I have a 2005 4-wheel drive Expedition. Recently I've noticed that when I accelerate, the A/C quits blowing. It sounds like the fan is still blowing but nothing comes from the vents. The moment I let off the gas pedal it resumes blowing and the air is always cold. Weird huh...
Expedition A/C Problem
- Thread starter simple
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I think every car or truck I've owned has done this to some degree. The air vents are usually controlled by a door/valve which gets its control from engine vacuum, and also a spring to preload it in the closed position.
When you step on the gas the vacuum is temporarily lowered and a spring will close the door that sends the air to the upper air vents. Usually there's a vacuum canister somewhere under the hood that stores vacuum and prevents this from happening. However sometimes that's not enough, or sometimes there's a broken hose or cracked canister.
I haven't had my Expedition long enough to find the canister yet. Maybe someone else will also reply with better info.
When you step on the gas the vacuum is temporarily lowered and a spring will close the door that sends the air to the upper air vents. Usually there's a vacuum canister somewhere under the hood that stores vacuum and prevents this from happening. However sometimes that's not enough, or sometimes there's a broken hose or cracked canister.
I haven't had my Expedition long enough to find the canister yet. Maybe someone else will also reply with better info.
Thanks, that makes sense and I'll have it checked.
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