Question about 2003 Lincoln Navigator

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2003 Navigator's A/C doesn't come out of the front vents when gas pedal is depressed. When I let up on the gas, it starts to work? Any thoughts?

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When you depress the gas pedal, you loose vacum that is created by the running mtr. The vent doors are run buy vacum, but normally don't close in this situation due to stored vacum in the vacum pod. This pod is protected from lossing it's vacum by a vacum check valve allowing vacum to be created and not lost unless asked for. I suspect that this valve is broken. If you look at the vac line chart on the radiator, you should be able to find this valve. Once you find the valve take it off the line, you should only be able to blow on way through it.

Posted on Sep 04, 2009


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