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My Vacume selector valve seems to be leaking

photojoe on Thu June 03, 2010 1:20 PM User is offline

Year: 1989
Make: Pontiac
Model: Grand Am
Engine Size: 2.5
Refrigerant Type: R-12
Ambient Temp: 70 f.
Country of Origin: United States

This same system is used on Buick Skylarks & Somerset, Oldsmobile Achieva & Calais

I replaced this part, with an AC Delco part, which has been discontinued. PN- 1#15-71542 or 1#16054488. Both numbers are on the box.

This is the correct part called out for. I had to go to the Chevy dealer to order.

Anyway, it's a rotary vacuum selector valve, that's connected to a slider. This is the control used to select, AC, VENT, HEATER AND DEFROST. The slider is connected to a gear mechanism, which rotates the the valve. Vacuum lines are connected to the back and held securely with (2) spring washers.

The problem is that it's leaking vacuum in the off position and also in heat and defrost position. There are no symptoms of leaking in the VENT or in the (3) AC positions.

So, my question is, should I put some Vaseline or some other light grease on the fittings, to try to stop the hissing sounds?

Or does anyone have a suggestion?

The other associated problem is, that the position on the selector is not giving me the correct response from the vents. In other words, selecting HEAT, is giving me heat out the dash vents, but very little out the heater vents.

I know this sounds like I don't have the selector slider gears, meshed correctly to correspond to the action. I can also MANUALLY, rotate the vacuum valve to get the air out the correct vents, but it doesn't mesh correctly, so the slider is pointing to the selected vents.

It's weird.

So any ideas, send them my way.



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