Question about 1999 Dodge Ram

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Air conditioner doesn't blow from right vents. keeps alternating from top to bottom to face vents on its own, most changes occur during acceleration.

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The air/duct controls on this are vacuum operated and you most likely have either a leaky vacuum line or a bad vacuum check valve. When the engine is running at a steady cruising speed there will be quite a bit of vacuum in the intake manifold and thus in the vacuum lines and control system. This vacuum is held there by a check valve so when you are accellerating and the intake vacuum drops you won't lose this vacuum. If there is a leak or the check valve is bad then as the vacuum drops the air doors move to the default position which is where the air is directed to the defrost vents. The vacuum line under the hood is usually black plastic and about 1/8" diameter. The line and check valve are on the right side of the intake manifold area towards the rear. I'd start my search there as that's where you'll probably find your problem. Hope this helps!

Posted on Jul 15, 2010

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For a cheap fix if you can't find the leak you can install an additional vacuum reservoir. It won't make the problem go away but with the additional vacuum storage it will take longer before the vents loose vacuum.
Way back when, car makers used metal HI-C (the juice) cans, now you'll find a black ball about 3-5 inches in diameter as the vacuum reservoir.
Tip: You can use a short piece of hose put up to your ear, block your other ear and move the other end of the hose around the engine compartment to locate leaks or other noises you can't figure where there coming from.

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