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The local Kia dealership located a leak at the top plug (Transmission Fluid visible on top of the transmission directly below the place where you add brake fluid) on my 2003 Kia Spectra. They charged me $92 for the full diagnostic test to determine where the leak is. This model is somewhat similar but not identical to Sedona. They cannot repair the leak (not serviceable without replacing the transmission with a rebuilt unit) so I am proposing to use alternate methods to stop the leak (leak sealer added to fluid to recondition the hardened seals and other attempts to seal up an area around the seal to "reduce" but not completely stop the leak because vehicle is no longer worth $1600 repair. Your Sedona may be leaking from the pan gasket (relatively inexpensive to replace gasket and you should first slightly tighten pan bolts) OR from the drain plug (rarely) or from the front or rear seal (both replacements for these are expensive). My car, when purchased brande new, had a defective transmission and had to be replaced along with torque converter with rebuilt transmission (no new ones available) and I was unable to persuade the dealer to locate a new transmission instead. My hunch that I would experience more problems was correct. I have 155,000 miles on the vehicle.

--Update 7/26/2012. I was able to keep treating the transmission with leak sealer and had 197,000 miles on the vehicle before it was wrecked by my daughter when she attempted to avoid hitting a deer (nobody hurt). The transmission continued to function normally despite the leak.

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Q: Why would transmission fluid leak from a 2003 Kia Sedona?
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