Question about 2003 Lincoln Navigator

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Air stops blowing through the vents when accelerating

Upon acceleration, the dashboard vents stop blowing air.. upon mild deceleration, the dashboard vents resume blowing air.

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U have a loss of vacuum to the ac mode control switch, this switch applies vacuum to diff vacuum motors to move air to diff outlets, dash, floor, defrost etc. either the vacuum line or vacuum resivior at the engine is leaking or the mode control is leaking vacuum.

Posted on Aug 14, 2009

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Posted on Jan 02, 2017

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Needle should move a little bit upon stop/go.If it is a lot would have to say it is the potentiometer in the sending unit fuel pump.

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When I start the car, the temperature guage goes to the normal position, the air coming from the heat vents is cold. When I accelerate the temperature coming out the vents rises and when I decelerate the...


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My 2003 Jeep Liberty heater is blowing cold air when idling. Warms up when you hit the accelerator. I also hear a water rolling sound upon take off after idling. Water pump? Heater Core?


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Acceleration no air, foot off gas air barely blows out vents


The vent is controlled by vacuum. Check the condition of the vacuum hose associated with the vent control. What is happening is when you decelerate, the intake manifold vacuum increases, and a diaphram is slightly pulled giving you air in the vent but very little. In normal condition the diaphram wont even pull. Solution is check for a vacuum leak in the vent control trace it coming from the intake manifold.

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Ac blows warm air onb acceleration


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Yeah Ron, the flap that covers the heater core is open and when you're moving the air is pushed over the heater core and into the cab your in. Possibly just a vacuum line of that controls said flap. Check all vacuum lines for good proper connection to these flaps because all of them are vacuum actuated.

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AIR STOPS BLOWING OUT OF VENTS WHEN ACCELERATING ON 99 DODGE RAM W 318 V8 AND CONTINUES ONCE CRUISING SPEED IS REACHED OR DECELERATION


On the side of the intake there is a one way check valve in a vacuum line to the vent controls. Replace it

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