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Likely a 99% probability that the rubber diaphram in the vacuum servo that works the flap for the center vents is bad. Oftentimes they split on the edge in such a way that they will still (infrequently) work. Best way to check is to use a MityVac to pull a vacuum on the line to that servo a few times to see if it will hold. Access to the servo is either by removing the dash or through the glove compartment. These units frequently fail first due to heat drying out the rubber diaphrams. There are lots of threads on this topic that will tell you everything you need to know. The parts aren't that expensive but the installation can be a PIA, not hard just time consuming.
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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold
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