I have a 1996 C280 that stops blowing out of the center vents when you push on the accelerator. I had this problem about 2 years ago and traced the problem down to a cracked vacuum manifold in the engine compartment. Now its doing it again so I changed out the vacuum manifold but still did not fix the problem. I believe the storage tank may be cracked but don't know where its located. Any help would be greatly appreciated.

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