Greetings Ed,

Just wondering if the warm air you are getting out of your center vent is blowing out or just a trace of air movement? Reason I ask is that the rubber around the circle vent closures generally dry out over time allowing the vent to seep air out the center even when it's closed. Take a flashlight and shine into the center vents while you are in the heat mode and see if they are fully open, then switch to the defrost mode and see what they do. If the air you are getting out is not very warm, actually cool at engine operating temps, and you have the old style verticle climate control, I think we can help you adjust the temp wheel to get you back where you need to be.

Charles

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"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan