its been raining a lot the last few days and my windshield has been fogging up a lot. I knew my AC wasn't putting out any cold air when i got the car and also the on/off switch was messed up - the fan stays on all the time. But none of the other switches seem to make any difference to which way the air is directed - the only air coming out is on the side vents no matter what button i push. the fan speed button works.

Here's what i discovered to day - if i hold in the on/off button, the fan turns off; when i release the button the fan blows air on the windshield for about a second and then blows out the side vents as usual.

it's still in the 80's here so my temp setting is at its lowest. when i turn the car off, after about 30 seconds i think i can hear the heater duct direction flaps drop down.

Anyone know where i should start troubleshooting?

Thanks as always...I hope there is no limit to the number of questions i can ask, I've got a long way to go with this car!

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'87 BMW 325 convertible (162k + miles)
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Olde Towne Portsmouth, VA