suggestion of JohnC I took the coil out of its holder to see if the valve internals could be dismantled and repaired. The coil was showing continuity, so it was worth trying.

I bent the tabs back and removed the coil assembly. It came apart as shown in the photo but the plunger was stuck explaining why it hadn't worked. It was possible to help the plunger out with a piece of thin wire through the bottom port. The plating on the plunger had some corrosion but once this was cleaned off it was free to move inside the valve. Connecting a battery moved the plunger up and opened the bottom port. Removing the battery feed and the spring pushes the plunger back down and closes the bottom port.

Just now need to check its operation when connected back in to the vacuum circuit when I next run the engine.

Thanks to John for suggesting taking it apart.

.
you mean you don't take things apart for the hell of it anyway?? Lol great stuff, good you have it sorted John.

[johnb]

I do actually Martin but for some reason I needed a prod with this basically simple component.