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vents not blowing on acceleration- 740 turbo 700 1987

My vents were doing the same thing on my 87 740 GLE B230F.
The vacuum reserve tank mounted under the front bumper was cracked. The line that connects to it comes off the intake manifold just after the throttle body. (About the same size as the brake booster line) I plugged the line as dirt was being drawn into the engine, and the vents returned to normal operation. That vacuum check valve, if you decide to get one, splices into the line a few inches from the manifold. I intend to put one on mine when I replace the tank.
Good luck






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